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Stesso

Checking Combination Square Accuracy

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1:05
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Combination square uses

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What happens here

Perform a self-check to determine if the combination square itself is accurate. Draw a line along one edge of the square on a flat surface. Then, flip the square over to the opposite side while keeping the head on the same edge of the workpiece and draw a second line. If the two lines perfectly overlap, the square is accurate. If they diverge, the square is not truly square.

Goal: Verify the accuracy of the combination square

Tools and materials

  • Board — A flat, stable surface for drawing the test lines
  • Combination Square Pittsburgh — The tool being tested for accuracy
  • Pencil — To draw the test lines

What they say

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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 down. And just slide it along the edge of your board. You can even slide your ruler out and just use it by itself.

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