Drills

Drills typically machine with 3,000 to 5,000 rpm (Revolutions Per Minute). Drills dredge away material, and that places great demands on sharpness and geometry, workpiece support and feed rate.

The helix angle is significant for the drill's ability to empty the hole for chips. Furthermore, the helix angle is important for the direction of the chip pressure when going in and out of the material.

When the feed speed is too high in relation to rpm, spiral and chip space, an enormous chip pressue occurs.

When drilling in a CNC spindle, we recommend emptying the spiral before drilling through the workpiece. In this way, the chip pressure will ease. After emptying the spiral, you go slowly through the workpiece at low feed rate.

The performance of the drills and the tolerances of the holes depend very much on the drill geometry and the chosen cutting data.

Other very important factors are stability and precision in drill shafts and drill chucks. Furthermore, the compressed air cylinder behind the drill spindle must be stable and sufficiently strong.

With the correct cutting data and the right selection of tools, you achieve:

• Higher productivity
• Lower cost per hole
• Fewer rejects
• Higher profits