Machining a New Lead Screw for a Covel Surface Grinder - Left Hand Acme Threads

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  • Опубліковано 3 лис 2024

КОМЕНТАРІ • 242

  • @bellofbelmont
    @bellofbelmont 2 роки тому +1

    I lost dad in 1995. He would have LOVED youtube and your channel in particular. Great vids to watch and learn. Jim Bell (Australia)

  • @ThomasBurns
    @ThomasBurns 2 роки тому

    Another great video. It's so educational to watch you work!

  • @capitanschetttino8745
    @capitanschetttino8745 2 роки тому +28

    I love when you make brand new and fully functional parts for old machines. Its like a little time travel for me. Beautifull.

  • @Ambidexter143
    @Ambidexter143 2 роки тому +31

    It's enjoyable to watch an expert show how a difficult job is actually easy to do when you know what you're doing.

  • @aner_bda
    @aner_bda 2 роки тому +1

    Watching threads be cut on a lathe is just so memorising and soothing somehow. Thanks as always for sharing these projects.

  • @fredbloggs4829
    @fredbloggs4829 2 роки тому +7

    I have seen at least 3/4 of all your videos, and I really enjoy the instructional ones. The videos where you take the time to explain the details. Even after seeing so many videos from the past, it's really enjoyable and like a re-fresher course.
    I hope your friend likes his new lead screw.

  • @MikeBaxterABC
    @MikeBaxterABC 2 роки тому

    Just got to say the intro music is so calming, and let me know I'm going to be entertained and probably learn a thing or two as well!:)

  • @wirenut003
    @wirenut003 2 роки тому

    Nice accurate workmanship .The guy should be happy with new part.

  • @almostanengineer
    @almostanengineer 2 роки тому

    I love the viewer projects, you never know what your gonna get, and it’s always interesting.

  • @bustednuckles2
    @bustednuckles2 2 роки тому

    There is no substitute for experience and that blazes brightly here.

  • @mongomay1
    @mongomay1 2 роки тому

    Thanks Keith and Ron.

  • @cameronmccreary4758
    @cameronmccreary4758 2 роки тому +1

    Very nice work, congratulations!

  • @LNM0000
    @LNM0000 2 роки тому

    Seen Steve Summers just pull the toolpost back towards him when he's returning the tool. And another name drop.... as Rob Renzetti says, everything flexes, its just a question of how much 😎. Cracking videos mate 🙂

  • @murphymmc
    @murphymmc 2 роки тому

    Very nice Kieth. As a friend of mine once said, "You don't beat a guy at what he does for a living". It's a pleasure to watch and learn. Thanks.

    • @paulcopeland9035
      @paulcopeland9035 2 роки тому

      Keith doesn't do this "for a living"! He is a superb hobiest with a world class shop. His "day job" is with Bayer crop science. The guy is busy to say the least.

  • @davidhaywood9071
    @davidhaywood9071 2 роки тому

    Your ability makes difficult jobs look easy.

  • @rexmyers991
    @rexmyers991 2 роки тому

    “I like it!” Me, too! Very nice job, Keith. As always I learned something. Thanks

  • @Scorpio722
    @Scorpio722 2 роки тому +1

    Great to see a classic Covel still in use. Used to work with one of the Clausing-Covel field tech/mechanics years ago. Great videos Mr. Rucker!

  • @latisimusd
    @latisimusd 2 роки тому

    As a retired fella that is building a home hobby machine shop. Watching you produce that part was so enjoyable and relaxing. Gives me some confidence in my projects. Great info on the tool pressure on the last two passes for your final measurement :-)

  • @davidhudson5452
    @davidhudson5452 2 роки тому

    Well done Keith

  • @echoewest2685
    @echoewest2685 2 роки тому

    Fun to watch, thanks for sharing!

  • @t.d.mich.7064
    @t.d.mich.7064 2 роки тому +2

    Back in the late sixties, I lived just a few miles from the Covel (pronounced Cov'-el) facility. My sister-in-law took care of their payroll dept. I believe they were purchased by Atlas Press Co around 1968, and went out of business in the mid 70's. I would drive past and see the Scraper Hands outside the building taking a smoke break. Scraper in one hand, butt in the other, with spotting blue on their hands and apron. I thought to myself, I'm glad I'm a Toolmaker!

  • @garthbutton699
    @garthbutton699 2 роки тому

    Thanks for allowing us to look over your shoulder🤗😎🤗😎

  • @catfishgray3696
    @catfishgray3696 2 роки тому

    PET THE CATS AND DOGS, TELL EVERYBODY HAPPY NEW YEAR, GREAT VIDEO...

  • @rickpalechuk4411
    @rickpalechuk4411 2 роки тому +16

    That nut is probably packed full of grinding dust to take out that shaft like it did.
    Thanks for sharing Keith,
    Cheers

    • @dtoad48
      @dtoad48 2 роки тому +6

      or the nut was replaced a few times and shaft never.

    • @rickpalechuk4411
      @rickpalechuk4411 2 роки тому +2

      @@dtoad48
      That's possible also. Sure was lots of crud on the shaft when he screwed the nut on at the end.

    • @ronwilken5219
      @ronwilken5219 2 роки тому +3

      I'm rather surprised that Keith didn't take that nut to the parts washer first to get all the crud out of it before threading it onto the new shaft. No wonder it didn't feel very sloppy. It sure deposited a bunch of crud onto the new screw.
      Yes the new screw is to proper dimensions but it's not matching the nut.
      Should it have been made to match a cleaned, used nut or make a new nut to match the new screw?
      As Kieth said, an expensive piece of bronze so maybe the screw should have matched the worn nut.

    • @elrond12eleven
      @elrond12eleven 2 роки тому +6

      @@ronwilken5219 Brass nuts never wear much on steel shafts because steel chips and other abrasive gunk stuck in more soft brass and scratch hard steel. The same is in clockwork - steel shafts of cogwheels wear more than holes in brass plate.

    • @rickpalechuk4411
      @rickpalechuk4411 2 роки тому +1

      @@ronwilken5219
      And being for cross feed adjustment maybe they felt it is not as critical as Z increment.
      It has started an interesting discussion 🙂

  • @richardjohnson1764
    @richardjohnson1764 2 роки тому +1

    Makes want to get a dro for both my lathes. Nice work.

  • @ronmurphy9819
    @ronmurphy9819 2 роки тому

    Beautiful and inspiring. Thank you

  • @JTL1313
    @JTL1313 2 роки тому +2

    You can purchase a new nut (without the flange) for a reasonable price from McMaster Carr and then make a flange to fit the nut. You can also purchase 3/4 -10 Acme bar from various venders and machine it down for the 1/2” threads and flats. Not having Kieth’s skills; that is what I did for my surface grinder lead screw an nut replacement.

  • @billmorris2613
    @billmorris2613 2 роки тому +1

    Good morning to all from SE Louisiana 7 Jan 22.

  • @erich9244
    @erich9244 2 роки тому +10

    Thanks for bringing us along for the ride I feel like it is shop class and I am in 10th grade again, bless you for your explanations and sharing your wisdom :) Keep on keeping on!

  • @scottnj2503
    @scottnj2503 2 роки тому

    Tool pressure gem. Sage advise🤓 I'd not have thought that.

  • @dfishpool7052
    @dfishpool7052 2 роки тому

    Thank you Keith for an excellent presentation on cutting the LH thread.

  • @tinkmarshino
    @tinkmarshino 2 роки тому +1

    Always a nice way to spend a winter afternoon.. Thanks Keith for sharing your passion.. Not only did I enjoy them all but I learn an awful lot watching you.. I have always been a hands on learner and this is great! Carry on!

  • @cschwad559
    @cschwad559 2 роки тому

    I love single point threading, will do it at every opportunity.

  • @MrUSNMasterChief
    @MrUSNMasterChief 2 роки тому +3

    Thank you Keith, Great Job as always.

  • @yt66228
    @yt66228 2 роки тому +1

    Very well done. Need to make one for my grinder. Thanks.

  • @forresta65
    @forresta65 2 роки тому

    a thing of beauty.

  • @Wilett614
    @Wilett614 2 роки тому

    I NEVER pile tools up on my Lathe Headstocks ! A SAFETY Hazzard you don"t Need or Want : )
    I have a "Cincinnati Tray Top" Lathe But NEVER set tools up on the Headstock Tray for that reason .
    And never had an Issue : ))
    Nice video Presentation , Most guys cant even turn RIGHT Hand Acme threads let alone Left handed ones ! I own A Vintage Covel Surface grinder like the one you made that lead screw for . I have Made numerous New Parts for it as well .... Thanks

  • @EvanLightner304
    @EvanLightner304 2 роки тому +4

    When I do acme threads I set the compound parallel with the ways, that way I can trim the side of the thread to get a little play in the thread. First time seeing someone do the 14° method. Nice work

  • @mdouglaswray
    @mdouglaswray 2 роки тому

    The best thing about old machinery is that you can FIX IT.

  • @fredclark4033
    @fredclark4033 2 роки тому

    Everything is so much better when you know what you are doing. Thanks Keith

  • @alanroy5629
    @alanroy5629 2 роки тому

    Amazing precision

  • @MatthewScott
    @MatthewScott 2 роки тому

    Great work as always

  • @TrPrecisionMachining
    @TrPrecisionMachining 2 роки тому +1

    good job keith

  • @steveb9270
    @steveb9270 2 роки тому

    Hi there greetings from down under. Love old school machining the young push button kids today could learn a lot from us old farts . LOL 😆 I work for a valve manufacturer here in oz and cut acme threads nearly every day , you don't have to turn the top slide just keep it on 0 plunge into the depth then you might have to go sideways a bit on the final cut ,. Keep those videos coming cheers 🍻

  • @ericgelman2792
    @ericgelman2792 2 роки тому

    I’m lucky enough to have a Ron Brese plane-he makes beautiful tools

  • @llapmsp
    @llapmsp 2 роки тому

    Another awesome job. Thanks for sharing.

  • @wilkuyf1559
    @wilkuyf1559 2 роки тому +2

    love your videos keep em coming , regards from Holland !!!!!

  • @roylucas4414
    @roylucas4414 2 роки тому +3

    What a great video! I enjoyed each step in the process. Thank you.

  • @AmateurRedneckWorkshop
    @AmateurRedneckWorkshop 2 роки тому

    You made that look easy. I don't remember ever cutting an Acme thread.

  • @brandenpatterson2776
    @brandenpatterson2776 2 роки тому +1

    Great project Keith !

  • @jstephenallington8431
    @jstephenallington8431 2 роки тому +4

    Great video as always Kieth. It's interesting that the screw was so worn but not the nut. As you know, the nut is made of a somewhat soft material (brass or bronze) and the screw is made of a harder material so of the two the nut will wear out first being easier and cheaper to replace than the screw. Maybe the nut had been replaced once before. Anyway, I'm looking forward to the next video episode.

    • @CothranMike
      @CothranMike 2 роки тому +1

      J, I too noticed that and agree the nut should have worn out first so that's probably the second nut as you state. Bronze nut did however wiggle up and down even if it didn't wiggle back and forth in the thrust direction. I also saw dirty gritty oil inside the nut which means it needs to be cleaned out or it will lap the new shaft as it did the old shaft.
      --
      MikeC

    • @larrywalker7759
      @larrywalker7759 2 роки тому +8

      Wear is not always inflicted onto the softer material because there is another factor to consider than just the 2 dissimilar metals in this assembly.
      It is true that brass or bronze is softer than steel, but in this application (part of a surface GRINDER) you must factor in the inevitable presence of abrasive particles that are shed from the grinding stone both in normal operation use and during dressing of the stone. Of the 3 different materials in the equation here, the abrasive stone particles are by far the hardest. Over time some of this "grit" will find its way into the interface of the steel threads of the rod and the brass threads of the nut where the particles will embed into the brass. At that point, the abrasive particles begin to remove traces of steel from the rod while effectively "protecting" the nut against wear. I have seen this to be the case where a soft material is in contact with a hard material, the soft material usually outlives the hard material.

  • @wrstew1272
    @wrstew1272 2 роки тому

    I have seen some of his work, and wish that I could justify the addition to my tool stable. Jewelry for woodworking. Great job, it’s pleasant to see a practitioner of the metal arts at work.

  • @varmint243davev7
    @varmint243davev7 2 роки тому +2

    Very nicely done !

  • @bulletproofpepper2
    @bulletproofpepper2 2 роки тому

    Thanks for the info!

  • @passenger6735
    @passenger6735 2 роки тому

    Very nice work Keith. He'll be well pleased with that. It would have been a nice bonus to have done the nut as well.

  • @justinduffey9237
    @justinduffey9237 2 роки тому

    Thanks Keith

  • @timziegler9358
    @timziegler9358 2 роки тому

    Fine job! It is a pleasure watching you work. Best wishes.

  • @billmorris2613
    @billmorris2613 2 роки тому

    As usual I really enjoyed the ride.

  • @jimc4731
    @jimc4731 2 роки тому +5

    You could make that nut adjustable to tighten it up a little.
    Split the flange end in on center for about 1 1/2" and drill and tap two 1/4"-20 parallel cross holes on each side of center, the screws to tighten onto the shaft to take out play.
    Not much work for a great improvement!
    Keep up the good work!
    JIM 🙂

    • @forbesmathews89
      @forbesmathews89 2 роки тому

      That will tighten things up , But will not help the back lash.......

  • @ruperthartop7202
    @ruperthartop7202 2 роки тому

    Great, thanks Keith

  • @ellieprice363
    @ellieprice363 2 роки тому +1

    Great job. I made a lead screw almost identical to this one for my Kent 6 x 18 manual grinder. Mine was 3/4-10 L.H. acme also worn badly in the center.
    The first shaft I made was a little loose so I made the second slightly larger to compensate for nut wear. I recall feeding straight in instead of at the 14.5 angle. If kept oiled soft shafts like this will last a long time.

  • @quinntalley1681
    @quinntalley1681 2 роки тому

    Good, clear, and concise explanations, as always. Thanks.

  • @ninjagobble
    @ninjagobble 2 роки тому

    Awesome work!

  • @richw0123
    @richw0123 2 роки тому +1

    lovely job, I regularly make tiny pivot pins for surgical instruments out of Titanium, around 1mm diameter for work, I still love watching turning and chips being made, even by other people, it's the best bit of my job.

    • @bwyseymail
      @bwyseymail 2 роки тому

      Small stuff . . . I assume you have been watching Joe Pie's model machine tool videos.

    • @richw0123
      @richw0123 2 роки тому

      @@bwyseymail yes, those videos too!

  • @elrond12eleven
    @elrond12eleven 2 роки тому +10

    Brass nuts never wear much on steel shafts because steel chips and other abrasive gunk stuck in more soft brass and scratch hard steel. That's why lead screws are made of steel and nuts are made of brass - it's cheaper to make a new screw rather than new nut.
    The same is used for glass polishing in making lenses or concave mirrors for telescopes: abrasive sticks to soft base (rosin, sealing wax etc.) and cuts pretty hard glass.

    • @billspear7702
      @billspear7702 2 роки тому +3

      A bronze disk will cut a diamond the same way, diamond dust is introduced at the start of the cut, and largely self replentishes as the cut procedes.

  • @jaydoherty8402
    @jaydoherty8402 2 роки тому +6

    Keith someone pointed out that your threading tool was rubbing the live center while you were dialing in the last couple passes on the 1/2-13 end of the shaft (around 13:50 in the video). Might want to check on your live center. Although you don't usually grip parts that high up on the live center anyways so probably no big deal.

    • @CothranMike
      @CothranMike 2 роки тому +2

      Jay, I haven't read any further than your comment and mine is hours after yours so this may already been covered but the type of live center that he's got is a double angle; the center of the 60° is only on the very point the rest of it is just clearance for that very problem which is your point I think, the tool holder for the insert is going to butt against that turning surface. I was also looking for that as the diameter got smaller and smaller. I did see where the chip riding along with the insert body scrapes some oil off the surface and made a shiny spot, and then a larger spot. I also saw where the spacing changed a bit in the z axis toward the chuck so all was well.
      I have had to remove for clearance that portion closest to the engagement area on several tools, but that was just the demands of the work. We all deal with life's gotcha's as we understand them at the time.
      Even it it was pressing at that point and rubbing - creating heat, that surface is intended to be clearance for any tooling used on the supported shaft end. No problems unless he had bent the axial thrust bearing or applied pressure to dislodge the tailstock. He was well short of that.
      --
      MikeC

  • @johnquinn3899
    @johnquinn3899 2 роки тому

    Interesting piece of work Sir !!

  • @robertseltmann
    @robertseltmann 2 роки тому

    Nice job

  • @markbernier8434
    @markbernier8434 2 роки тому +6

    I had expected the shaft to be heat treated. Please explain why not. Also, I would have liked to see the inside of that nut, maybe run a tap through it if the owner had not.

  • @briand01
    @briand01 2 роки тому

    looks beautiful

  • @RB-yq7qv
    @RB-yq7qv 2 роки тому

    Nice Job

  • @edwardconway5955
    @edwardconway5955 2 роки тому

    Great Video!

  • @MachiningandMicrowaves
    @MachiningandMicrowaves 2 роки тому +2

    I've tried using a travelling steady/follow-rest when cutting long threads, to help counteract deflection from tool pressure in the middle of the cut. Seems to work OK on Acme threads, where the thread tips are wide and flat, but close to completion of the thread forms for ISO metric threads, where the support was really needed, it wasn't as effective because of the sharp tips to the thread forms. Also there are clearance issues, as the rubbing surfaces of the rest need to be ahead of the cut, so chips don't get caught under the pads, and that might mean the rest interferes with the rotating centre or a shoulder. My current project needs a 7/16" 12 tpi Acme leadscrew in stainless steel. That's going to be fun.

  • @billmorris2613
    @billmorris2613 2 роки тому +3

    With the two pieces laying next to each other the wear in the original one was easy to see. I could actually see that there original was slightly concaved.

  • @kentuckytrapper780
    @kentuckytrapper780 2 роки тому

    Excellent job Keith, great video, keep'um coming..

  • @kenbolton6850
    @kenbolton6850 2 роки тому

    Well done

  • @johnlee8231
    @johnlee8231 2 роки тому +1

    nice job

  • @tomgale8154
    @tomgale8154 2 роки тому

    they work hard buy them a beer from time to time

  • @elsdp-4560
    @elsdp-4560 2 роки тому

    Thank you for sharing. Enjoyed.👍

  • @mjk8710
    @mjk8710 2 роки тому

    Good work Keith l/h acme thread cool to see sir 💯👍🏻🇬🇧

  • @StevenEverett7
    @StevenEverett7 2 роки тому +1

    I just finished watching several Roadrunner shows from the sixties. I was rather surprised to see the title of this one! 😆😆😆

  • @bcbloc02
    @bcbloc02 2 роки тому

    Nicely done!

  • @RichardHeadGaming
    @RichardHeadGaming 2 роки тому

    Screwing around on the lathe I see, nice work.

  • @millomweb
    @millomweb 2 роки тому

    Keith, I bet it's nice to be threading a decent length of bar for a change !

  • @seephor
    @seephor 2 роки тому +2

    Keith. I'm not sure how eager you are to try something new but I think it would be cool to try and spray weld the entire acme thread full then recut the threads. I'm not saying this would be better in any way but it would be interesting to see how the threads cut as well as the longevity of the repair. Just a thought.

  • @philstevens8950
    @philstevens8950 2 роки тому

    Keith,I just came across your videos and heard you mention a museum and was wondering what the name and location is .
    Thanks Phil Stevens

  • @papaburf7275
    @papaburf7275 2 роки тому

    Another great video - thanks so much for the content.

  • @theharbinger2573
    @theharbinger2573 2 роки тому

    Watching this made me want an ice cream cake - Covel - Carvel - mmmm. Just helping the analytics, Happy New Year Keith.

  • @organbuilder272
    @organbuilder272 2 роки тому

    Interesting, Keith. Master machist at work. Yes, surprising that the nit was not a little loose. but a beautiful fit. Thanks for the tutorial as well, Keith.

  • @tonyc.4528
    @tonyc.4528 2 роки тому +3

    I'd try making one myself if my lathe was running, but it seems you need a working lathe to make the parts for non-running lathe!

  • @don4364
    @don4364 2 роки тому +1

    Always enjoy watching a true master at work. Thank you for the intuitive video.

  • @beornwhetstone2797
    @beornwhetstone2797 2 роки тому +2

    All the math makes my head hurt, but very interesting

  • @outbackladas
    @outbackladas 2 роки тому

    Well done, nice job 👍

  • @glennmoreland6457
    @glennmoreland6457 2 роки тому

    Good video
    🇬🇧🙂

  • @jwaterous224
    @jwaterous224 2 роки тому

    I think surface grinders have a bit of movement on that nut since the grinding head is resting on ways and some movement occurs during operation of automatic down - feed. Anyway Keith got some math into this episode of left hand ACME thread turning. Nice turn out.

  • @d.gregorybrown7779
    @d.gregorybrown7779 2 роки тому

    very nice

  • @markwatters6875
    @markwatters6875 2 роки тому

    Thank you for another great video.

  • @55ATA3
    @55ATA3 2 роки тому

    I would change the nut, you don't want any damage that the nut has to be transferred to the new shaft. But I like to be take extra care on the equipment that I need to be right the first time. At least I would check the nuts threads with a thread gauge to see if there is any damage to it.. Great video, thanks for showing us how much care is needed to make a good lead screw.

  • @teamidris
    @teamidris 2 роки тому

    I cut my nut, rotated it a bit and soldered it back together. And that was okay, but I still wonder about getting it in the pipe crimp to reduce it. Maybe even run a tool down it. that looks like it would take a ball screw, and oh my goodness are they good 😊

  • @mikeyzs
    @mikeyzs 2 роки тому +7

    Who noticed the threading tool hitting the live centre 🙈

    • @Craneman4100w
      @Craneman4100w 2 роки тому +3

      Who noticed the half inch nut not fitting?