GB895154A - Improvements relating to apparatus for gauging dimensions of workpieces - Google Patents

Abstract

895,154. Gauging departure from standard form. ROLLS-ROYCE Ltd. April 6, 1960 [April 13, 1959], No. 12530/59. Class 106 (2) [Also in Group XX] Apparatus for gauging dimensions of a workpiece W comprises a table 10 provided with a plurality of indicia 18 equally spaced angularly, a pivoted bar 20 which may be clamped in any angular position, a support 25 sliding on the bar and capable of being clamped to it, and a universally movable probe 62 carried by the support 25. Angularly spaced around the table 10 are six slots 11 in which slide locating bobbins 12. These may be clamped in any desired position. The indicia consist of a number of holes 18 angularly spaced every ten degrees and the bar 20 is pivotally mounted on a pin 17 in the centre of the table. The bar may be clamped by use of a strap 22. Sliding on the bar 20 is a T-piece 25 which can be held in one of a number of positions by pins inserted in two holes 27 and so fitting into holes 21 formed in the bar. The T-piece 25 carries a slidable height bracket 30 which can be held in position by clamps 32. Alternatively, this bracket can be mounted directly on the bar 20. A member 35 slides on the bracket and can be held at a number of fixed heights. A bar 54 is mounted on the member 35 and can be fixed in any desired angular position. It also carries an angularly adjustable block 56 in which fits a bar 62 having a dial gauge 64 mounted at its end. For setting purposes, the bar 62 may be replaced by a bar having a ball fixed at its lower end. The workpiece W is mounted centrally on the bobbins 12 and the apparatus can then be adjusted, by the use of slip gauges, to measure various dimensions of the workpiece, or for example, to check the concentricity of the tubular member 71. In the example described, the workpiece has a dowel hole 70, Fig. 3, in its flange 68. This is used to provide an angularly positioned datum line. The bar 20 is rotated until its centre line is in line with one of the holes 18. A dowel pin 83 (Fig. 3) is inserted in the dowel hole 70 on the workpiece and is aligned with the centre line of the bar 20 by fitting a bridge piece 80 on the bar and using suitable slip gauges 84. The workpiece is then clamped and the bar set to a position parallel to the axis of the tubular member 71. The angular movement required is obtained from the working drawing and a peg inserted in a suitable hole 18, spaced from the dowel hole by an angle slightly less than that required. The remainder is then built up using slip gauges.