I have a 1/2 HP motor with a 1/2" shaft. I use it for all sort of
purposes by attaching wire brushes, buffing wheels to it, etc. Also a
diamond bringing wheel with diamond layer on the outer rim.

What I would also like is to find some sort of a "disk sander
attachment", basically a plate that would go on a 1/2" spindle and be
tightened with an allen wrench. Alternatively it would be a wheel that
would go on a wheel arbor adapter (which I also have).

My question is, what are these discs called officially (disc sanding
attachment? sanding plate? etc) and what size would you recommend for
a 1/2 HP motor. Seems like 8" would make sense.

thanks

i