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Re: [multimachine] quality of threaded rod

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  • 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 1 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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