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Marking 90-degree and 45-degree Lines

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Speed Square Mastery: Stop Using It Wrong

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What happens here

The most common uses of a speed square involve marking precise 90-degree and 45-degree lines. To mark a 90-degree line, place the fence of the Milwaukee speed square against the edge of a wood block and trace along the straight edge with a yellow carpenter's pencil. For a 45-degree line, align the 45-degree edge of the speed square with the wood's edge and trace. This technique is simple and effective for basic angle marking.

Goal: Accurately mark perpendicular and diagonal lines on wood

Tools and materials

  • Milwaukee Speed Square Milwaukee — Guiding the pencil to mark lines
  • Yellow Carpenter's Pencil — Marking lines on the wood
  • Wood Block — The surface to be marked

What they say

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speed square has a few different uses, a lot of different uses and we're going to go through them right now. So the first use of a speed square and the most common use is your 90°. So go ahead and put your fence up against there, trace [snorts] that, and that's your 90. The second use of it is a 45. Simple. This is a 45 and this is a 90. All right, so the second use of a speed square is scribing a line. So all these

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