2x72 Belt Grinder Question

What are the serrated wheels used for? I see some have both a wheel and a platen.

I have often wondered the same thing, hopefully someone will give an answer.

This is something the knifemakers would be able to answer best. From what I understand, serrated wheels are supposed to be better for roughing. They are also supposed to run cooler, extend belt life and track better. I know a custom knifemaker and he tells me that he prefers a smooth belt because it finishes better and he has no trouble with tracking or belt life. He also told me that KMG, the machine he uses, no longer sells serrated contact wheels because they create a coarser finish.

I don't know enough about this to be helpful but I can say this. A smooth 8" contact wheel on a KMG will flat out eat steel amazingly fast!

All belt sanders need a platen. Not all have a contact wheel.

I suppose for general fabrication use a contact wheel along with a platen would be desirable.

Actually, I think a contact wheel and a platen would be ideal.

The AMK might be the ticket then.