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1 X42 belts are cheap and available in many grits from low grit ceramic belts to micron graded belts.

I have not thought of making it a 72", that would be too complicated. I still use the grinder...

The set up works well, it does not finish as nice as a softer contact wheel but it does an adequate job. It works fine to about 120 grit. With the relatively high belt speed it heats up to quickly...

Here is a picture of the curved platen that I made for my 1X42 belt sander/sharpener. It works pretty well with the cooler running lower grit belts. It is 1” wood with sheet metal tacked to the...