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Doing it by hand with sandpaper is a nonstarter.
Also I don't have a lathe :-/
this post was submitted on 16 Jun 2023
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Woodworking
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I'm fairly new at the whole woodworking gig, but I think what I would do is create a negative of the round that you want out of a different piece of wood and then jam some sandpaper into that negative and connect it to my drill.
I've actually tried this! The problem is that the sandpaper is too thick to bend neatly in that tight a radius. Maybe I could buy raw grit and stick it in the cavity with spray adhesive....
You don't want the whole hemispherical cup. Just a semi circle.
The best and traditional tool for the job is a rasp. I recommend a Shinto rasp. Surprisingly fast and easy to use.
can confirm, I have a rasp (Shinto) and I can throw a 1/4 or 3/8 quarter round on an 8 foot edge before you can get your router set up.