RE: 1/4-20 thread?

From: will pattison (
Date: Wed Mar 24 1999 - 17:06:25 EET

he should absolutely make a pilot hole in the cad model, but he should
drill the final hole before tapping (a male thread will present other
challenges, obviously). this is especially true with a small thread form
like he wants. he might get by with making the nominal hole directly, but
we all know that there isn't an rp hole out there that is truly round, so i
always opt for a finish drill.


-----Original Message-----
From: Marshall Burns
Sent: Wednesday, March 24, 1999 8:51 AM
Subject: Re: 1/4-20 thread?

>... 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.


    Wouldn't it be better to include at least the hole geometry in the CAD
design so the fabricator can create the object with the hole in the right
position and orientation? Then tapping can easily add the thread. If you do
both drilling and tapping manually, you are making the process of making
object much more difficult and skill-intensive.


Marshall Burns, President
Ennex(TM) Corporation
Fabbing the Future(TM)
10911 Weyburn Avenue, Suite 332, Los Angeles, U.S.A. 90024
Phone: +1 (310) 824-8700. Fax: +1 (310) 824-5185
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