We have built Quickcast parts of an open box approximately 7in.x4in.x5in. with wall thicknesses around 0.050 in. These parts did not drain very well either, but Solidiform was able to successfully cast them anyway. Depending on the geometry of the part, they may be able to cast them almost solid. I think this is possible because the volume of the solid material is so small relative to the surface area that the expansion during the burn-out process is not great enough to crack the ceramic shell.
Joe Paxton
Sr. Research Associate
Center for Automation and Robotics
Research Institute, Rm A11
University of Alabama in Huntsville
Huntsville, AL 35899
Voice: (256) 890-6243 x208
Fax: (256) 890-6970
Email: paxtonj@email.uah.edu
-----Original Message-----
From: Paul Hanna [SMTP:phanna@CESSNA.TEXTRON.COM]
Sent: Tuesday, December 01, 1998 12:16 PM
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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