Hello Yuchol, I heard you say you are not an expert and that may well be true But, you are showing and using 10 times more common sense than most of the so-called experts use, and this is from my 67 years of experience. Keep up the good work and sensible methodology. It works! MoK
Great work! For the main spindle bearing oil holes, make a pipe cleaner into a V, shove down hole, then flatten the legs. I know you put the magnets there, which is a great idea, but this will help stop any non magnetic material getting down and into the bearings. I have seen this on some old lathes I rebuilt, definitely stopped some junk!
Brilliant video series, I am super impressed with how meticulous you are to detail and how clean your work area is. Now I am inspired to go change the bearing on the headstock of my lathe, they are due for renewal. It’s a pity on so many tools and machines nowadays that one needs to spend so much time to remanufacture the parts to speck and do all the cleaning and demurring to get them to run the way they were intended. Once again, brilliant job, I really enjoy your videos.
great job Yuchol! you definitely improved your lathe in doing this overhaul job...jet should be ashamed of what they put on the market. keep us posted about the results you had with that project...please!
Jet is made under the Chinese Communist umbrella. On aleast 2 occasions I have seen Chinese lathes ran up to a high rpm , than brought to a hard stop, only to have a shaft bend in the headstock , or gearbox. One was an ann yang and the other was a jet. I have been a machinist for 40 years. Business owners will always go cheap on machines , rather than buying a good used leblonde, monarch, lodge and Shipley. These older machines you can still get parts for. Good luck with parts or technical support from anything made it China. The shame is, these business owners proudly fly an American flag in front of their business.They Don't give cost of living adjustments,employee performance reviews, etc. I am going off on a tangent now. I apologize.
Thanks for a very good instructional and assembly video. I didn't know spindle bearings were marked for runout and the importance of installing them the right way. I'm an experienced machinist and toolmaker but still learning new stuff every day. One point about precision flat stones; Illustrations always show them used dry but I've found they work much better with a light spray of WD-40. The lubricant flushes the embedded metal and grit particles to the surface and keeps the stones clean. Continue to rub together to keep them flat but lubricate lightly for better performance. You will feel the difference.
Very much enjoyed watching you go through this project Yuchol. You are very meticulous. It’s nice to see things done correctly. It’s unfortunate that JET didn’t do the same. I’m also a hobbyist, but from the opposite side of Washington in the Spokane area. Enjoy your videos, keep them coming!
Great project Yuchol, and great result (subjectively! qualitatively!) :-) Brilliant work and I love the look of the clean fresh paint and the clean gears and so on. It will pay you back for decades I think. Cheers, Craig
Great video on the rebuild. Wow, for what you found and had to fix, Jet's Quality Inspection process needs work. Especially as prod Jet is of their products. Glad to hear you added magnets in the gearbox. That helps a lot to catch wear metal. Your rebuild turned out great. Thanks for sharing.
You did a real fine job Yuchol. I know it's hard to let it go when it's not perfect, but some (inherited) imperfections are better accepted than invested in, as you've wisely concluded. Congratulations on a terrific outcome :)
Thank you for taking us along on this adventure. I really liked the explanations of what you were doing and why. All the best to you and your family!! Norm in Arizona
You sure brought me bad luck. :) About 30 days after watching your video my small 13x40 just like yours started having spindle bearing issues, like getting way tighter! But, thanks to your video, I'm not walking into it blind!
I have 3 more lathes but my 13x40 is my go to for most my small jobs. It really holds tolerances good and has been a good machine. It's an Enco, not a Jet but they look pretty similar.
Hats off to you and your channel.... that was and outstanding rebuild. I have the identical lathe only it is the Grizzly and it was getting the same way. They were about 5,000 new about 20 yrs ago. The were slapped together and shipped to the us. For the price, it has been a good machine.
I have king lathe. They have been around for the last 50 years. I have a Had good results. This lathe was no top of the line but alway come though for me. Cheers Fred
Jet is still a good brand but they have tools of every kind and so are not specialists in any one area. I think some of the tools with their brand on them are likely rebranded.
FireBlade X I think you are right. I have seen lathes of several brands that are identical.No different than Ford and Mazda pickup trucks coming off the same assembly line.
nice to see what is inside of a newer lathe, i have an old colchester and all the gears rattle and make strange noises, like some strange metal symphony, its possibly older than i but never has had a failure
Hi I'm very impressed with your work, It's important that an inferred thermometer should never be used to find the temperature of a shiny surface (a bearing in this case). It can be off many degrees, reading the reflected temp in the room instead of the surface of the part. always use a marking stick designed to melt at a specific temp of the bearing. Nice work Rich
Looks great! Love the attention to detail, satisfies my OCD as well. Having done similar on my mini lathe, it's very pleasing to get it put back together and make a cut. And that was a very beautiful cut.
Good job, and good work. How nice it is so see & hear someone who doesn’t think they know everything! New subscriber - keep up the good work thanks mate.
Opened a import 6” 3jaw last week and saw the same black crud and loose bures inside. Cleaned it up and now it goes great. 0.002” runout on a 200$ import chuck, I can live with that. Real nice build. 👍👍👍
I have a Kent 17x40. I pulled the cover off the headstock the other day and found way more metal than I would like to see. I'm going to change the oil a few times and install some additional magnets. Probably will have to replace all the bearings at some point, but don't have time right now. Mine was made in Taiwan in the late 90s, and they still sell the same machine today.
Gday Yuchol, it’s all back to better then brand new, you did a great here, at least you know what you have got now which is a good thing, the run out in the spindal is incredibly good, I wish you many happy trouble free years of machining mate, take care, Matty
Outstanding video. You have excellent work habits for this type of work. However, the initial spindle bearing adjustment should be set by measuring "Lift" at the spindle nose. Running-in bearings that are not tight enough, results in improper wear pattern.
Good job Mr. Yuchol. I just finished an old 17 x 96 inch LeBlond and am now working on a 13 x 36 inch LeBond. I have another 13 x 72 inch waiting also. Thanks for the video...
Awesome work Yuchol. You have a better than new lathe. When I went to adult school taking machining classes they had a Jet lathe and I never liked the fit and finish. It seems you should go consult with Jet and help them up their game. Such nice work.
I'm guessing that the pointy head who first determined that OCD was a disorder doesn't have as clean a shop or tooling that works as well as yours. I salute you and your OCD sir. I'm inspired by it.
Great! I have the Jet GH-1440-W and it is noisy too. I blame the motor (single phase) for most of it but now with your experiences I'm also believing that the machine is in need of a head-stock clean-up and bearing replacement as well. I must thank you for your insights on this project! I have priced all of the bearings so getting ready... I'll also be looking for one of those ape T shirts - love it! I chuckled out loud! - 7-2-24 WELL this machine was a genuine mess! At some time in its life the oil was mixed with something that wasn't compatible so the oil was brown and thick - had stained the gears and shafts... The motor also had a melted run capacitor and it was growling. I like the three phase with VFD - that's going to happen. The documentation for these machines is quite poor so anyone doing this job needs to note carefully on disassembly the sizes of spacers and etc. Your video bailed me out when I mixed the two spacers on 'D' - thanks again!!
Nicely done! The inside of that thing looks much better with the white, and any subsequent debris would be easier to see. I like the little magnets in the spindle feed wells, I think that will happen with mine next time I pop the lid and it gets serviced.
Very interesting you probably have a nice lathe for many years to come . The magnets are a great idea already working especially after you were so clean and carfull thanks for taking the time to share kind regards Shaun 😀😀
You did a fantastic job on your lathe. I was glad you re painted it. I like the little magnets, especially the ones in the recirculation channels. You were smart to stop when you did. It’s easy for me to go overboard with stuff too. My machining hobby could turn into a rebuilding Chinese machines hobby really easy if I’m not careful. Lol
That lathe sounds really nice to me! It’s just like I just put all new bearings and spindle in my Kent mill and all the old noises are gone but there are a few new noises just like your lathe! At least now I can hear myself think!
I think that the way you cleaned everything up in the headstock really added to the overall quality of the machine. These companies start with pretty decent stuff, but they’re cutting corners to meet a cost target. It’s a pity, because the basics are there to produce a really good hobby lathe. That white paint job really shows off the internal parts, which again just need a bit more care and attention. By doing this restoration, you now have a much better lathe. I will be checking the spindle bearings in my lathe. I have always felt there was something not right and suspected there wasn’t enough preload. One thing that seemed odd was that I can gear the spindle bearings make a noise like a rollerblade wheel that needs new bearings. I’ve never heard that noise on other lathes. Maybe the preload isn’t high enough and maybe they’re just shot. I’ve never bothered with them before, but I’m soon going to be doing gunsmithing work that requires high precision. Now that I’ve read enough and watched some very helpful videos, I know how to set the preload correctly.
Yuchol, I'm impressed mate. Job well done. I thought I recognised a bit of O.C.D. My eldest daughter(28y/o) has it. When it comes to machinery, a little O.C.D. is a good thing, if you know what I mean. Cheers from Australia.
Thanks for your video, very educational. I have the same problem with broken chinese bearings (broken ball cage) due to manufacturing chips in the headstock. I admire your accuracy.
Hello Yachol You did an outstanding job on the bearing replacement. Enjoyed The video nice end with those magnets They will help you big time they'll catch the smallest particles. So you don't have to do a rebuild for long time. Cheers Fred
Good job. I enjoy your channel and this deep dive into...not sure what, exactly, maybe coping. Coping is a tremendously important skill. Now might be a good time to quantitatively baseline the machine: noise db at two or three different speeds, runouts at several different distances of projection, surface finish under a set of precisely defined conditions. Then put that away, enjoy the lathe for the next year, then retest and see how much has changed. Good luck, good journey.
Great job, thanks for your time to share this. I have 2 lathes that I will be going through. And a big 👍 for pointing out about the new bearings have the marks for the run out.
Hi, your both videos are simply superb. You have done a fantastic work. Congratulations and thank you very much for sharing. Best regards from Switzerland.
I watched your video of you reassembling the headstock of your lathe & you were talking about the low quality of machined parts . to deburr the lock ring or any other I.D. / O.D. CRATEX makes a rubberized abrasive in different grits , in wheels & sticks that are VERY versatile !!!! The smallest discs are only 3/8 of an inch in diameter ( 0.375 ) . You can get these on Ebay for a reasonable cost These can be used with a die grinder or Dremel tool . MSC carries them but you'll get a better price on Ebay . NICE video , Good job , thank you for reading my comment , no need to reply to this comment sincerely B. Fox
With a D1-4 chuck you have 4 chuck positions to check run out on your ground rod... Never know which is the least till you measure... Then mark the assembly to reinstall the same... Nice job on your spindle rebuild...
A very interesting project I am not sure that I have the patience to do it with my lathe I just put head phones on and go for it. My lathe is a MetalMaster 300 mm x 900 mm or in your speak 12 in x 36 in made in the land of way to many people and it is noisy so may be one day I will er-build it. A great video and very informative.
Enjoyed, I'm sure my lathe could use the same do over. So be expecting a shipment! Great job with the upgrade and the video. Keep um coming. Thanks again.
David they do break when my 3 year old daughter was playing in the workshop, she had engaged the half nuts without me knowing. I always move the saddle towards the tail stock end when not using and equalise wear on the bed. Switching on the lathe in the morning and engaging clutch heard a horrible noise, the saddle had come up against the leadscrew, feed shaft support block and ensueing damage two stripped gears in the feed gearbox.The previous owner had substituted a hardened steel roll pin instead of a shear pin on the lead screw coupling.As you know the feed shaft is protected with a ball clutch.
That lathe sounds excellent. ive run them with bad bearings and gears, you don't have to worry about that gearbox for a longgggg time. magnets are a must.
Great work! I'm glad for you that you were able to save so much money on bearings, wow, big savings! 2/10ths..... not bad at all! I could live with that :) Thanks for sharing this very informative rebuild! Much appreciated! :)
While I haven’t done this for a long time, people should be aware, before doing this themselves, that it’s a lot more work (and frustration) than he’s making it seem. One problem with using magnets to catch chips is that they don’t catch non ferrous metals, plastic, etc. A lot of people are using them, but be aware of that.
Relatively new subscriber here but I've been going thru all your videos over the past couple of weeks. Its unfortunate that Jet cut so many corners, but you did really good. Hopefully this machine will give you years of trouble free service. They aren't like the old US iron LOL. I think your headstock gearing best compares to the power feed gearing on my Monarch 12CK. The headstock gearing in those machines is massive. But I can't imagine what it would cost to build it today. Keep up the good work.
Really nice job! I hope this machine provides many years of service. If I was Jet, I'd reimburse you for the bearings at least. Hope they see this. Of all the places you wouldn't want metal swarf...it would be inside your head stock. Oy. Oh...I have the same precision ground stones. They are awesome.
Great job, Yuchol! Pity that Jet put out such rough work. But if you ask me, she's sounding really good from where I'm sitting 🙂. You'll be wary for a month or so, every sound will launch a full scale investigation, you may wake up in a cold sweat for a few nights initially, yelling " FIRE! ". But eventually, the overwhelming awesomeness of having a lathe will take over and all will be well. In the meantime though, I'd put my therapist on speed dial 😉. Thanks for sharing! Cheers! 😁
I'm proud of have watched this video ,although as you said you´re not an ¨expertise¨,the whole job was very professional ,qualified,i´m going to take example...........
A hotwater bottle or Ice pack can be handy, just a small difference in diameter can help. 1980s my father heated one with a torch in the blacksmiths shop and in his haste he picked it up with his fingers ;-(( - One time he repaired a gearbox for a fire engine that was in 16 pieces with breaks across where the bearing should be, we used special cast iron stick rods and took our time to prevent the cast cracking on cool down on the warm forge. When he finished he could turn over the gear box by hand ;-) but it did squeak a bit ? - They could not get a replacement box; they hit a rock while on a shout in a quarry is what broke the casting. John
Very nice job it’s always better to be over the top cleAning than to be lazy and 6 months down the line your back to square one replacing bearings due to grit and swarf damaging the races great job thoroughly enjoyed watching mate god bless stay safe and healthy I’m a new subscriber 👍🙏🏻
Very well done! You did a very fine job and you improved your lathe. Bravisimo! Thanks for sharing. Guess Randy kept you on course, guess you could say he helped you keep your bearings. Lol 😉
@@woodscreekworkshop9939 Some deburring and assembling parts in a clean manner can make a world of difference. Nice video by the way, alot of good information.
A difficult job well done, I don't know how you remebered where everything went. Its a good job when you have no parts left at the end like a washer or circlip. Well done. A glass top would make all the work more apreciable 😊 pity its all hidden.
Yuchol, watch a video from Watch Wes Work on Aug 15 2017 , he does a great job of explaining headstock rebuild on a lathe. He also explains how to measure front bearing to cover clearances. His lathe cover and bearing had improper clearances with the new bearing. This is important to see that the cover exerts the proper pressure on the bearing race. His new front bearing did not match the front cover clearances even though it was the proper bearing . Check it out as I did not see you measure any clearances.
The bearings that Wes was installing on his lathe were tapered on the inner ring, the front one at least i can't remember if the back one was tapered inner ring design, and that's why he had to measure cover thicknesses etc. to obtain the proper radial preload on the bearings. Yuchol's spindle bearings seem to be just two tapered roller bearings with cylindrical inner and outer rings and such bearings get preloaded with the ring nut on the back bearing.
Outstanding job Yuchol, I don’t see how anyone could do a more meticulous approach-Well Done ✅
Thanks Michael as always!
Hello Yuchol, I heard you say you are not an expert and that may well be true But, you are showing and using 10 times more common sense than most of the so-called experts use, and this is from my 67 years of experience. Keep up the good work and sensible methodology. It works! MoK
Thank you 🙏🏼
I think you deserve a medal. This was a deeply thoughtful, professional, video that clearly resulted in a vastly improved product. Happy lathing!
Thanks a lot Brad!
Great job Yuchol. I admire your tenacity to do an excellent job on all details of a project. Thanks for taking us along and take care.
Thanks, Yuchol. That was a worthwhile project and I'm pretty sure you've reset your lathe's lifetime back to better than new.
Thanks Richard!
Great work! For the main spindle bearing oil holes, make a pipe cleaner into a V, shove down hole, then flatten the legs. I know you put the magnets there, which is a great idea, but this will help stop any non magnetic material getting down and into the bearings. I have seen this on some old lathes I rebuilt, definitely stopped some junk!
You started out with the goal to make it better, and you definitely accomplished that. Your lathe is better than ever now. Nice job.
Thanks Charlie
Yuchol, you did a superb job. I am getting ready to do the same to my lathe watching you gives me confidence in the process. Thanks for this
I enjoyed this video, and I am glad to know I am not the only one that has OCD about things like this. Excellent job.
Very informative! There’s a lot of things I didn’t know about bearings that you talked about. Thank you!
Glad to help!
Brilliant video series, I am super impressed with how meticulous you are to detail and how clean your work area is. Now I am inspired to go change the bearing on the headstock of my lathe, they are due for renewal. It’s a pity on so many tools and machines nowadays that one needs to spend so much time to remanufacture the parts to speck and do all the cleaning and demurring to get them to run the way they were intended. Once again, brilliant job, I really enjoy your videos.
Conrad Greer thanks Conrad for your kind words
I have been eagerly awaiting when this lathe was running, great job as always. Thank you for letting us join the journey.
Thanks Carl, glad you found it interesting
Very nicely done Yuchol. I think it will work. Monitor and adjust after you use it for awhile. Great job.
Thanks Randy. If I was having another kid, I'd name him after you, but you're safe.
@@woodscreekworkshop9939 Nice, Yohaun is a nice name.
great job Yuchol! you definitely improved your lathe in doing this overhaul job...jet should be ashamed of what they put on the market. keep us posted about the results you had with that project...please!
Thank you so much!
Jet is made under the Chinese Communist umbrella. On aleast 2 occasions I have seen Chinese lathes ran up to a high rpm , than brought to a hard stop, only to have a shaft bend in the headstock , or gearbox. One was an ann yang and the other was a jet.
I have been a machinist for 40 years. Business owners will always go cheap on machines , rather than buying a good used leblonde, monarch, lodge and Shipley.
These older machines you can still get parts for. Good luck with parts or technical support from anything made it China.
The shame is, these business owners proudly fly an American flag in front of their business.They Don't give cost of living adjustments,employee performance reviews, etc. I am going off on a tangent now. I apologize.
Outstanding! Thank you for sharing such quality practice while remaining humble and honest. Job well done!
Thanks Travis
Thanks for a very good instructional and assembly video. I didn't know spindle bearings were marked for runout and the importance of installing them the right way. I'm an experienced machinist and toolmaker but still learning new stuff every day. One point about precision flat stones; Illustrations always show them used dry but I've found they work much better with a light spray of WD-40. The lubricant flushes the embedded metal and grit particles to the surface and keeps the stones clean. Continue to rub together to keep them flat but lubricate lightly for better performance. You will feel the difference.
Very much enjoyed watching you go through this project Yuchol. You are very meticulous. It’s nice to see things done correctly. It’s unfortunate that JET didn’t do the same. I’m also a hobbyist, but from the opposite side of Washington in the Spokane area. Enjoy your videos, keep them coming!
Thanks Mike 👍🏼
Great project Yuchol, and great result (subjectively! qualitatively!) :-) Brilliant work and I love the look of the clean fresh paint and the clean gears and so on. It will pay you back for decades I think. Cheers, Craig
Thanks Craig!
The damaging chips you had remind me with "The enemy from within". Good job and description. special thanks to you & Randy Richard.
Thanks
Great video on the rebuild. Wow, for what you found and had to fix, Jet's Quality Inspection process needs work. Especially as prod Jet is of their products. Glad to hear you added magnets in the gearbox. That helps a lot to catch wear metal. Your rebuild turned out great.
Thanks for sharing.
You did a real fine job Yuchol. I know it's hard to let it go when it's not perfect, but some (inherited) imperfections are better accepted than invested in, as you've wisely concluded. Congratulations on a terrific outcome :)
Thanks Steve, it’s better to address the problem than whine about it (which I did a bit of) 😁
Thank you for taking us along on this adventure. I really liked the explanations of what you were doing and why.
All the best to you and your family!!
Norm in Arizona
Thank you Norm
I don't even own a lathe and watched this beginning to end. You made a great video.
Great job! Thanks for taking the time to document this. I'm sure others will find it helpful if they need to replace bearings in their headstocks!
You sure brought me bad luck. :) About 30 days after watching your video my small 13x40 just like yours started having spindle bearing issues, like getting way tighter! But, thanks to your video, I'm not walking into it blind!
I have 3 more lathes but my 13x40 is my go to for most my small jobs. It really holds tolerances good and has been a good machine. It's an Enco, not a Jet but they look pretty similar.
I am sure you will take good care of it 💪🏼
Hats off to you and your channel.... that was and outstanding rebuild. I have the identical lathe only it is the Grizzly and it was getting the same way. They were about 5,000 new about 20 yrs ago. The were slapped together and shipped to the us. For the price, it has been a good machine.
Thanks
That lathe came out beautiful. That headstock sounds very smooth. Every bit as good as some austrian enco lathe. Wonderful.
I believe you mean Emco.
Great job.OCD is beneficial when doing a job like that.Too bad that Jet didn’t do the job right in the first place.
Right!
You get what you pay for.
I have king lathe. They have been around for the last 50 years. I have a
Had good results. This lathe was no top of the line but alway come though for me.
Cheers Fred
Jet is still a good brand but they have tools of every kind and so are not specialists in any one area. I think some of the tools with their brand on them are likely rebranded.
FireBlade X I think you are right. I have seen lathes of several brands that are identical.No different than Ford and Mazda pickup trucks coming off the same assembly line.
nice to see what is inside of a newer lathe, i have an old colchester and all the gears rattle and make strange noises, like some strange metal symphony, its possibly older than i but never has had a failure
Hi I'm very impressed with your work, It's important that an inferred thermometer should never be used to find the temperature of a shiny surface (a bearing in this case). It can be off many degrees, reading the reflected temp in the room instead of the surface of the part. always use a marking stick designed to melt at a specific temp of the bearing.
Nice work
Rich
Looks great! Love the attention to detail, satisfies my OCD as well. Having done similar on my mini lathe, it's very pleasing to get it put back together and make a cut. And that was a very beautiful cut.
Thanks David! 🙏🏼
Excellent job !. Regards from the UK.Wise words from Randy Richard by the way , sometimes perfection is unobtainable all the time !.
Good job, and good work. How nice it is so see & hear someone who doesn’t think they know everything! New subscriber - keep up the good work thanks mate.
Well done Yuchol, expert or not. Thank you!
Opened a import 6” 3jaw last week and saw the same black crud and loose bures inside. Cleaned it up and now it goes great. 0.002” runout on a 200$ import chuck, I can live with that. Real nice build. 👍👍👍
Glad you got the chuck going 👍🏻
I have a Kent 17x40. I pulled the cover off the headstock the other day and found way more metal than I would like to see. I'm going to change the oil a few times and install some additional magnets. Probably will have to replace all the bearings at some point, but don't have time right now. Mine was made in Taiwan in the late 90s, and they still sell the same machine today.
That is a nice lathe, worth some elbow grease for sure 👍🏻💪🏻
Gday Yuchol, it’s all back to better then brand new, you did a great here, at least you know what you have got now which is a good thing, the run out in the spindal is incredibly good, I wish you many happy trouble free years of machining mate, take care, Matty
Hi Matty.
Thanks Matty for all emotional support!
Outstanding video. You have excellent work habits for this type of work.
However, the initial spindle bearing adjustment should be set by measuring "Lift" at the spindle nose. Running-in bearings that are not tight enough, results in improper wear pattern.
I'm certain you'll be taking it apart some more and making improvements.
Good job Mr. Yuchol. I just finished an old 17 x 96 inch LeBlond and am now working on a 13 x 36 inch LeBond. I have another 13 x 72 inch waiting also. Thanks for the video...
Wow, you got a lot of work ahead of you, good luck!
Great work Yuchol.....You more than likely made the lathe sound the way it should have when it was designed. Cheers...Wayne
Thanks Wayne!
Awesome work Yuchol. You have a better than new lathe. When I went to adult school taking machining classes they had a Jet lathe and I never liked the fit and finish. It seems you should go consult with Jet and help them up their game. Such nice work.
Dudley Toolwright thanks Robert. I haven’t received an email from Jet yet 🤷🏻♂️
I'm guessing that the pointy head who first determined that OCD was a disorder doesn't have as clean a shop or tooling that works as well as yours. I salute you and your OCD sir. I'm inspired by it.
Ah, thanks!
Great point machinehead :)
Great! I have the Jet GH-1440-W and it is noisy too. I blame the motor (single phase) for most of it but now with your experiences I'm also believing that the machine is in need of a head-stock clean-up and bearing replacement as well. I must thank you for your insights on this project! I have priced all of the bearings so getting ready... I'll also be looking for one of those ape T shirts - love it! I chuckled out loud! - 7-2-24 WELL this machine was a genuine mess! At some time in its life the oil was mixed with something that wasn't compatible so the oil was brown and thick - had stained the gears and shafts... The motor also had a melted run capacitor and it was growling. I like the three phase with VFD - that's going to happen. The documentation for these machines is quite poor so anyone doing this job needs to note carefully on disassembly the sizes of spacers and etc. Your video bailed me out when I mixed the two spacers on 'D' - thanks again!!
Nicely done! The inside of that thing looks much better with the white, and any subsequent debris would be easier to see. I like the little magnets in the spindle feed wells, I think that will happen with mine next time I pop the lid and it gets serviced.
Very interesting you probably have a nice lathe for many years to come . The magnets are a great idea already working especially after you were so clean and carfull thanks for taking the time to share kind regards Shaun 😀😀
Thanks Shaun!
You did a fantastic job on your lathe. I was glad you re painted it. I like the little magnets, especially the ones in the recirculation channels. You were smart to stop when you did. It’s easy for me to go overboard with stuff too. My machining hobby could turn into a rebuilding Chinese machines hobby really easy if I’m not careful. Lol
Thanks, it’s working well now
That lathe sounds really nice to me! It’s just like I just put all new bearings and spindle in my Kent mill and all the old noises are gone but there are a few new noises just like your lathe! At least now I can hear myself think!
Don’t do too much thinking, it hurts 😁
I think that the way you cleaned everything up in the headstock really added to the overall quality of the machine. These companies start with pretty decent stuff, but they’re cutting corners to meet a cost target. It’s a pity, because the basics are there to produce a really good hobby lathe. That white paint job really shows off the internal parts, which again just need a bit more care and attention.
By doing this restoration, you now have a much better lathe.
I will be checking the spindle bearings in my lathe. I have always felt there was something not right and suspected there wasn’t enough preload. One thing that seemed odd was that I can gear the spindle bearings make a noise like a rollerblade wheel that needs new bearings. I’ve never heard that noise on other lathes. Maybe the preload isn’t high enough and maybe they’re just shot. I’ve never bothered with them before, but I’m soon going to be doing gunsmithing work that requires high precision. Now that I’ve read enough and watched some very helpful videos, I know how to set the preload correctly.
Yuchol, I'm impressed mate. Job well done. I thought I recognised a bit of O.C.D. My eldest daughter(28y/o) has it. When it comes to machinery, a little O.C.D. is a good thing, if you know what I mean. Cheers from Australia.
Thanks for your video, very educational. I have the same problem with broken chinese bearings (broken ball cage) due to manufacturing chips in the headstock.
I admire your accuracy.
Thank you
Hello Yachol
You did an outstanding job on the bearing replacement. Enjoyed
The video nice end with those magnets
They will help you big time they'll catch the smallest particles. So you don't have to do a rebuild for long time.
Cheers Fred
Than’ you so much Fred 🙏🏻
I bet you are glad that's back together ! Great job .
I am glad, thanks Max 😃
Another reason why Dean Smith and Grace lathes are best. They never break.
Too bad we don’t see a lot of those here in Canada.
I'd be happy with that.
You have to be disappointed with the lathe but now you know what you got.
Good bearings, clean installation. I feel good!
I feel good about it, thanks Jeff!
Yuchol, really good work. I am adding a auxiliary electric oil pump to pre lube all the bearings.
Sounds good! Thanks.
Good work Yuchol
I did not know about indicator marks. Thanks for sharing
TommyGun Machining thanks Tommy!
Just what the doctor ordered! Top work, Yuchol! Greetings from Chicago...
Thanks Matthew!
Loved all the info. When the magnets went in...OMG. loved it.
Good job. I enjoy your channel and this deep dive into...not sure what, exactly, maybe coping. Coping is a tremendously important skill.
Now might be a good time to quantitatively baseline the machine: noise db at two or three different speeds, runouts at several different distances of projection, surface finish under a set of precisely defined conditions. Then put that away, enjoy the lathe for the next year, then retest and see how much has changed. Good luck, good journey.
Josh Drexler thanks Josh 🙏🏻
Great job, thanks for your time to share this. I have 2 lathes that I will be going through. And a big 👍 for pointing out about the new bearings have the marks for the run out.
Fantastic work. Impressive attention to detail.
Salah Zenieh thanks
Hi, your both videos are simply superb. You have done a fantastic work. Congratulations and thank you very much for sharing. Best regards from Switzerland.
Thank you Tito for your kind words 🙏🏼
Only 900 or so likes? You deserve many more!
great job - I've repaired many straight drive automotive transmissions but this thing was far more complicated
Thanks Ken!
Very nice job, an absolute ton of work and you taped it as well, very impressive, cheers!
Thanks, it was a lot of work!
Excellent project. I have a very similar Clark 14"X 40" and intend to use your video as a bit of a guide. Thanks for the content!
Glad it was helpful!
Beautiful job! You inspired me to take another look at some clatter in my mill spindle.
Do it! It will only get worse if you ignore 😁
Great job and super great sense of humor chinggu!!!!
Thanks and back at you my friend 👍🏼
I watched your video of you reassembling the headstock of your lathe & you were talking about the low quality of machined parts . to deburr the lock ring or any other I.D. / O.D. CRATEX makes a rubberized abrasive in different grits , in wheels & sticks that are VERY versatile !!!! The smallest discs are only 3/8 of an inch in diameter ( 0.375 ) . You can get these on Ebay for a reasonable cost These can be used with a die grinder or Dremel tool . MSC carries them but you'll get a better price on Ebay . NICE video , Good job , thank you for reading my comment , no need to reply to this comment sincerely B. Fox
Thanks Byron. 🙏🏻
With a D1-4 chuck you have 4 chuck positions to check run out on your ground rod... Never know which is the least till you measure... Then mark the assembly to reinstall the same... Nice job on your spindle rebuild...
Yeah, there is a zero mark and the chuck, and backplate are all aligned to that. I also used that mark to place the bearing runout markings
A very interesting project I am not sure that I have the patience to do it with my lathe I just put head phones on and go for it. My lathe is a MetalMaster 300 mm x 900 mm or in your speak 12 in x 36 in made in the land of way to many people and it is noisy so may be one day I will er-build it. A great video and very informative.
Thanks David!👍🏼
Enjoyed, I'm sure my lathe could use the same do over. So be expecting a shipment! Great job with the upgrade and the video. Keep um coming. Thanks again.
Thanks Jerry!
David they do break when my 3 year old daughter was playing in the workshop, she had engaged the half nuts without me knowing.
I always move the saddle towards the tail stock end when not using and equalise wear on the bed.
Switching on the lathe in the morning and engaging clutch heard a horrible noise, the saddle had come up against the leadscrew, feed shaft support block and ensueing damage two stripped gears in the feed gearbox.The previous owner had substituted a hardened steel roll pin instead of a shear pin on the lead screw coupling.As you know the feed shaft is protected with a ball clutch.
Yikes!
That lathe sounds excellent. ive run them with bad bearings and gears, you don't have to worry about that gearbox for a longgggg time.
magnets are a must.
Ah, thanks so much 🤠
@@woodscreekworkshop9939 Lovely video btw, excellent work :)
Good job Yusol, like the small magnets, going to take my headstock cover off and do the same.
It sounds like a good idea but why not put a fine mesh metal screen over it?
@@brandontscheschlog If that screen clogs up the bearing will fail, possibly seize. So not a good idea to put in a screen of any kind.
Nicely planned and executed!
Thanks Stan, I am happy with the outcome!
Thanks for a very good video. I have not seen anyone do this subject and I learned a lot.
Glad you enjoyed it!
Great work!
I'm glad for you that you were able to save so much money on bearings, wow, big savings!
2/10ths..... not bad at all! I could live with that :)
Thanks for sharing this very informative rebuild!
Much appreciated! :)
Great job Yuchol. Nothing wrong with being OCD. You'll be able to do a Roadranger Gearbox no worries hehe.
Graham O'Keeffe. 😆
Great job Yuchol.....it's good for the long haul now...
Thank you!
While I haven’t done this for a long time, people should be aware, before doing this themselves, that it’s a lot more work (and frustration) than he’s making it seem.
One problem with using magnets to catch chips is that they don’t catch non ferrous metals, plastic, etc. A lot of people are using them, but be aware of that.
Quite the undertaking. Well done! Thanks for sharing!
Cheers from Canada
Thank you
Relatively new subscriber here but I've been going thru all your videos over the past couple of weeks. Its unfortunate that Jet cut so many corners, but you did really good. Hopefully this machine will give you years of trouble free service. They aren't like the old US iron LOL. I think your headstock gearing best compares to the power feed gearing on my Monarch 12CK. The headstock gearing in those machines is massive. But I can't imagine what it would cost to build it today. Keep up the good work.
You’re right, I wish I can find me a good old iron, but not common out where I am. Thanks for your kind words!
Great job well done. I’m disappointed a new Jet lathe would have these types of problems. OCD used to be called perfectionist which I prefer.
Thanks Cyrus. We all need to take more pride in our work. 👍🏻
Really nice job! I hope this machine provides many years of service. If I was Jet, I'd reimburse you for the bearings at least. Hope they see this. Of all the places you wouldn't want metal swarf...it would be inside your head stock. Oy. Oh...I have the same precision ground stones. They are awesome.
Thanks! 👍🏼
They don’t care
Really good set of videos. Thanks for doing this.
Thank you Matt 🙏🏻
Great job, Yuchol! Pity that Jet put out such rough work. But if you ask me, she's sounding really good from where I'm sitting 🙂. You'll be wary for a month or so, every sound will launch a full scale investigation, you may wake up in a cold sweat for a few nights initially, yelling " FIRE! ". But eventually, the overwhelming awesomeness of having a lathe will take over and all will be well. In the meantime though, I'd put my therapist on speed dial 😉. Thanks for sharing! Cheers! 😁
I know! I'm sure I'll be jumpy for awhile
Exelente trabajo amigo yo también e realizar ésos trabajo de varias marcas de torno y me gusta como haces los trabajos buen video
Thank you 🙏🏻
I'm proud of have watched this video ,although as you said you´re not an ¨expertise¨,the whole job was very professional ,qualified,i´m going to take example...........
A hotwater bottle or Ice pack can be handy, just a small difference in diameter can help.
1980s my father heated one with a torch in the blacksmiths shop and in his haste he picked it up with his fingers ;-((
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One time he repaired a gearbox for a fire engine that was in 16 pieces with breaks across where the bearing should be, we used special cast iron stick rods and took our time to prevent the cast cracking on cool down on the warm forge. When he finished he could turn over the gear box by hand ;-) but it did squeak a bit ?
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They could not get a replacement box; they hit a rock while on a shout in a quarry is what broke the casting.
John
Yikes!
Loved it Yuchol .Great job , I hope Lance and Patrick were not watching. Patrick would pass out . take care pal, Cheers Ade.
I know, they would freak out. Thanks Ade!
Very nice job it’s always better to be over the top cleAning than to be lazy and 6 months down the line your back to square one replacing bearings due to grit and swarf damaging the races great job thoroughly enjoyed watching mate god bless stay safe and healthy I’m a new subscriber 👍🙏🏻
Thank you 🙏🏼
Very well done! You did a very fine job and you improved your lathe. Bravisimo! Thanks for sharing. Guess Randy kept you on course, guess you could say he helped you keep your bearings. Lol 😉
I see what you did there :)
Great video. I love the music :) Do you think it would be feasible to make a crude lathe gearbox out of a motorcycle gearbox?
Nice job Yuchol, you should have a smoother running and longer lasting lathe.
I hope so Andy!
@@woodscreekworkshop9939 Some deburring and assembling parts in a clean manner can make a world of difference. Nice video by the way, alot of good information.
A difficult job well done, I don't know how you remebered where everything went. Its a good job when you have no parts left at the end like a washer or circlip. Well done. A glass top would make all the work more apreciable 😊 pity its all hidden.
Thanks Derek. I was happy to not see any extra left over parts myself 😁
Yuchol, watch a video from Watch Wes Work on Aug 15 2017 , he does a great job of explaining headstock rebuild on a lathe. He also explains how to measure front bearing to cover clearances. His lathe cover and bearing had improper clearances with the new bearing. This is important to see that the cover exerts the proper pressure on the bearing race. His new front bearing did not match the front cover clearances even though it was the proper bearing . Check it out as I did not see you measure any clearances.
The bearings that Wes was installing on his lathe were tapered on the inner ring, the front one at least i can't remember if the back one was tapered inner ring design, and that's why he had to measure cover thicknesses etc. to obtain the proper radial preload on the bearings. Yuchol's spindle bearings seem to be just two tapered roller bearings with cylindrical inner and outer rings and such bearings get preloaded with the ring nut on the back bearing.
I watched his, slightly different design. Thanks.
great job!
liked that you repainted it!
Thanks Chris!
Very nice job, congratulations. I wish you a good day. John
Thank you John!