Download video: Building a Disc Sander (cheap and simple)
Channel: Cosmas Bauer
TIP: Right-click and select "Save link as.." to download video
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It's powered by a 1.6hp electric lawn mower motor.
The disc is made from phenolic resin coated plywood and attaches to the motor shaft via friction.
Don't try this at home! You could damage your gel nails!