Outlining the Octaves
Now, from the left edge of the blank measure exactly 6 ½” [165.1mm] and draw a line from the front edge of the blank up to line LM. From the line you just drew, measure exactly 6 ½” [165.1mm] to the right and draw another line. Do this two more times until your keyboard blank looks exactly like the illustration below. Triple check to be certain the lines are exactly 6 ½” [165.1mm] apart. Draw these lines using a speed square to be certain they are at 90 degrees to the front edge of the keyboard blank.
