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Plus on very coarse belts, it can crack the surface of the belts.
That's also why you should never run a new 36 grit belt over a 3/4" roller. The surface cracks and the belt degrades pretty quickly.

Just be aware that a treadmill motor is typically not very strong. You can use it to build a sander but be careful to not bog down the motor too much because that will burn out the coils. As long as...

On this one, the platen are exchangable with a variety of contact wheels.
If you'd use a contact wheel you'd have a lot of slack belt.

I haven't made one yet. It's on my to do list. I hope to have made some progress by the end of the year :o

It's funny though: beltgrinders like the bader and the kmg are sold without problems in...

I have attached a complete set of mechanical construction plans for a KMG style grinder to this post.
Special thanks to Michael Clerc for allowing us to share these plans.

I read an early version...