Help identifying threads per inch and starts of leadscrew


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Thread: Help identifying threads per inch and starts of leadscrew

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    Default Help identifying threads per inch and starts of leadscrew

    I'm working on restoring an old, hand-built CNC machine at my local hackerspace, and specifically have started focusing on building a new electronic control system for it. Unfortunately the machine was built custom by someone many years ago (maybe ~10) and comes with no documentation whatsoever, so I'm having to reverse engineer a few things.

    From the measurements and observations I've made so far, it seems to me that all axes are using 1/2" x 10 ACME leadscrews - does anyone think I might be mistaken about that?

    The last critical parameter I've been trying to figure out is the number of starts of these leadscrews. When I look down the end of the screw (attached) it looks like each thread is separate, which would mean this is a 10 start leadscrew. However, it doesn't seem like those are very common. Does anyone have some tips (or can see from the photos) to figure out how many starts my leadscrews have?

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    Default Re: Help identifying threads per inch and starts of leadscrew

    Looks like a 1/2-8 8 start.
    Count the threads at the end of the screw, where they end. It looks like there are 8.

    Last edited by ger21; 07-06-2017 at 09:06 PM.
    Gerry

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    Default Re: Help identifying threads per inch and starts of leadscrew

    Gerry's right... I have those same type screws on my DIY machine... 1" lead...



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    Default Re: Help identifying threads per inch and starts of leadscrew

    A-ha! I think you're right! My brain got stuck on the idea of 10 threads per inch for whatever reason, so whenever I looked at the end I just kept seeing 10 threads, haha. Now that you say 8 I totally see it. And I feel like I've seen / heard of 1/2" x 8 ACME leadscrews before.

    Thanks!



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Help identifying threads per inch and starts of leadscrew

Help identifying threads per inch and starts of leadscrew