Re: Large Epoxy Granite Vertical CNC Mill
Originally Posted by
petruscad
On the precision mold topic.
The way they create precision is by applying a thin layer of epoxy-based paste (e.g. moglice) to the place where precision is needed and then lowering a straight edge or surface plate on top of it in a very precise way. Injecting liquid filler between the rough base and the precise surface is another way. After curing the reference plate/edge is removed revealing a precise surface behind (this is why its called replication).
How do they remove the surface plate, or rather, is there a trick to easily removing a surface plate like that from the cast surface?
So far my experience suggests that separating two super stiff objects that have one surface cast together are very hard to separate.
No matter how well a separation wax has been applied, there is zero room between the two surfaces and since bending is not possible the entire surface has to release more ore less at once.
Sven
http://www.puresven.com/?q=building-cnc-router