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Unread 05-14-2003, 02:07 PM   #29
utabintarbo
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Join Date: Jul 2002
Location: Sterling Hts., MI
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Quote:
Originally posted by Since87
...

I'm not understanding the purpose of the ejection mechanism. Would you elaborate?
Well, the problem with little bitty pieces like those nozzles is that they tend to bind in the mold. One way to stop this from happening is to create a mechanism to "push" the piece out. That is what the ejection pin does. Also, there is enough space around the pins that air bubbles have someplace to go, yet not enough so that the plastic can follow. (Air is relatively non-viscous.)

The other way is to draft (angle) all "vertical" walls so the piece essentially "drops" out of the mold. That might be a problem in this application, since that would restrict water egress from the base plate.

Bob
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