STEP 1: Using a pencil and ruler, draw a horizontal line. Set the compass to the width of the line. Place the compass at either end of the line and draw two arcs that cross in the middle.

Then, the pencil and square glide smoothly together down the wood as you draw a perfectly straight line. To create the notch, take apart your combo square so you are holding the ruler. Stabilize ...

Drawing lightly will make erasing easier. Add a vertical line signifying a corner Using a ruler, lightly draw a vertical line ...