Patent GB-998307-A (GB)
Title: Borematching system in or for a machine tool
IPC: B24B49/04
Filed: 1961-11-01
Abstract: 998,307. Linear dimension gauges; measuring displacement electrically. A. A. JONES & SHIPMAN Ltd., and J.HOULDSWORTH. Oct, 26, 1962 [Nov. 1, 1961], No. 39038/61. Headings G1M and G1N. [Also in Division B3]  A boxmatching system, in or for a machine tool such as a cylindrical grinder, includes mechanical workpiece and bore gauging appliances having parts at least thereof disposed in a common unit and movable relatively to one another in response to a change of workpiece size during a machining operation and being arrange so that, when these parts are in a predetermined relative position, the workpiece and bore being measured will interfit with the required predetermined clearance, and means adopted to detect when these parts are in the predetermined relative position. The parts are preferably connected to a transducer which converts the mechanical movements into signals which are fed to indicator or control means; the transducer may be mechanical/ pneumatic or mechanical/electrical. A tailstock supports one end of a workpiece 15, Fig. 1, which is to be ground to fit with desired clearance the bore of a previously manufactured component 12. A lever work contact 16 is adjustably secured to a lever 2 pivoted at 7 to the tailstock body 10. An upper work contact 17 is adjustably secured to a lever 1 pivoted at 6 to lever 2 and having secured thereto and movable therewith a lever 3 supporting at its extremity one electrode 8 of a condensor. The component 12 is contacted on part of its bore by projections 13 of a bracket 14 adjustably mounted on the tailstock body 10. The diametrically opposed part of the bore is contacted by work contact 11 carried on a lever 4 pivoted at 5 to the tailstock body. Extensions 23, 24 form part of, and move with, lever 4 and carry the other electrode 9 of the condensor .When the workpiece 15 has been ground to the desired diameter the gap between the electrodes 8, 9 is such that a signal is emitted to immediately cause or initiate cessation of reduction of the workpiece diameter. The feelers 16, 17 are clamped in carriers 55, 56 clamped to arms 57, 58. Arm 57 is mounted in sleeve 63 secured to side plates 1, 43 coupled together by beam 44 to form a structure. An electrode 8 is clamped to extension 3 of side plate 1. The structure is pivotally mounted on bridge piece 45 by cross strap hinges. Bridge member 45 spaces side plates 2, 19 secured at one end to arm 62 carrying the arm 58 and at the other to beam 20 forming a structure pivotally mounted on tailstock body 10 by cross-strap hinges. Feelers 16, 17 are urged against the workpiece 15 by springs. A tube 30 is welded to beam 31 pivotally mounted on tailstock body 10 by cross strap hinges. Plate 36 welded to tube 30 carries clamp 37 forming a spherical seating for screwed extension 38 of electrode 9. Slidable within tube 30, and lockable in any axial position therein, is extension 40 provided with work contact 11. Work support mandrel 72, relieved to provide projections 13, 13 engaging the bore in component 12, is secured to slide 46 mounted on slidewav 48 fastened to tailstock body 10. Slide 46 is positioned on the slideway by slip gauges and secured in the adjusted position by screws 52. When used for size gauging without borematching, slide 46 and work support 72 are replaced by slide bracket 53 locked against the abutment face or slideway 48. The position of work contact 11 is adjusted by slip gauges 54.