Engine_2014 : General Subjects - 1425/3524
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| 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 __________ . |
| A) slightly larger than the web thickness of the larger drill |
| B) equal to at least 1/2 the diameter of the larger drill |
| C) smaller than the dead center of chisel edge of the larger drill |
| D) small enough to ensure the maximum cut by the larger drill |
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