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FEED UNIT

  • US 20170100807A1
  • Filed: 10/12/2015
  • Published: 04/13/2017
  • Est. Priority Date: 10/12/2015
  • Status: Active Grant
First Claim
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1. A feed unit for drilling and/or tapping comprising a housing, a quill in the housing supported for axial movement in the housing between a retracted position and an extended position where a portion of the quill extends beyond the quill housing, a forward end of the quill rotationally supporting a spindle adapted to support a rotary tool outside of said quill, a screw in the housing for moving the quill between said positions, a ball spline shaft in the housing coaxial with the spindle, a ball spline nut on the ball spline shaft, the ball spline nut having recirculating steel balls rolling in raceways on the ball spline shaft with zero clearance in a radial direction, the spindle radially supporting the ball spline shaft within the quill with zero clearance through the ball spline nut, the ball spline nut being fixed to the spindle in the quill whereby rotation of the ball spline shaft is imparted to the spindle through the ball spline nut.

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