Re: A big ol' chunk of delrin

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Sujet : Re: A big ol' chunk of delrin
De : muratlanne (at) *nospam* gmail.com (Jim Wilkins)
Groupes : rec.crafts.metalworking
Date : 21. Apr 2025, 01:51:53
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <vu44rs$vrlu$1@dont-email.me>
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"Snag"  wrote in message news:68053d6b$6$5278$882e4bbb@reader.netnews.com...
On 4/19/2025 11:41 AM, Bob La Londe wrote:
On 4/18/2025 6:45 PM, Snag wrote:
   Since no one currently has X axis leadscrew nuts available for my RF45 clone mill , I must make one . So I ordered a piece of acetal/ delrin . I've been studying videos of heat forming a nut to your leadscrew, all looks fairly easy . I'll use a piece probably about 2X2X3 for the nut . I bought a chunk that turns out to be 2 1/2X3X12 ... just in case it takes more than one attempt .
>
>
Let us know how it goes.  I first heard of heat forming Delrin nuts right here on this group years ago.  For my application I went with a spring loaded anti backlash Delrin nut from DumpsterCNC back then instead.  I don't think DumpsterCNC is still around.
>
   This is interesting , your text did not show up in the post over on
e-s but it did here on blocknews ...
   Now to the meat of the sammich . I have been out in the shop all
morning making a tap* to match - pretty closely - the leadscrew on the
mill . The plan as of right now is to tap the hole I have made in a
chunk of that delrin . I'm hoping for a tight fit so I can heat the
leadscrew to finish forming the threads without splitting the nut . If
it's loose I'll slice the nut in half and heat/clamp to finish forming
the threads . If it's too tight to thread on I can split one side to get
it on the leadscrew and heat form from there .
   *I still have to form the flutes on that tap . I'm thinking a 1/2 or
3/8 ball end mill With the tap held in a 4 sided collet holder or maybe
do 6 flutes since this tap is just under an inch . I used a chunk of
1.25" rebar for the tap since it was the closest in size to the finished
product and I hate wasting material . I'm not planning on hardening it ,
this will likely be the only time it will ever be used .
   I also have 9 inches of 2 1/2 inch square aluminum stock coming to
make a holder for the nut . Probably only use a couple of inches , but
hay , I'll have stock for other projects down the road .
   shop break
  Well , the tap idea isn't going to work , I guess I'll stop and
rethink my approach . But at least I was outta my wife's hair for the
whole morning !
--
Snag
--------------------------------
I did see Bob's post on E-S.
For a single use tap you could flute it with one corner of a square ended endmill, perhaps one with dull corners that you beveled sharp again, using your endmill fixture at the back relief instead of the cutting edge angle. If a hard spot in the rebar dulls it you can regrind it the same way. It's my go-to endmill for roughing steel of uncertain parentage and upbringing.
A tap drill size pilot plug on the tap may help keep it centered and straight.
In aluminum at least unhardened steel dulls quickly.
I will soon try making a tool from a scrap of broken rock drill pipe, and see how easy to saw and turn it is.

Date Sujet#  Auteur
19 Apr 25 * A big ol' chunk of delrin26Snag
19 Apr 25 `* Re: A big ol' chunk of delrin25Bob La Londe
20 Apr 25  `* Re: A big ol' chunk of delrin24Snag
21 Apr 25   +* Re: A big ol' chunk of delrin22Jim Wilkins
21 Apr 25   i+* Re: A big ol' chunk of delrin15Snag
21 Apr 25   ii+- Re: A big ol' chunk of delrin1Jim Wilkins
21 Apr 25   ii`* Re: A big ol' chunk of delrin13Clare Snyder
21 Apr 25   ii +* Re: A big ol' chunk of delrin11Snag
21 Apr 25   ii i+* Re: A big ol' chunk of delrin8Joe Gwinn
21 Apr 25   ii ii+* Re: A big ol' chunk of delrin3Jim Wilkins
21 Apr 25   ii iii`* Re: A big ol' chunk of delrin2Joe Gwinn
21 Apr 25   ii iii `- Re: A big ol' chunk of delrin1Jim Wilkins
21 Apr 25   ii ii`* Re: A big ol' chunk of delrin4Snag
22 Apr 25   ii ii +- Re: A big ol' chunk of delrin1Jim Wilkins
22 Apr 25   ii ii `* Re: A big ol' chunk of delrin2Joe Gwinn
22 Apr 25   ii ii  `- Re: A big ol' chunk of delrin1Snag
21 Apr 25   ii i`* Re: A big ol' chunk of delrin2Jim Wilkins
21 Apr 25   ii i `- Re: A big ol' chunk of delrin1Snag
23 Apr 25   ii `- Re: A big ol' chunk of delrin1Snag
28 Apr 25   i`* Re: A big ol' chunk of delrin6Jim Wilkins
2 May 25   i `* Re: A big ol' chunk of delrin5Mike Spencer
2 May 25   i  +* Re: A big ol' chunk of delrin3Snag
2 May 25   i  i`* Re: A big ol' chunk of delrin2Jim Wilkins
2 May 25   i  i `- Re: A big ol' chunk of delrin1Jim Wilkins
4 May 25   i  `- Re: A big ol' chunk of delrin1Jim Wilkins
21 Apr 25   `- Re: A big ol' chunk of delrin1Bob La Londe

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