Doug Proper designed a sanding jig that supports variable concave and convex curves, described in the following Loothgroup article:
https://loothgroup.com/post-imgcap/the-variable-radius-sander/
I built one and am impressed with how it facilitates preparing bridges, braces and also allows tracing any radius using the chord formula. I made a rough measured drawing and assembly guide to share, with Doug's blessing.
First step, ma…
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