Checking Squareness of Corners

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Combination square uses

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What happens here

Demonstrate the fundamental use of a combination square for checking both inside and outside corners for perfect 90-degree angles (squareness). The user places the square against the inside corner of a wooden frame and then against an outside corner to verify that the angles are true.

Goal: Verify 90-degree angles on a workpiece

Tools and materials

Combination Square Pittsburgh — To check the squareness of angles
Wooden Frame — The object whose corners are being checked

What they say

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You're probably only using half your combination square. Here's what else I can do. Let's get after it. Obviously, you can check inside corners and outside corners for square. You can also mark 90s and 45s. But, how do you know that your square is actually square? Draw a line, flip your square, and draw another line. If these lines don't match up, something's off. Now, say that you need to line an inch in from the edge of your board. Set your measurement and lock it

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