Patent GB-1138341-A (GB)
Title: Profile grinding machines and fittings for use therewith
Inventor: BURROWS DENNIS STANLEY
IPC: B24B17/00
Filed: 1964-11-17
Abstract: 1,138,341. Grinding; trueing grinding wheels; tool-holders. ROLLS-ROYCE Ltd. 13 Jan., 1966 [17 Nov., 1964], No. 46821/64. Headings B3B and B3D. A profile grinding machine comprises a carriage 8 and table 2 biased towards one another and arranged for relative traversing and cross-feed movements at rightangles to the direction of biasing, the table carrying a workpiece 5 and the carriage supporting on parallel axes a grinding wheel 12 and a rotatable follower 14 for respectively engaging the workpiece and former which is mounted on the table or a fixed part, and a support 16 mounted to rock about an axis 17 parallel to the direction of traverse and arranged to detachably carry a dressing tool and a cutting tool whereby upon traverse of the table relative to the carriage the dressing tool and cutting tool can be brought respectively into engagement with the grinding wheel and rotatable follower. The table 2 is mounted on a cross-slide 6 and is traversable by a handle 3 and supports the former 4 and workpiece 5 which are engaged by the follower 14 and grinding wheel 12, either of which is rotatable by a belt 12A from an electric motor 13. The follower and grinding wheel, together with the motor, are mounted on the carriage 8 which is mounted 'for vertical movement in a guide structure 7 and is partially counterbalanced by a weight 9 on a chain 10 passing over a pulley 11. A base 15 for the support 16 is mounted on the table 2 between the former and workpiece and is formed with bearing brackets 15A for locating the support for rocking movement about an axis 17, the rocking movement being limited by selective use of pins 26, 27 to 180 degrees or to either of the 90 degree arcs comprising the 180 degrees. The support 16 is rockable by means of a handle 28 and is in the form of a yoke having a socket 18 for receiving either a holder 19, Fig. 4, for a dressing tool 21 or a holder 20, Fig. 5, for a cutting tool 22. Each holder is provided with a flange 19A, 20A for engaging datum pads 23 on the support 16 whereby the tools can be accurately located. The tools can be adjusted by screws 30 in the holders and a jig may be used for setting the tools, the holders being mounted in a recess in the jig and the respective tool adjusted by its screw until it abuts, or is a distance determined by slip gauges from a datum plate. In operation, the dressing and cutting tools are adjusted in the jig to a distance from the plate corresponding to the radius to be formed on the periphery of the follower and grinding wheel, the tool-holder 19 for the dressing tool is placed in the support 16 which is then brought below the axis of the grinding wheel by movement of the table and the crossslide adjusted to a datum position. The carriage is then lowered and at the same time the support is rocked by the handle 28 to produce any one of the shapes illustrated in Fig. 7 on the periphery of the wheel, the index reading of the handle 36 for vertically moving the carriage being set at zero on completion of the dressing operation. Thereafter, the dressing holder 19 is replaced by the cutter holder 20, the belt 12A is changed to drive the follower wheel which is adjusted by its own vertical feed 37 until its axis is at the same height as the axis of the grinding wheel, and the support 16 is moved to be below the follower wheel. The carriage 8 is then lowered to the same position as for dressing while the cutting tool is rocked by the handle so that both the grinding wheel and follower have identical profiles.