RE: 1/4-20 thread?

From: Tom Richards (
Date: Wed Mar 24 1999 - 22:53:57 EET

Thank you for the feedback. Can you machine these threads in Trueform?

At 09:50 AM 3/24/99 -0600, you wrote:
>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 >>
>>For more information about the rp-ml, see

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