FW: Tooling Resins vs. SLA

From: Bruce Okkema (bruceo@eagledesign.com)
Date: Sat Nov 22 1997 - 15:24:57 EET


-----Original Message-----
From: Bruce
Sent: Thursday, November 20, 1997 4:24 PM
To: rp-ml@bart.lpt.fi; rp-ml@bart.lpt.fi; rp-ml@bart.lpt.fi; rp-ml@bart.lpt.fi; rp-ml@bart.lpt.fi; 'Ingrid Timmel'
Subject: RE: Tooling Resins vs. SLA

----------
From: Ingrid Timmel[SMTP:a055328@fpu013.fpp.com]
Sent: Thursday, November 20, 1997 1:40 PM
To: rp-ml@bart.lpt.fi; rp-ml@bart.lpt.fi; rp-ml@bart.lpt.fi; rp-ml@bart.lpt.fi; rp-ml@bart.lpt.fi
Subject: Tooling Resins vs. SLA

"What is the major advantage of making a SLA mold for injection parts over
casting a mold from heat-resistant epoxy ?"
1. One major advantage is being able to build both/all parts of the mold simultaneously which is not possible when casting from a model of the part.
2. In a case where the model has a lot of mass an SLA shell mold could be less mass and
     faster to build than a model.
3. If one needs a mold it may be better to invest time in building the mold directly rather
     than spending time on a model as a means to a mold.
"It takes less time to make, clean up the part and cast the mold, than it would
to set up everything for making a mold from SLA."
In some cases, this is true. However, each project needs to be planned based on design requirements and criteria. For example: We do not consider SLA tools for production runs of more than 300 parts or that may require high injection temperatures and pressures in hostile materials; nor do we consider epoxy tools if we need only 25 parts.

In our experience there is perfect justification for the use of both methods.

Kind Regards,

Bruce Okkema
Eagle Design & Technology, Inc. Ph: 616-748-1022
2437 84th Ave Fx: 616-748-1032
Zeeland, MI 49464 E-mail: bruceo@eagledesign.com
USA Web: www.eagledesign.com



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