I had a handful of custom Balancemaster balls cast at AEND using a self made ceramic mold which unfortunately broke a few times during the process. Most of the balls had severe flatspots and would be no fun at all to use with a Balancemaster. I learned about centerless grinding and started planning my own machine. My first attempt was built with three separate drills. Plugged into a powerstrip, I thought it should be straight forward to switch the drills on and off. It broke the powerstrip… and controlling the speed was rather difficult. Inspired by old industrial factories where a lot of machines were powered with belt drives, I built a better machine with a single drill and three belt drives. I was finally able to sand the not so nice balls into “perfect” spheres.

The machine was used to sand ten balls and then dismantled.

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