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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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Question for our plastics or molding experts - epoxy casting molds
I'm working on a job where we are epoxy encapsulating some electronics.
My question - what to use for a pilot production mold? Option 1. --------- Aluminum CNC cut pockets Dowels adjacent recess to locate frame that aligns electronics to 0.5mm Release coated mold - PTFE / Teflon? Use release agent? Hope to avoid. Option 2. --------- Plastic mold CNC cut pockets in a ~30mm thick slab Dowels adjacent recess to locate frame that aligns the electronics. Is there a plastic that epoxy won't stick to - no release agent needed? Nylon? UHMWPE? Maybe $$ Teflon? I imagine a silicone or urethane mold may not be rigid enough. Any suggestions? Recommendations? Thanks! Background: Prototypes have been cast in a mold made from epoxy and a aerosol mold release used. It works ok, we ended up making the mold 2 parts as the completed parts were a little hard to remove. *The electronics is sat into a 130mm x 50mm x 20mm (5"x2"x3/4") mold *Their is heaps of draft on the mold for easing release. *Epoxy poured into the mold. *After 24 hours they are de-molded. *These will be made in batches of say 30 to 100 at a time. *We are happy Doing say 6 at a time with a 24 hr turn around. *Mold may be 6 units wide or 6 individual molds. |
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