RE: 1/4-20 thread?

From: will pattison (
Date: Wed Mar 24 1999 - 17:50:14 EET

polycarb does not machine very well. i suppose i should have been more
specific and stated that "sls nylon materials machine very well". i never
even think of poly anymore because trueform and nylons have taken it's


-----Original Message-----
From: Tom Richards
Sent: Wednesday, March 24, 1999 12:33 PM
Subject: RE: 1/4-20 thread?

Good idea! Which sls material are you machining? Carbonate?

At 08:32 AM 3/24/99 -0600, you wrote:
>i have never actually built any threads finer than about 3/4-16, but i am
>speaking from several years experience as a dtm applications engineer, and
>more recently as a user of sanders, sla, and sls. given that the nominal
>laser beam diameter in the sls process is 0.010"-0.020" (depending on
>process parameters), and that the melt zone it creates will be similar in
>magnitude, you quickly run into resolution problems with features like a
>1/4-20 thread. the beauty of sls, though, is that it machines so well.
> so, save the hassle, not to mention the cad time to create the thread in
>the first place, and just drill and tap that sucker.
>remember, the key to rp success is first understanding your fundamental
>prototyping requirements, then picking the right tool for the job...
>-----Original Message-----
>From: Doug Bucci
>Sent: Tuesday, March 23, 1999 9:57 PM
>To:; 'Ray Brandes'
>Subject: Re: 1/4-20 thread?
>In response to you & Ray Brandes, I want to build both the male & female
>threads in my jewelry
>that will eliminate my need for commercial hardware & fasteners.
>I am also interested in why you are dissatisfied with the your result of
>building threads in SLS?
>Thanks Again-
>Douglas Bucci
>PS-I would like to thank everyone for their responses.
>My MFA exhibition:
>-----Original Message-----
>From: will pattison <>
>To: 'Ray Brandes' <>; Doug Bucci
>Cc: <>
>Date: Tuesday, March 23, 1999 12:41 PM
>Subject: RE: 1/4-20 thread?
>>i doubt you'll be satisfied with the result making this thread directly.
>> other than with sanders and maybe actua, you will have a hard time
>>creating this thread in any rp machine.
>>you didn't say if it was male or female, but either way, i would
>>a secondary process. if it's female, model in a pilot hole, then drill
>>tap post-build. sls nylon materials machine very well, so you should
>>no problem.
>>will pattison
>>product development engineer
>>4d design
>>-----Original Message-----
>>From: Ray Brandes
>>Sent: Tuesday, March 23, 1999 9:49 AM
>>To: Doug Bucci
>>Subject: Re: 1/4-20 thread?
>>I assume it is a 60deg V thread, but is it male or female? What class?
>>Make the male body .25" diameter to the theoretical sharp point then
>>remove .001 to .002 from the diameter.
>>Make the female the same .25" to the theoretical sharp but add .001 to
>>.002 to this.
>>Does it have to fit an existing part? Can you make it heavy and then run
>>a tap or die on it?
>>Doug Bucci wrote:
>>> Hello, I need to create a 1/4-20 thread in SLS can anyone provide me
>>> with the minimum tolerances for creating this? Thank you,Douglas Bucci
>> << File: ATT00002.html >>
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