Drill Chucks

Keyless Chucks (Albrecht, 1908)

  • .0015 runout typicical
  • Some keyless can be wrench tightened.

Key Chucks, Jacob’s Chuck (A.I. Jacobs, 1902)

  • Can be Plain Bearing or Bal Bearing
  • .003 to .004 runout

Drill chucks are used to hold drill bits, not end mills. The force acting on the chuck

Not recommended for holding solid carbide drills. Diamond jaws are available for holding carbide drills.

Jacob’s chuck in a tapered NMTB tool holder

See: Jacob’s Taper