A reduction in speed and feed to reduce the amount of heat is generally required in most deep-hole applications where coolant cannot be effectively applied.

Holes which must be drilled three diameters deep or more fall into the "deep hole" drilling class and some adjustment of feeds and speeds is necessary.

Peck drilling, or the practice of drilling a short distance, then withdrawing the drill, will often reduce the chip packing.  The deeper the hole, the more frequent the drill must be retracted (or pecked) to be effective.

Direct additional speed and feed questions to Discount-Tools.com at (714) 751-3844 or Fullerton's technical department at 1-800-248-8315.

The deeper the hole, the greater the tendency there is for chips to pack and clog te flutes of the drill.  This increases the amount of heat generated and prevents the coolant from cuducting heat away from the point.  A buildup of heat at the point will eventually result in premature failure.