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Machine tool with improved spindlehead mounting and traversing means

  • US 4,842,457 A
  • Filed: 08/12/1987
  • Issued: 06/27/1989
  • Est. Priority Date: 09/10/1986
  • Status: Expired due to Fees
First Claim
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1. In a machining center or machine tool comprising a spinglehead carrying a rotary spindle and a driving motor therefor, and means mounting said spindlehead for reciprocatory movement along a rectilinear path under the control of a recirculating-ball screw and nut assembly;

  • the improvement in which the screw of said assembly is rigid with the spindlehead and has its axis passing through the center of gravity of the spindlehead and perpendicular to the axis of rotation of the spindle, said axes intersecting each other whereby the screw axis passes substantially through the point at which the resultant of all the forces and reactions applied to the spindlehead acts, motor means to rotate the nut of said assembly, and means to keep the nut of said assembly axially fixed during the rotation thereof.

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