English or Metric?


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Thread: English or Metric?

  1. #1
    Gold Member chuckknigh's Avatar
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    Default English or Metric?

    I just got back from a little store here (I live in a small country town) and they actually have allthread rod! Trust me, this is a big thing, here.

    They also have it in english and metric sizes! 8mm fits the shafts of my rollerblade bearings, perfectly.

    Needless to say, though, it isn't ACME threaded. I know ACME is the preferred thread design for transmitting loads...but while the loads on a benchtop machine are significant, they're probably not huge.

    Two questions.

    One: Am I asking for trouble if I use 8mmx1.25 (threads per mm?) rod, instead of the english version? 5/16" is a pretty close fit, but it's not perfect. Will this create problems down the line, with calibration of software written by US programmers, or some such thing?

    Two: Should I hold out for ACME threads, or is normal allthread rod sufficient for these purposes?

    THANKS!

    -- Chuck Knight

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  2. #2
    Registered hardmill's Avatar
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    Default threads

    8 x 1.25 = .315dia x .0492 pitch

    5/16-18 = .3125dia x .0555 pitch

    If its being compensated for in the software i would'nt see any
    problems.



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    Registered balsaman's Avatar
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    Default

    What he said. Also, think about the nut/tap availability.

    Eric

    I wish it wouldn't crash.


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    Default

    Most all machine tool manufacturers use Metric ballscrews. Software should compensate for the differences.



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English or Metric?

English or Metric?