REFILLS
When balancing a crankshaft for heavier parts, often you must add metal in an existing hole. If the hole was drilled with a regular drill bit, versus a spade drill, the hole can be irregular and oversized. It can be time consuming to try to make a slug that fits the irregular hole. I cut an appropriate piece of cold rolled steel of the closest diameter, for the weight to be added. Next, heat it up cherry red. Drop it in the hole and use your air hammer with a blunt round end to work the piece from the center out, to fit the hole snugly. Finally, weld it in place. Always add a little extra for “fine tuning”. 

Ron Flood
Cedar Machine
North Branch, MN
FEB, 2022