Here is some simple relay logic for automating a manual surface grinder with the aid of a 
small 3-phase AC motor (geared down) and a hand-ratchet controlled with an air 
cylinder.

Not shown is the use of a double acting air-solenoid (directional valve).

surface_grinder_logic_00.txt

Matt Isserstedt
21 Dec 2005
mattofvinings AT aol.com