cast iron or steel - gears on an old lathe - Page 2
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  1. #21
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    Quote Originally Posted by DMF_TomB View Post
    malleable iron is heat treated cast iron. Chinese had it easily 2000 years ago.
    That's news to me. Ever hear of magnesium?

  2. #22
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    Thank you for the information! I did contact Grizzly and was told that they did not have any parts for it, but I'll add your information to the file. Yes, the "banjo" piece is not missing, just needed to take it off to get the gears off - they were warmed and pressed out. Based on your, dgfoster, and others recommendations, I am strongly leaning towards ductile iron casting.

  3. #23
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    Probably a dumb question but.... why? Maybe this is where the choices of shaving, shaping, hobbing or grinding come in?

  4. #24
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    Quote Originally Posted by b.rett View Post
    Maybe this is where the choices of shaving, shaping, hobbing or grinding come in?
    Space cutter and a dividing head is good enough for these, actually.

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  6. #25
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    Fix it.

    Here's how I did

    metalmagpie

  7. #26
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    Quote Originally Posted by DMF_TomB View Post
    malleable iron is heat treated cast iron. Chinese had it easily 2000 years ago.
    .
    belt buckles, , pipe fittings, C clamps and many many other items were made from malleable iron long before ductile iron was invented discovered. even regular grey cast iron comes in different grades. the stronger it is the harder to machine.
    .
    lathe gears hard to say what made out off. i have seen zamak or zinc aluminum alloys too. even seen plastic gears on really cheap stuff. of course a high strength heat treated steel is sometimes used for gears too
    Yes, but a special cast iron called white iron.

    Tom

  8. #27
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    My chinese lathe, a Victor (But made in the PRC!) had fixed compound change gears made with two slightly different foreign tooth forms*, I'd never even heard of such a thing (Still don't know why they did that) and ran one against the other because, yes, they were that close to the same.
    I machined off the teeth, made a brass ring which I pressed on and fixed to the hub with setscrews running between the brass/steel press line like keys, four of them, then sent the gear to my favorite gear cutter with another gear with the correct tooth form and they cut it. That was at least 15 years ago and it still shows no wear, looks funny, guess I could blacken the brass,,,,

    *Probably module? they looked almost identical and appeared to run together, which they did for about 10 minutes!

  9. #28
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    Quote Originally Posted by johnoder View Post
    And to follow on Jims'



    ph
    What am I looking at here?

  10. #29
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    Quote Originally Posted by 10 fingers View Post
    We manufacture thousands of new change gears annually. Both as specials and sets for machines we build. For typical applications gray iron bar is ideal. If using steel, gears must have lubrication.
    How amazingly appropriate that your "metal type" is Cast Iron! This will soon be ruined when you reach 500 posts. Too bad!


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