Free 186 More Best Homemade Tools eBook:  
Get 2,000+ tool plans, full site access, and more.

User Tag List

Page 1 of 3 1 2 3 LastLast
Results 1 to 10 of 22

Thread: Grinding the Jaws

  1. #1
    bouboulas's Avatar
    Join Date
    Nov 2017
    Location
    GREECE
    Posts
    57
    Thanks
    46
    Thanked 204 Times in 44 Posts

    bouboulas's Tools

    Grinding the Jaws

    Hello everybody !!
    Grinding the Jaws on a 3 Jaw Chuck

    186 More Best Homemade Tools eBook

  2. The Following 11 Users Say Thank You to bouboulas For This Useful Post:

    asterix (Jun 16, 2022), Floradawg (Feb 28, 2022), GKK (Mar 31, 2020), Home-PC (Jun 15, 2022), HUMARIA (Apr 5, 2020), johncg (Nov 22, 2022), Jon (Apr 2, 2020), kess (Apr 1, 2020), mwmkravchenko (Mar 31, 2020), Okapi (Apr 1, 2020), Tonyg (Mar 31, 2020)

  3. #2
    Supporting Member jdurand's Avatar
    Join Date
    May 2019
    Location
    Krasnodar Krai, Russian Federation
    Posts
    1,456
    Thanks
    126
    Thanked 742 Times in 416 Posts

    jdurand's Tools
    Of course they will now be accurate ONLY at that diameter since most of the error is in the spiral, not the jaws.

    2000 Tool Plans

  4. The Following 2 Users Say Thank You to jdurand For This Useful Post:

    Okapi (Apr 1, 2020), Scotty1 (Mar 31, 2020)

  5. #3
    Supporting Member Ralphxyz's Avatar
    Join Date
    Dec 2016
    Posts
    1,564
    Thanks
    2,378
    Thanked 279 Times in 228 Posts

    Ralphxyz's Tools
    The indicator at the end is not the same diameter and is much improved.

  6. #4
    Content Editor
    Supporting Member
    DIYer's Avatar
    Join Date
    Aug 2013
    Posts
    3,056
    Thanks
    772
    Thanked 1,850 Times in 1,652 Posts


    Thanks bouboulas! We've added your Chuck Jaw Grinding Method to our Lathes category,
    as well as to your builder page: bouboulas's Homemade Tools. Your receipt:




  7. The Following User Says Thank You to DIYer For This Useful Post:

    bouboulas (Apr 7, 2020)

  8. #5
    Supporting Member
    Join Date
    Feb 2016
    Posts
    122
    Thanks
    22
    Thanked 21 Times in 19 Posts
    I would cover the ways of your lathe. This guy looks to me like a wanna be u-tube star
    Last edited by G.Paul; Apr 1, 2020 at 06:12 AM. Reason: adding

  9. #6
    Supporting Member gatz's Avatar
    Join Date
    Feb 2016
    Posts
    167
    Thanks
    2
    Thanked 144 Times in 50 Posts

    gatz's Tools
    definitely cover the ways!

    Get rid of the long-sleeve shirt!

    Get rid of the jewelry!

  10. #7
    Supporting Member thehomeengineer's Avatar
    Join Date
    Nov 2017
    Location
    Berkshire UK
    Posts
    705
    Thanks
    720
    Thanked 2,062 Times in 406 Posts

    thehomeengineer's Tools
    I think this is a new chuck that could have been adjusted on the back plate. I have seen this so many times when a new chuck is fitted to a lathe that it doesn’t run true The chuck needs to have a bit of adjustment on the back plate or you will never get a new chuck to run true. A friend only a month back bought a new chuck for a Myford lathe and explained it was no good. I removed the chuck from the backplate re machined the back plate used a test bar and clocked the new chuck true to lathe axis. Unfortunately the chuck in the video will never be true as the reverse jaws will also run out and the jaws ground will not be able to hold anything internally as these will not be true to the lathes centre line either. Very expensive mistake I am afraid.
    The Home Engineer

  11. #8
    Supporting Member gatz's Avatar
    Join Date
    Feb 2016
    Posts
    167
    Thanks
    2
    Thanked 144 Times in 50 Posts

    gatz's Tools
    @thehomeengineer ,
    I had thought of that too, and it looks like there are 3 (?) bolts holding the backing plate to the chuck which would have allowed adjustment.
    However, the chuck body "appears" to be running true..with no discernible run-out; if it did have, it would've been vibrating.
    He should have checked that first.

    I don't know why he thinks TIR of .002 is sufficient.

  12. #9
    Supporting Member thehomeengineer's Avatar
    Join Date
    Nov 2017
    Location
    Berkshire UK
    Posts
    705
    Thanks
    720
    Thanked 2,062 Times in 406 Posts

    thehomeengineer's Tools
    Hi gatz
    I do understand that we all do things differently.
    But I am also curious why the front of the jaws are ground deeper than the rest of the jaw. The ring made for the second operation could have been slipped over the Internal jaws and the jaws ground in one pass which would be the normal way to true an old worn chuck. (Of course i still think checking that the chuck could not be run concentric on the back plate first) This chuck would have been in the region of £150/£250 and I do feel a bit sorry for the guy as I am sure he did this with the best intention but with out thinking the whole job through. There is plenty of experience people who would be more than happy to share their knowledge and experience on how they would have approached this task before sending in the grinder.

  13. #10
    HUMARIA's Avatar
    Join Date
    Sep 2017
    Location
    Netherlands
    Posts
    9
    Thanks
    76
    Thanked 3 Times in 3 Posts
    Maybe it would be better to first ask why he did it this way instead of commenting a lot about the how and why. Maybe then we'll come to the conclusion that it was a good way to do it this way.

  14. The Following User Says Thank You to HUMARIA For This Useful Post:

    thadrodgers (Nov 21, 2022)

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •