I replaced my bandsaw’s steel guide blocks with graphite-impregnated phenolic blocks (Cool Blocks). For accurate operation, the blocks’ faces should be routinely dressed to remove regular wear. I tried freehand filing and sanding, but had a hard time keeping the ends square with the edges.
To solve the problem, I made this simple jig. It’s a 3/4 × 2 × 6" scrap of hardwood, with a notch sawn in the end to snugly accommodate a guide block. A 1/8"-thick end-strip screwed to the scrap secures the guide block in place. (If necessary for a snug fit, wrap the block with masking tape.) To smooth and square the blocks, position them in the jig so that they project just a bit from the bottom and rub the whole thing over 150-grit and 220-grit sandpaper until the ends are flush with the bottom of the jig. It’s best to do this on a dead-flat surface, like a saw or jointer table. To dress guide blocks with a 45° face, I bevel-cut the opposite end of the jig before notching it.
