When drilling holes larger than 1/2 inch, drilling a smaller hole first is a good practice. This is called a pilot hole, and the pilot drill should have a diameter __________.

Question

Accepted Answer

slightly larger than the web thickness of the larger drill

Answer

smaller than the dead center of chisel edge of the larger drill

Answer

small enough to ensure the maximum cut by the larger drill

Answer

equal to at least 1/2 the diameter of the larger drill

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