GB1019406A - Concentricity and perpendicularity gauge - Google Patents

Abstract

1,019,406. Concentricity and perpendicularity gauges. Aug. 24, 1964, No. 34494/64. Heading G1M. In a gauge for measuring concentricity and perpendicularity there is provided a housing 14 having an annular pilot portion 24 and three bearing bores 44, 46, 48 mounting motion transmitting rods 56, 106, 174, and having indicator dials 16, 18, 20 mounted on the housing whose plungers 54, 104, 168 are in operative engagement with the rods 56, 106, 174, an internal surface concentricity feeler 76 movably mounted in engagement with rod 56, an external concentricity feeler 156 in operative, engagement with rod 106, and a perpendicular surface contacting feeler portion 188 engageable with surface 86. Rods 56 and 106, are in operative contact with pivotted feelers 68 and 148 respectively, whereas rod 174 contacts the workpiece directly at 88. The feeler 148 is urged by a spring 158 to a position such as to prevent damage during insertion into the workpiece. Pushbutton means 136, (see Fig. 1, not shown) releases the feeler when it is required for a gauging test. The gauge is fitted into the workpiece W by an expansible arbor 22, comprising a head 200 mounted on a stem 202 positioned in counterbore 203 of the bore 24. The head 200 carries a pilot portion 24 which is expanded hydraulically through rotation of handle 208. The stem 202 is locked by engagement of the end 228 of a spring-loaded plunger 234 in a notch 226. In operation, the gauge is lowered on to the workpiece W, depressing pushbutton 136 to withdraw the tip 156 out of contact with the workpiece W. The arbor is then expanded to grip the reference bore 82. Subsequently the holder 12 is rotated by handle 32 causing the three gauges to be operated simultaneously i.e. tip 78 traces the internal surface, tip 156 traces the external surface and tip 188 traces a path against the flange 86. These movements are recorded on the respective dials 52, 98, 166.