All,
In reference to Dave and Rusty's discussion, it is called lost plastic
casting for a very good reason. You get a 1 plastic part for 1 brass casting
- period. The plastic part (hopefully) gets completely consumed in the
process. As Rusty mentioned plastic ash can get left behind making for a
less them wanted casting.
There are many advantages to lost plastic. In my opinion you can get much
smaller very crisp castings that would be difficult to make in regular lost
wax casting. You also can make shapes not possible because of the mold
parting line. In Solidworks I made a rather complex RS3 end handrail bracket
with a wandering M U conduit. The material that the masters were printed in
was supposed to be able to be burned out but there were some problems. The
end result was I got the complex parts but have some filing and surface
finishing to do first.
The obvious disadvantage is if you are hand making a complex plastic master
you probably do not want to do lost plastic. The plastic master will be
destroyed and there is always a chance that the part will not cast well.
Rubber molds can be made from plastic masters for conventional lost wax
casting. You should have some understanding of the process and where the
mold parting line is going to be before making the master pattern. You can
get a "trapped entity" which makes the part very difficult or not possible
to cast.
I hope I answered the question..
Still live in Duluth where some interesting late night conversations about
Wisconsin Cheese and brew pubs happened last night.
Bill
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