Measuring With a Shaft Key
...ved, square and tapered. We’re looking for the square ones. Every hardware store has a set of shaft keys in a dusty, seldom opened drawer. My local store carried shaft keys between 1/8″ and 1/2″. You can buy a whole set for mere dollars. I used a sharpie to mark the dimensions of my set of shaft keys. I use them mostly for setting the depth of my router and table saw. Using your sense of touch, aided by a shaft key, is much more accurate than usin...