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FIGURE 8A

Drill Modification – 60˚ Tip Angle

Grinding Wheel

Both wheel and drill are rotating.

60°

Wood or Metal Bushing

Chuck

FIGURE 8B

Drill Modification – 0˚ Rake Angle

Grit Wheel

Section to Be Removed

FIGURE 8C

Drill Modification – Clearance Behind Cutting Edges

Note angle

GENERAL DRILL SPEEDS

Diameter

Speed-RPM

.060"

3000-4500

.125"

1500-4500

.187"

1500-4500

.250"

1800-2000

.312"

1500-2000

.375"

1500-2000

.437"

1000-1500

.500"

800-1000

.750"

500-800

1.000"

500

FEED RATE OF .015"-.020" Per Revolution

15

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