These are some photos of an old Grob belt reduction base that is 
mounted under my 14" Delta bandsaw to reduce the blade to metal 
cutting speed.

The motor has a 2 1/2 in pulley and reduces the speed through two 
10"-2 1/2" combination pulleys finally ending in an 8" pulley on 
the saw.

The motor mount is not original but is probably of a similar design.

The right side of the photo shows the pulley adjustment mechanism.

It drives the saw at about 120 fpm and is not really adjustable.
I could drop out one 10" pulley and get it to run about 500fpm but
that's about it.

It is driven by a 1/4 hp motor. I can and do stop the blade regularly.

The problem is not the motor, but the last reduction. At that belt 
speed (87 fpm) the pulley can only transmit .05 hp or so. If I were 
designing this from scratch, I would use a chain drive at this point.

Although, if were designing this from scratch I think I would use a 
gear reducer.

Paul K. Dickman