(40) Precision HOIST Pins Machined From 4140-HT Steel / RUSH JOB!!! Part 1- MSFN
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- Опубліковано 30 вер 2024
- SERIES LINKS:
PART 2: • (40) Precision HOIST P...
PART 3: • (40) Precision HOIST P...
This is Part 1. Manufacturing (40) Precision Hoist Pins From Raw 4140 Stock for a Rush Job To Be Completed in Just 2.5 Days. Lotsa Problems, mainly due to a poor order of operations that I blame on myself. JOIN ME!
Lots of quality machining footage in this series and my thought process to complete the job…hope you enjoy! Please subscribe and click the notifications “bell” to get notified of newly released videos. Thanks for Watching!
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SERIES LINKS:
PART 2: ua-cam.com/video/k_5FLNF9JYI/v-deo.html
PART 3: ua-cam.com/video/L2hguoNZUqw/v-deo.html
At 12 minutes.... doesn't happen turning away from the chuck. Also you wouldn't have to stop the feed and finish by hand. Hey Richard try it one time...... It has many advantages I don't understand why everyone's not doing it. 🤔
Wait for part 2 or 3....it was you who saved myass once I remembered you turning away from the chuck. Your channel will be getting a huge plug soon once I get the footage edited David :-)
BTW, If it wasnt for your videos I would NOT have met my deadline...thanks my friend!!!!
This is a brilliant video that many people starting off to operating a lathe should definitively watch !!
To appreciate and show the machine with the upmost respect, or else…..
I know I didn’t , and that swarf is what brought on my redemption
Thanks for watching & commenting
Is taking a deeper cut then .010" maxing out your lathe? Need to activate that chip breaker. Good luck and watch out for those flying chips!! Lol
currently .010-.012 per pass DOC under the current cutter geometry (.020-.025 off DIA), as time passes I improve on that tremendously....stay tuned for part 2
Those chips would make pretty pattern steel knife blades. Look like you need a good face shield while working lol
I had to put one on for most of the 2 days Rodney
@@MakinSumthinFromNuthin i bought me one. Got tired of grinder dust and sparks.
I have a pair of long-nose Needle Nose Pliers I use constantly to pull strings off the machine and toss them away from the chuck.
Working in the shop is always fun until you get a short deadline. That always seems to suck most of the fun out of it for me. Hope you made the deadline, and I hope you didn’t get hurt trying to meet that deadline with all those stringy chips whipping around. Stay safe! Chris
I didnt have time time for filming, but love sharing the projects with viewers
You are learning but jobs like these are good for that. :-)
School of hard knocks on this one :-)
Makin Sumthin From Nuthin
I'm not sure if I misunderstood you saying you can't take a cut bigger than 10 thou.Whether because you can't get it to chip or the machine can't handle it.Such a small depth of cut shouldn't be a problem on any lathe given the diameter of the work piece.As a machine shop owner 4140 is one of my favourite materials to machine always gives good finish as long as you don't let the tool rub for long at the end of the cut against the shoulder which can work harden the material.From what I can see your main problem is the chip breaker on the insert you are using it's too wide not suited for very small cuts need a tighter chip breaker for shallow and finishing cuts.Also it's not a good practice to pre- drill hole in material you need to turn which as you say creates interrupted cutting and not ideal for carbide inserts.If your spindle bore is large enough to fit that size bar it's always quicker to use long enough bar that wont cause machine to shake or material to whip, for instance enough material to do 5 pieces in this case plus parting allowance and an inch or so to hold the last piece.This way you can completely turn each part and part off and once you finish turning them all you can put the pin head inside the chuck cavity which should fit without a problem looking at the size of the pin,pull it outwards against the jaw as a stop and machine or part off the bit on the end with centre hole.Now you should drill the hole.As they say practice makes perfect.
I realized towards the end of the job the SFM using the carbide available at the time was too low preventing a deeper DOC when I first started out with the 4140. The Combination of nose radius, chip breaker, DOC etc. were all were against me when I first began. Once the lathe speed doubled it was "relatively smooth sailing" although I never did figure out how to actually break a chip. But I got thru the job on time and even tho I struggled. The stock was 1.125, my spindle bore is .750
Some challenges for sure Richard - not the friendliest of material too in a smaller size shop. I tend to get those stringy chips with 10-45 too.
As Dave mentions (User) turning away from chuck can be useful. Look fwd to part 2. :)
Yes Chris, wasnt friendly at all. Beautiful steel to work with however, surface finish is glass smooth unlike mild 1018 or A36. I had to earn this one
I am sure there is stuff out there that may have helped, I am no expert at carbide either
I also am not fully familiar with all options but, so much can depend on material, feeds and speeds etc - if there is an integral chip breaker profile then tip radius too can be a factor for it to work. Sometimes experimentation can be useful!
Man, those chips... I never touch them barehanded unless it's self defense. Like fighting a dog, you are GONNA get bit. Glad you didn't lose a finger....
no fingers, just blood at times....LOL
You need to make a chip hook. Great quick project. I don't have one myself. What happened when you took more than .010? Seems like .050 would be reasonable. I don't have any of that allow to try out.
At 1200 RPM I cound take off much more than .010. Sure was a learning experience. At 600 the tool "pushed off" at 1200 & highest feed rate it "cut". I did beat up the lathe and my brass nuts a bit I confess
I have used a 4140 annealed (not the Half Temper/Heat Treated/High Tensile you are using) a few times and find that it really seems to want high speeds and feeds. I have had decent luck with 1100 rpm and 0.014"/rev. However, I am novice so take my recommendations with a grain of salt. I really like the explanation of your thought processes and that you even show mistakes. Very nice.
Get yourself the longest pair of needle nose pliers you can find, to pull the stringy chips out and pull the chips out at the end of each cut. CrMo likes as much speed as you can give it and as the speed comes up I was able to take a much deeper cut than when I was trying to cut at my normal cutting speeds.
Thanks RJM......The job went MUCH smoother at the higher RPM even tho the stringy chips were still an issue. I never cut 4140 before...or ran above 685 RPM. Towards end of the job at 1270 RPM I was able to take .020-.025 per pass rather than .010 at lower speeds. Was quite the learning curve...for me at least
looks like pins for elevator chains we used in the mine
i would have been cussing more then that lol
LOL
ohhhh, I was brother
Same here. All I heard was "ow" from Rich. Hope you're healed from 'first blood'.
Bison Workshop - But the cussin' doesn't get the job done any sooner.
the power of "editing" :)
I forge a lot of 4140 , 2” round . Not the easiest stuff to machine. I go through plenty of insets .
The cross drilled hole chipped a number of them. Yep, 4140.....tuff stuff!
Felt the burnt blood right through the screen.
At 8.25 8.30 that doesn't happen too Richard 😉 towards the tailstock. Looking forward to part 2.. 3..
Use a parting tool to under cut the hole close to finish diameter then hog the rest without the intermittent cut.
The hole was a huge mistake, that is an excellent idea btw, wish I thought of it at the time
Love your videos. I am always learning something new. Thanks for sharing. Very informative and a great teacher.
Thanks!!
Enjoyed man on to part 2 ..
You have time to video this?
Wonder what would happen if you turned away from the chuck?
watch part 2 :)
A Rush Job ? Well Here's Another Fine Mess You've Gotten Us Into !!! I'm Right There With You Man !!! I'm In The Front Row Of The Cheering Section......Go Rich Go Rich
I need to talk to the boss about these unreasonable deadlines
Makin Sumthin From Nuthin No Kidding !!! But It Is Good For The Rest Of Us , If I'm Not Mistaken This Is Three Vid's In Less Than A Week !!!!!!!!!!!!!!!!!!!!!!!!!!
your chips are awful
It is always good to be wise after the event - like you, I just wish I could foresee these problems before, Good Luck with it all
Was my inexperience shining in the spotlight. Should have never drilled that hole prior to turning to diameter
Makin Sumthin From Nuthin - Sooner or later, everyone gets one wrong!! Don't beat yourself up......anymore than the chips did.
4140 is cromoly right I here that stuff is very hard to work with good work as always .
hard as #$%* LOL
lol
bastard chips!
Carbide inserts do not like interrupted cuts. Also, when you start getting the long razor wire swarf, try changing your feed speed, spindle RPM's and/or your depth of cut. By playing with these, you can usually get rid of it. You needed a bigger lathe for this project taking .300" off. I would have taken it in 4-5 cuts....... LOL
I hate the word RUSH
I tried every speed and feed rate I had....the 4140 whipped me.......LOL
I over-promised....but delivered! LOL
That is the important part Richard, you delivered. We learn from every job we do. Sometimes the lessons are more important than others. I know it is hard to say no but sometimes our pride prevents us from saying "I don't think I can handle this one". Been there and done that numerous times.
Makin Sumthin From Nuthin - Now that is a mark of a man's true character. Working you butt off under difficult conditions to deliver the product, within specs and on time, as promised.
Thanks Vernon....was a new client
Dangerous job. Cheers Peter
It Was.....job made me appreciate making bushings, LOL
Richard, I have the same problem too. Can't take deep enough of a cut on this hard stuff to make the chip breakers work right. Be careful with those birds nests they can pull you in.
THE JOB THAT FIGHTS BACK! >=o
It sure did! :)
Oh my, , , Gloves make me shudder. I saw a friend get a glove snagged by a long chip and it pulled his arm right off. He died before we could get him to the hospital. We do stupid things thinking we are protected by them. On another occasion watched as another worker got tangled up in a 10 ft. master service radial arm drill the same way. You will never, ever see me with machine tools wearing gloves. I once fired a fella from doing just that. Please think and deal with flying chips with a simple straight 3/8 rod. Aside from that ass ripping I love working with 4140. Doesn't always give the best finish but really reliable stuff eh. Great order for ya bud but soooo many pieces would drive me nuts as I am sure almost did to you.LOL ! Your common sense is doing great on everything but the gloves bud. Take care and I hope to see you again with all your parts attached my friend. NO GLOVES !
my left arm was getting shredded by stringies as I turned the hand wheel to cut the last .020 to the shoulder. I had my arm , hand and glove no where near the chuck. It was a necessary evil and had firm grip on the wheel Dean. Love ya brother, thanks for watchin out
Thank you for sharing, and helping us learning!!!. I think that many of your subscribers have commented comprehensively.
I think the major problems are possibly lack of lathe power ( your lathe was probably designed to use HSS tools only), and the inserts you are using are positive rake, without chip breaker features. These type are ideal for older/less powerful machines, negative rake require more power, but generate shorter chips.
Again it is always easy to comment from an armchair etc.
Hope you get more contracts.
I dont disagree with any of that, I thank you for watching and commenting as well! ~ Richard