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Re: [multimachine] quality of threaded rod

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  • Chris Tofu
    ... Wow, aren t those tolerances huge!? Would definitely need a lot more accuracy to produce a diffraction grating. 100,000 or more threads per inch.
    Message 1 of 27 , Jun 24, 2013
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      On Mon, Jun 24, 2013 7:20 AM PDT Bruce Bellows wrote:

      >A precision class acme thread will have a tighter tolerance between the thread pitches.
      >For example 10tpi thread
      >2G class has a tolerance of .0095
      >3G class has a tolerance of .0044
      >2G class has a tolerance of .0032

      Wow, aren't those tolerances huge!? Would definitely need a lot more accuracy to produce a diffraction grating. 100,000 or more threads per inch.
    • David G. LeVine
      ... No, they are not. Differential accuracy is MUCH better with a preloaded nut. If you move a foot, you could see 0.01 error, while moving a few
      Message 2 of 27 , Jun 25, 2013
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        On 06/24/2013 11:36 AM, Chris Tofu wrote:
        >> A precision class acme thread will have a tighter tolerance between the thread pitches.
        >> >For example 10tpi thread
        >> >2G class has a tolerance of .0095
        >> >3G class has a tolerance of .0044
        >> >2G class has a tolerance of .0032
        > Wow, aren't those tolerances huge!? Would definitely need a lot more accuracy to produce a diffraction grating. 100,000 or more threads per inch.

        No, they are not. Differential accuracy is MUCH better with a preloaded
        nut. If you move a foot, you could see 0.01" error, while moving a few
        thousandths would more likely be in the tenths or hundredths of a
        thousandth range or smaller.

        Dave 8{)

        --

        "A word to the wise ain't necessary - it's the stupid ones that need the
        advice."

        Bill Cosby
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