EASY SET SCREW
This is an easy way to align a pulley or sprocket, when drilling and tapping for a set screw on the key. Suspend the pulley (or sprocket) on a length of key stock, supported and by vise jaws. Tighten the vise to secure the pulley. Center over the keyway by probing or edge-finding both sides of the key stock. Slide the key stock out, to remove before drilling and tapping pulley or sprocket for a set screw. 1-2-3 blocks can be used atop the vise jaws to accommodate larger diameter pulleys. Also, a variation of this technique can be used to align the pulley for a set screw placed 90° to the keyway.

Tom Nichols
Automotive Machine & Supply, Inc
Cleburne, TX
March, 2024