Author Topic: trapeziodal "Acme" thread  (Read 250 times)

Offline speedibee

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trapeziodal "Acme" thread
« on: November 04, 2018, 06:36:38 PM »
is all Acme thread Metric ?  I need some new nuts for my lead screw and cross  slide , I have only seen metric nuts and screws offered . how do i measure an Acme thread ?
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Offline Lew_Merrick_PE

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Re: trapeziodal "Acme" thread
« Reply #1 on: November 04, 2018, 11:10:47 PM »
Speedibee  --  Most ACME threads are inch-based.  In the metric system they are called Trapezoidal threads.  I have the complete (ANSI) datasets for them should you care to e-mail me (tangent@olympus.net) and I would be happy to e-mail you copies.

Offline efrench

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Re: trapeziodal "Acme" thread
« Reply #2 on: November 05, 2018, 03:10:56 AM »
Metric trapezoidal threads are 30 degrees and Acme threads are 29 degrees.

Offline AdeV

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Re: trapeziodal "Acme" thread
« Reply #3 on: November 05, 2018, 03:14:08 AM »
I'm sure the ISO did that deliberately, just to make absolutely sure no-one could re-use their ACME tooling to make metric trapezoidal threads....
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Offline speedibee

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Re: trapeziodal "Acme" thread
« Reply #4 on: November 05, 2018, 08:01:21 AM »
thanks for the info . re.: trapezoidal and acme , seems like  metric are much easier to find than  imperial , and i want a nut to modify my cross slide with  , another thing is  are the screws hardened or would it be possible to buy a metric screw and nut and machine ther ends myself ?
You are  never alone with Schizophrenia