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ACME vs lead screw

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Harry Crowther17/04/2019 15:43:55
18 forum posts

Hi,

I was wondering if anyone knows the difference between a 'trapezoidal lead screw' and a 'ACME lead screw'? Or is ACME the brand name?

Brian G17/04/2019 16:18:44
487 forum posts
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They are both trapezoidal Harry. Generally I think the difference is whether the machine is imperial or metric. Acme (named for the Acme Machine Company) has a thread angle of 29 degrees and dimensioned in inches, whilst ISO trapezoidal threads have a thread angle of 30 degrees and are dimensioned in mm. I suspect however that in the long tradition of mixing standards you can get metric machines using the Acme thread form or imperial machines using the ISO form.

Brian

JasonB18/04/2019 09:34:48
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You will also find that ACME is made in imperial pitches given as tpi or threads per inch whereas the Trapezoidal come sin metric pitches eg 2mm , 3mm etc.

I would not say TR screws are more common in the UK as there are still a lot of old machines running imperial ACME screws but anything new and metric will have TR

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