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Subject: Re: A big ol' chunk of delrin
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From: Snag <snag_one@msn.com>
Date: Sun, 20 Apr 2025 13:31:49 -0500
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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
We live in a time where intelligent people
are being silenced so that
stupid people won't be offended.