Hi Defiant,
Styrene (.060 for example) works much better than cardboard -- I've tried both. That's what I did for the first few hundred patterns but now I just measure and use a CAD program. It's fairly cheap to buy a sheet of styrene from a plastic supply house even if you only use a tiny section of it. If you make a mistake in styrene just use some PVC pipe glue (also cheap) to add back or correct that section.
Make
sure to use thick enough sheet steel because there is a lot of vibration.
A lot of the people I sell scrapers to have made their own before. You just have to judge what your time is worth plus the cost of materials.
Kind regards,
Kevin
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Originally Posted by Defiant
Piece of cardboard, inverted engine with an assembled bottom-end, cut away the parts that touch and duplicate in sheet steel.
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