Paul, The thinest wall we can drain is .065" to .070" made on an
SLA500 with a gas Laser. My understandin is that solid state Lasers
on SAL5000 have a slightly wider beam and build thicker walls which in
turn increases the minimum wall thickness for proper drainage. To
find the minimum wall you may drain, build a part with varying wall
thickness from .150" to .040". You will be able to measure the limits
after drainage. Some foundries cast parts with walls as thin as
.030" without much problem.
Gary Vassighi
3D-CAM, Inc.
9139 Lurline Ave.
Chatsworth, CA 91311
Phone: 818-773-8777
FAX: 818-773-0979
http://www.3d-cam.com
> -----Original Message-----
> From: Paul Hanna [SMTP:phanna@CESSNA.TEXTRON.COM]
> Sent: Tuesday, December 01, 1998 10:16 AM
> To: rp-ml
> Subject: QuickCast
>
> I am currently trying to produce a QuickCast pattern that has proven
> to be a challenge. As a result, I have a few questions I wanted to
> pose to the list. First a quick overview.
>
> The geometry I am trying to produce is a thin walled (.060 in.)
> pattern. The walls are approximately 11.50 in. tall and are of a
> complex surface design. With the wall geometry being this thin it has
> proven to be a challenge to produce and drain. We have a SLA 5000 and
> are using SL5195 resin. I have been able to achieve a minimum wall
> thickness of .018 in. per side leaving .024 in. for draining but have
> had little success in draining the part. I have been working with the
> Stereolighography process for quite some time but have not had the
> opportunity to produce any QuickCast parts until now. I am working
> with the 3D Systems FSE's testing the boundaries of the QuickCast
> process. They have concurred that this is not an easy part to
> produce. What a way to begin. Understanding the QuickCast process
> such as I do regarding overcure issues, hatch type parameters, laser
> beam technology, etc. we are presented with a couple of questions.
>
> 1. What is the smallest geometry thickness anyone has produced
> with the QuickCast process?
> 2. Has anyone produced an actual casting from this thin of a
> pattern?
> 3. Is the best way to drain this part to use a centrifuge or is
> there something else?
>
> Any help with these questions would be appreciated.
> Thank you.
>
>
>
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