They are caused by ejector pins. Moldings don’t automatically eject from
the dies and have to be pushed out. I agree they can be a pain, especially in
older dies where you can find flash standing normal to the surface, which has
to be shaved off.
Sent: Sunday, August 07, 2016 12:44
Subject: [STMFC] Circles in Plastic
Just a question here. Nothing we can do about it except fill
them in but, why are there small circular holes or impressions in various
plastic castings? They can't be for material-flow in the casting process
As example, I have several Proto 2000 War Emerg. hoppers (and other
kits) with these holes in the interior slope sheets, etc. Will have to
file/fill them in. Just curious. What are they really for? Would be nice if
they weren't there.
Thanks, Paul Hillman
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