Making convex radius blocks

[jammy]

Im looking to start doing small scale luthiery as a bit of an extra cash earner (just setups, re-wires etc...) and I need to get a shure fire way of doing scallops well each time. I was talking to Jeremy (LGM guitars) about it and he said he uses pre-radiused sanding blocks and has one for each fret.

I would like to know of a way to make radiused blocks in an accurate way (LGM just beltsands them, which is fair enough, but I want to know if a more accuate way is possible) down to very small radia (about 0.7 cm I expect). See what you guys can come up with!

Thanks in advance

[feylya]

Well, I imagine it would be possible to make a jig like Brian did for making Concave radius blocks except make the router stationery and move the piece of wood. Wouldn't be too hard to make tbh.

[jbkim]

What about dowels?

[krazyderek]

for the smaller frets a half rounded file or "dowel"(?) file might be easier then trying to make such a small block, or just use a wooden dowel and wrap sandpaper around it.

for making the other blocks just do like feylya said and reverse the rolls in the "making radius sanding blocks" tutorial so that the peice of wood is swinging past the router, and the router is stationary.

gl!