PRECISION PRODUCTION GRINDER

• Main Author: GLENN M. SNYDER
• Format: Patent
• Language: English
• Published: 03.06.1969
• Subjects: COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOTDIRECTED TO A PARTICULAR RESULT; DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g.ARRANGEMENTS FOR COPYING OR CONTROLLING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS; GRINDING; MACHINE TOOLS; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OFPARTICULAR DETAILS OR COMPONENTS; MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; METAL-WORKING NOT OTHERWISE PROVIDED FOR; PERFORMING OPERATIONS; POLISHING; TRANSPORTING

1,209,059. Grinding. LANDIS TOOL CO. 27 Dec., 1967 [27 Dec., 1966], No. 58703/67. Heading B3D. In a grinding machine for repetitive work in which the grinding-wheel 13 is fed to a positive stop, the feed mechanism is incrementally adjusted in response to a signal from a gauge 26 to correct for variations in work size before the next grinding operation. The feed-screw 28 is advanced rapidly by a piston 29 and then slowly by a rack-and-pinion 38 until a pin 83 on the slow feed shaft 36 engages a stop 84, the operating fluid being controlled by a solenoid 3, an infeed valve 54 and a slow feed valve (not shown). Switches 7LS, 8LS on the slow feed mechanism initiate the advance of the gauge 26 to the workpiece W and sparkout. If the workpiece is found to be oversize or approaching undersize, as indicated by the gauge dial, Fig. 5 (not shown), the appropriate signal is given to the controlling solenoids SOL-7, SOL-9 of a pawl-and-ratchet mechanism 45 to advance or retract the feed-screw 28 by one increment. When it is necessary to retract incrementally, this is done when the grinding wheel reaches its back position; incremental advancement is also effected at this back position when the circuitry is modified as in Fig. 2A (not shown).