Whether it's speed square, combination square, or framing square, you count on the tool to accurately measure 90-degree angles. But, how do you know if the square is square?
Easy!
Place one leg of the square or its reference edge along the straight edge of a board or piece of plywood. Mark a line along the other leg, then flip the square from side to side and place it along the straight edge once again. Align the other leg about a 1/4" (or cm) from the line you just made, and draw another line. If the lines are parallel, your square is fine!
If not, it needs adjustment. In the case of a framing square, check out this episode where we show you how to make the adjustment:
Be sure to visit www.dirtfarmerjay.com/blog or /shop for great content and merchandise!
JUST DO IT YOURSELF!
Hey, Dirt Farmer Jay here from DirtFarmerJay.com. You've got yourself a square like this, a speed
square, maybe a combination square, or even a framing square. But how do you know that it's
really squared, 90 degrees? Easy. Put it on a known straight edge. I double-checked this for
straight. Place it on the edge here. Draw a line along the side. Flip the square over, move it,
and then place another line about an eighth to a quarter inch apart. This doubles any error in the
square. It makes it very visible, and you can see whether or not your square is perpendicular. Mine
is good. If this wasn't, I'd either have to grind it or throw it out or start over. Hey,
if you found this to be helpful, check us out at DirtFarmerJay.com forward slash blog for great
insights on the home, the shop, and the garden, or forward slash shop for some great merchandise.
Check us out on the rest of our videos. Thanks for watching. This is Dirt Farmer Jay from DirtFarmerJay.com.
