Wheelhead 1 travels along the ways of base 2 and is rigidly attached to piston 3 which is subject to the pressure of fluid in the cylinder. Fluid is admitted to the cylinder through tube 4 and valve spool 5 which is shifted by handle 6. The fluid flow can be switched over by handle 6 so that grinding wheel 9 is retracted from workpiece 10 (in internal grinding as shown). The wheelhead is set into the required position by handwheel 7 and screw 8.
$3768$SHP,FD$