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Figure 6-9. Counterbore holes must also be drilled into Part M.
What's a counterbore hole? A counterbore hole is a hole that is drilled partially, but not completely,
into the wood. It allows a bolt's head, when inserted into the hole, to sit just below the flat surface of the
piece. This helps prevent two moving pieces from scraping (or stopping altogether) against one another.
Figure 6-10 shows an example of a bolt inserted into a counterbore hole. Notice how the bolt head sits
below the surface and will not be felt if you drag a flat piece of wood across the part's face. For Part M,
these counterbore holes will allow the motor to sit flat against the part and still contain enough material
for the screws to fasten to the part below.
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