Recommended operating speeds (RPM) Accessory Softwood Hardwood Acrylic Brass Aluminum Steel Shop Notes (Pine) (Hard Maple) Twist drill bits* 1/16″ – 3/16″ 3000 3000 2500 3000 3000 3000

Lubricate drill with oil when cutting steel 1/8″ or thicker. Use center punch on all holes to prevent drill from wandering.

1/4″ – 3/8″ 3000 [...]