CENTER THE MANDREL
This saves a lot of time when centering the mandrel on blocks with bed plates. Using an indicator on the mandrel with stone pressure against the mains, zero the indicator, release pressure with lever. Turn the mandrel 180 degrees, put pressure back against mains, notice what direction and how much the indicator moved. Now roll the mandrel back to zero spot, retract stones via adjustment knob, move the shoes in the direction indicator went, and 1/2 the distance. Roll mandrel to make sure mandrel is within .010 runout. I do this on every block we line hone. It saves time from removing cap to use the centering pins.

Nick Jones
Automotive Machine
Fraser, MI
April, 2020