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Drill without damage

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1. Start with the right bit
3 bits together
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You'll need all three bit styles - twist,
brad-point, and Forstner -- to drill
tear-out-free holes in a range of sizes.

1. Start with the right bit

Do-it-all twist bits are inexpensive and designed to punch through wood, metal, and plastics. To achieve this versatility, manufacturers typically grind their cutting tips to 118°. This shallow angle can allow the bit to wander on entry and blow out wood fibers on exit, so reserve twist bits for plastic, metal, and holes smaller than 1/8" in wood where the small size minimizes those tendencies.

For holes sized from 1/8" to 1/2", instead select a brad-point bit. The center point of a brad-point bit prevents wandering on entry, while the sharp outer spurs shear the wood for far less tear-out.

When you need to drill holes larger than 1/2", move up to a Forstner bit. Like brad-point bits, Forstners feature a center guiding point and cut very clean holes. Multispur Forstner bits, like the one shown right, add sawlike teeth to the rims, which cut more aggressively without sacrificing cut quality. When using this type of Forstner, slow the feed rate, and secure the workpiece with clamps.

Continued on page 2:  2. Back up your cut


Comments (1)
hollowkb wrote:

For the small twist bits, keep an ice pick handy to mark the start point- no slip. Karen

8/20/2015 06:20:27 PM Report Abuse

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