RTV Mold, Cured

June 26, 2014

This is the RTV Mold, cured.  I almost liberated the parts but had to get to work.

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The lettering came through very well!

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Since the laser works, I’m using acrylic to cut boxes to use as forms for RTV molds.

Video

https://drive.google.com/file/d/0B5HtJAcoR4PGc0NqOExza3JTNFk/edit?usp=sharing

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Liberating parts from work piece

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Parts unassembled, with paper still on

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Paper peeled off and parts organized for dry fitting

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Parts to be made into mold cavities suspended on wires to center in RTV molding compound

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The acrylic box has been lightly bonded together with an hot glue gun.  Next time, will use masking tape.  RTV molding compound has been poured around the components and is being shown in the small vacuum chamber in the midst of multiple degassing cycles.

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After multiple degassings, the negative pressure is held to help to coax the residual, smaller bubbles.  Without the coherence of a large mass, they move slowly in the compound.  I’ve found a prolonged, light degassing helps to allow the smaller bubbles to make their way up into larger masses.  Once they do, buoyancy shoots them out spontaneously.

20140625_220438I will liberate the parts from the cured mold this evening.