You are here

Check the mirror for boring true and square

Most of us believe that mirrors don’t tell the truth on their best days. But when I need to drill a perpendicular hole and can’t use a drill press (such as in the middle of a large workpiece or on a wall), I use a piece of mirrored acrylic with common hole sizes predrilled through it. When the image in the mirror and the drill bit align, the hole is perpendicular. Just be sure to view the bit from both front-to-back and side-to-side orientation.

I keep my drill mirror in my toolbox. To avoid scratches during storage, I made a cardboard sleeve.
—William Shockey, Portland, Ore.

Read more about

Tip of the Day

A simple jig for grooving short dowels

Carefully fitted dowels will trap both air and excess glue when inserted. Unless you provide an... read more