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Scribing Parallel Lines

0:20
1:05
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At 0:20 in

Combination square uses

What happens here

Demonstrate how to accurately scribe a line parallel to the edge of a board at a desired offset. The user sets the ruler's head to the required measurement (e.g., one inch from the edge) and locks it in place. Then, they slide the combination square along the edge of the board while holding a pencil against the ruler to create a consistent, parallel line.

Goal: Mark lines parallel to an edge at a consistent distance

Tools and materials

  • Board — The workpiece on which to scribe the line
  • Combination Square Pittsburgh — To set the offset and guide the pencil
  • Pencil — To draw the parallel line

What they say

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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. But, what if you need to measure the depth? Put your head on the piece, push your ruler down, lock it in place. That depth is the same across this whole

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