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I have a big, mean old 4" wide vertical belt sander that I built 25 years ago for cleaning up flame cut hotrod brackets. I also have a store bought 1" delta vertical belt sander. However, I have nothing here that will sand the inside of a curved surface. I have thought about building a 2" vertical belt sander, that instead of a using a flat platen for the belt to run over, would use a 1 1/2" piece of round stock with appropriately tapered ends to use as the platen. This of course assumes that the "belt" would transition from a flat pulley to a curved platen and then back to a second flat pulley. I haven't built one because I don't need one that often---But the thought is there.---Brian
Brian.............wouldn't a 1 1/2" drum sander accomplish the same thing? You've got me thinking about coming up with a mount for my dremel tool....... much like a router table. That would let a person sand an inside radius down to about a 1/4" radius.
What speed motor are you planning to use?