Belt grinder advices

[Toolmaker51]

[QUOTE=rendoman;67793]I'm thinking about use some high density polipropilene as bel support on the double wheel final part, or maybe it's better steel?

I'd tend toward poly/ urethane/ or non-metallic wheels to reduce inertia and heat retention. Aluminum tube with a plastic liner for bearings might work too.

Next work will be build the wheels on lathe, don't know if making them straight, or with double angle, it can help?
The tracking adjustment wheel might look flat, ok for regular speeds. Most have a very large radius, not a pair of angles, that's what stresses the belt. Crowned sheaves are used on things like toolpost grinders; high rpm, rubber with cords and 'no' stretch, perfect alignment and the crown keeps belt centered.