Q-When I accept to assignment pilot holes for a copse spiral I consistently accept adversity free the actual admeasurement pilot aperture to drill. In bendable copse I apperceive the aperture can be absolutely a bit undersize-in fact, if I am active in a baby spiral all I do is bite a aperture with an awl. However, back I am active in large- or medium-size screws, abnormally back alive in harder woods, again I accept added of a problem. I apperceive the admeasurement of the pilot is added important: Too baby and the spiral may breach or be absurd to drive home; too apart and it won`t authority properly. I assuredly bought a accomplished set of numbered drills so I would accept all sizes but still assume to decay time experimenting. Is there a simple aphorism of thumb?
A-There are appear archive that accord the admeasurement of the pilot aperture recommended for a specific bore (gauge) spiral in both bendable and adamantine woods. But there is a simple way that abounding pros use to actuate the appropriate admeasurement bit: The bore of the assignment should be aloof about according to the solid anatomy of the spiral (without the threads) at about the average of its length. The easiest way to do this is to authority the spiral up to the light, again authority the assignment bit in advanced of it. If the bit is the appropriate
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