Crankshaft Polisher from HF Sander
I was lucky enough to purchase a production crankshaft polisher off craigslist for a reasonable price. My friend JB Castagnos had purchased a crankshaft grinder some time back and was in need of a polisher. I decided to build him one using mine for a guide.
I purchased a Harbor Freight 60543 1" X 30" Belt Sander, removed the base plate, table, and covers. Cut out the mid section along drawn lines, leaving the top and bottom radius for strength. Bent a piece of square aluminum tubing 3/4" OD X .125" X 5', and attached it to the motor side of sander frame for alignment and strength. Attached a piece of 1" steel square tubing with 1/4 nuts welded on for adjusting knobs to top roller section with countersunk screws. The steel tubing overlaps the side of the top roller section to compensate for alignment with base. The handlebar is simply bent 1/2" conduit clamped in a micarta block that was drilled and cut in half. Hardwood or aluminum could also be used and the angle is adjusted for balance. Assembled, the rollers are a little offset from centerline, this is how my factory built polisher is also.
I am really happy with how it works and was built on a very small budget in a short time.
JB Finishing a Fairbanks piston pin with polisher.