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Old 8th Jun 2010, 12:33 pm   #22
Aerodyne
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Join Date: Jun 2004
Location: Hampton Vale, Peterborough, UK.
Posts: 1,642
Default Re: Copying a control knob by moulding

A couple of points from the messages on this thread:
1. Certainly it is expensive to purchase the materials for a 'one-off' and if it is feasable and the price is no deterrent, having one or two made to order would seem to be the optimum method for the single occasion. It might be that the maker would require an original knob to copy, though. This could be a problem. Enquiries to David's source would help determine the facts.
2. Resin castings will shrink, but there are some resins formulated for minimum shrinkage so it pays to check manufacturer's literature, available from most of the retail sources on the web.
-Tony
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