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From: "Jim Wilkins" <muratlanne@gmail.com>
Newsgroups: rec.crafts.metalworking
Subject: Re: Mill parts
Date: Wed, 20 Nov 2024 17:57:10 -0500
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"Jim Wilkins"  wrote in message news:vhl9rg$7h7l$1@dont-email.me...

I would try making a mild steel tap that closely resembled the leadscrew to
pre-form the Delrin before compressing it onto the heated original.
-----------------------------
I just discovered that the metric equivalent to Acme has a 30 instead of 29 
degree thread groove angle.