>he should absolutely make a pilot hole in the cad model,
>...
>we all know that there isn't an rp hole out there that is truly round, so i
>always opt for a finish drill.
Yes, I stand corrected. Drilling into a pilot hole and then tapping is
still relatively easy and will give a better quality thread.
>drill the final hole before tapping (a male thread will present other
>challenges, obviously).
But is this true? Can't we accomplish the same thing by fabbing an
oversize post in the correct position and orientation, and then cutting a
thread into it? Hopefully, the post will not be so off-round that a
threading tool (sorry, I'm not sure the technical term for this tool) can't
fit onto it.
Marshall Burns
*****************************************************************
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
E-mail: fabbers@Ennex.com. Web site: http://www.Ennex.com
*****************************************************************
***** Copyright (c) 1999, Ennex Corporation
>-----Original Message-----
>From: Marshall Burns
>Sent: Wednesday, March 24, 1999 8:51 AM
>To: wpattison@4ddesign.com
>Cc: rp-ml@bart.lpt.fi
>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.
>
>
>Will,
>
> 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
>the
>object much more difficult and skill-intensive.
>
>Marshall
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