Gage head for in-process gaging in machine tool

摘要

892,033. Grinding. CINCINNATI MILLING MACHINE CO. Jan. 8, 1960 [June 24, 1959], No. 719/60. Class 60. [Also in Group XIX] A machine tool comprises a forming member 12 such as a grinding wheel, means 60 to drive a workpiece 20 in an operating position, a gauge head having a body portion 29 pivotally mounted adjacent the operating position of the workpiece and means 42 connected to the body portion and adapted to engage the workpiece in the operating position to locate a sensing element 51 carried on the body portion in fixed relation to the means 42 to detect movement of the workpiece surface relative to the sensing element. The body portion of the gauge is pivotally mounted on an adjustable support 25 mounted on the machine slide 10 and is formed with a pair of arms 31, 32 each of which carries a sensing element consisting of a tubular member 51 carried by a sleeve 47 secured to an arm and connected by gauges 56, 57 and variable restrictions 55, 58 to a source of pneumatic pressure. The machine has a pair of arms 14, 15 which operate to remove a finished workpiece from, and at the same time carry a workpiece to be ground into, the operating position. During this movement away from the operating position, the finished workpiece pivots the gauge head to an open position where it is retained by a spring detent 37 until the new workpiece engages the sleeve 47 on the arm 31 and moves the body portion towards its operative position. The new workpiece continues its movement until it contacts an adjustable support 62 and the locating means 42 which it engages at at least two points C, D. The locating means positions the sensing members equidistant from the surface of the workpiece. The ends of the sleeves 47 are slotted and adjusted by screws 50 to a position approximately 0.0025 inches from the workpiece surface. The ends of the members 53 are approximately 0.0005 inches from the ends of the sleeves. The workpiece is rotated by a magnetic chuck 60, the axis of which is displaced from the rotational axis of the workpiece so that the latter is constantly urged against the locating means 42 and support 62. As the workpiece is ground, its size is indicated on the gauge 57 and when its finished size is reached, the pneumatic system may automatically control the retraction of the grinding wheel or some other function. In an alternative embodiment, the sensing element consists of a finger 153a, Fig. 7, which engages the surface of the workpiece and controls a variable restriction.