Belt grinder advices

[rendoman]

Hi all!
My uncle gave me some old but good engines, among which one 1,5hp - 2800 rpm, I'm thinking about building a belt grinder. I found on local flea market some abrasive belts, from 6cm to 12cm (2,3" - 4.7") various grit, very long.

My idea is to replicate a belt grinder with 4 pulleys, like kms (is that the name?) or like many good project seen on this forum.
I got a few doubts concerning diameters and width of the wheels:

- I havn't understood the use of large or small diameter in the final "cutting" wheel. I see very big, or couple of wheels (usually one bigger than the other) with a flat support, or smaller single one.

- If you need to build a belt grinder, which width of belt you should take? It may be worth building large width wheel (12cm)? Or It can be better make wheel for 6cm?

-Adjustable wheel for centering I see has "tip", I can immagine something between 5 and 10 degree, It can be useful?

- engine pulley diameter, as I understand it, it's only related to speed of the belt. For steel speed should be around 25-35 m/s and something less for wood. If I attach the first wheel at the shaft of engine, with 2800 rpm I should use some 150mm (6") or more in order to obtain cutting speed of something more than 20m/s.
...or maybe I should use a couple of pulleys to decouple engine and change speed? I think it's the right choice.

I'm searching for 6003 bearing, hope it's a good choice. I want also to add a cotton polishing arm

What do you think about?