Sujet : Re: A big ol' chunk of delrin
De : muratlanne (at) *nospam* gmail.com (Jim Wilkins)
Groupes : rec.crafts.metalworkingDate : 21. Apr 2025, 22:06:54
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <vu6c21$31to7$1@dont-email.me>
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"Snag" wrote in message
news:vu63mc$2qjrd$1@dont-email.me... The problem with that is that I'm not certain what the thread profile
is - probably acme but ... I was just thinking that I can make an
impression of the leadscrew , wax might work or clean the leadscrew well
and apply a release compound and mold one out of JB weld ... and use
that impression to grind a cutter . That piece of plastic is dialed in
on my 4 jaw , and ain't coming out just yet .
-- Snag---------------------------------An old way was to fit a piece of thin sheet metal into the leadscrew grooves, holding them up to the light to see gaps to remove, like restoring a wood chisel or plane blade with a square. Another was to press sheet lead into the thread or gear teeth. When you have a light-tight match you measure the angle and grind the bit to it, perhaps narrower so you can adjust the depth and width separately to fit. I made a fly cutter to mill an ANSI involute spline broach by cut and try.Polymer clay works well to copy shapes, such as your partly cut thread. It hardens when moderately heated and can be cut into a flat template. I didn't find a cheaper lubricant-filled alternative to Moglice, Rulon etc. though some suggested JB Weld.