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Numerically controlled grinding machine

  • US 4,662,122 A
  • Filed: 02/21/1986
  • Issued: 05/05/1987
  • Est. Priority Date: 03/29/1985
  • Status: Expired due to Fees
First Claim
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1. A feed controller for a numerically controlled grinding machine wherein a fast forward mode, an air-cut feed mode and a grinding feed mode are sequentially performed to effect relative feed movements between a grinding wheel and a workpiece through different feed amounts at different feed speeds, respectively, said feed controller comprising:

  • a contact detector for producing a contact signal upon contact of said grinding wheel with said workpiece;

    air-cut feed remainder detection means including a counter responsive to feed command pulses for detecting a feed remainder in said air-cut feed mode based upon an air-cut feed amount predetermined for said air-cut feed mode and an actual feed amount through which said relative feed movement in said air-cut feed mode is effected until said contact detector generates said contact signal, each of said feed command pulses being indicative of a unit feed distance in said relative feed movement between said grinding wheel and said workpiece; and

    feed mode change means responsive to said contact signal from said contact detector for changing the feed mode of said relative feed movement in such a manner as to effect said relative feed movement through said feed remainder at a slower speed than an air-cut feed predetermined for said air-cut feed mode.

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