Re: Knob casting experiments
Hi David,
Very interesting post, I have dabbled in making new knobs in a similar fashion, I used some 2 part silicone rubber moulding compound, which is excellent stuff for getting all the fine detail, and some polyester resin to cast the final part. I've had some good results with it, but I think that I could do better, especially if I built a jig like yours!
One thing I do to reduce the effects of bubbles is to mould the item upside down, so the most visible face of the knob is uppermost, that way the bubbles don't settle on that surface while the silicone goes off, then when casting the final part turn the mould so the face of the knob is facing down, then any bubbles in the resin end up at the back out of the way.
I've got a knob from an Ekco U76 to cast, I've already made the mould just need some resin to do it!
Regards
Lloyd
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