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  1. #1
    Join Date
    Jul 2019
    Location
    Caboolture
    Age
    43
    Posts
    22

    Default Mars lathe resto

    Hi i will be soon starting the resto / revival of my mars lathe.
    I dont think the 3 jaw chuck is original to the machine and needs work.
    I will end up cleaning it up but jaws need grinding aswell.
    Ive 3D printed a holder for my dremel to do this but....

    Do i go through the rebuild or do i just buy a new chuck?

    Thanks

  2. #2
    Join Date
    Nov 2017
    Location
    Geelong, Australia
    Age
    53
    Posts
    646

    Default

    I'd say go ahead with cleaning up the one you've got and see how it goes.
    Only investment is a small amount of time - worst case it will still be better than it is now and even if you end up deciding its not good enough and buying a new chuck you can still use this one for another project/machine.

    Steve

  3. #3
    Join Date
    Oct 2008
    Location
    Cairns, Q
    Posts
    575

    Default

    Have a look at this video. It shows a jig which allows you to grind the jaws with the load on them in the same direction as when the chuck is in use. This can help to improve the accuracy of the grind by partly compensating for wear. It will be better at the setting at at which you grind the jaws as mentioned above, but should give some improvement over the whole range.

    https://www.youtube.com/watch?v=4OMLAJAYKAw

    Frank.

  4. #4
    Join Date
    Jul 2019
    Location
    Caboolture
    Age
    43
    Posts
    22

    Default

    i definitely need to do the jaws.

    It hasnt been used apparently for over 40 years.

    Has thrust issues also, so i think i need another thrust plate maybe.
    Then jaws ground it hopefully it would be a lot better

    thanks

  5. #5
    Join Date
    Jul 2019
    Location
    Caboolture
    Age
    43
    Posts
    22

    Default

    took chuck off yesterday and cleaned up a little to see manufacturer markings.

    Warren and Brown logo stamped into it.

    I think ill clean this up and see how it goes, i like the idea of having the nostalgia and the Australian parts.

  6. #6
    Join Date
    Oct 2012
    Location
    Mullaloo WA
    Posts
    36

    Default

    In the YouTube video, one of the best methods of jaw grinding I have seen.

    Col

  7. #7
    Join Date
    Jul 2019
    Location
    Caboolture
    Age
    43
    Posts
    22

    Default

    yeah, i like that jig.

    Just dont think i am skilled enough just yet to make it precise enough.

    I have seen other videos using a ring or pipe around the outside and retracting jaws until they hold tight.

  8. #8
    Join Date
    Oct 2008
    Location
    Cairns, Q
    Posts
    575

    Default

    Quote Originally Posted by canplaythegame View Post
    I have seen other videos using a ring or pipe around the outside and retracting jaws until they hold tight.
    That way you are taking the thrust on the opposite side of the scroll or screw from where it (and most of the wear) occurs during use. This might or might not be a problem, depending the amount of wear on the jaw slides and scroll or screw. The other way sometimes used is to put a narrow ring on the inner end of the jaws inside the chuck, and tighten the jaws onto that, which gets the thrust in the right direction, and grind in as far as the ring. Then remove the ring and grind away the shoulder where the ring was sitting.

    Frank.

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