Patent GB-402931-A (GB)
Title: Improvements in or relating to internal grinding or boring machines
IPC: B24B5/06
Filed: 1932-11-03
Abstract: 402,931. Grinding internally. AKTIEBOLAGET SVENSKA KULLAGER-FABRIKEN, 17, Artillerigatan, and TORNEBOHM, H. V., 34, Johannebergsgatan, both in Gothenburg, Sweden. Nov. 3, 1932, No. 31056. [Class 60.] Round holes, enlarging and trueing ; gauges.-An internal-grinding machine for grinding the bores of ball races &c. and provided with gauging mechanism, comprises a bed 5 upon which is a table 11 carrying a head 4 supporting a grinding-wheel 1, the table being reciprocated and reversed by mechanism controlled by dogs on a wheel 8 which contact with a stop 9, and on the table is mounted an adjustable plate 12 formed with a cam surface 13. The work 18 is driven by a spindle 23 mounted in fixed bearings 24, 25, and on the spindle is secured a chuck body 19 having a conical seat 26 for jaws 27 movable by a ring 29 screwed in the end of the body, and the work-pieces 18 are held in position by a plate 32 connected by pins 34 to a ring 33 screwing on the body 19 and adapted to press the work-pieces against the front end of a sleeve 38 fixedly mounted in the body 19. The cam 13 engages a roll 45 on a T-lever 47 pivoted to the bed at 470 and acted on by a spring 48, the lever thus swinging as the table 11 moves, and moving a tube 54 pivoted to the lever at 56. Surrounding the tube 54 is a tube 59 slidable in bearings 60, 61 and connected, by a collar 62, and arm 63 to a guide rod 64 pressed by a spring 66 ; the arm 63 carries a bolt 68, with nuts 70 thereon, passing freely through a collar 69 secured to the tube 54, and movement of the collar 62 is limited by a stop 71. The gaugemember consists of a part-spherical body 72, Fig. 7, having a projection 73 such that the diameter 75 across the projection and body 72 is that of the finished work, and the body is pivoted to a collar 76 secured to the forward end of the tube 54. The end of the tube 59 has thereon a sleeve 79 carrying a rotatable collar 80 slidable in the sleeve 38 and rotated, by a screw 82 movable in a groove 83 in the sleeve, with the chuck ; the collar carries a link 84 pivotally attached to the gauge body 72, which thus rotates with the work. As the table 11 and the grinding-wheel 1 move towards the right the lever 47 moves the tubes 54, 59, &c. and thus moves the gauge, tilted about its pivotal connection with the link 84 in the reverse direction to that shown in Fig. 6, in the bore of the work. Movement of the tube 59 is arrested by the stop 71, and further movement of the tube 54 tilts the gauge as shown in Fig. 6, the tilting being only so far as allowed by contact of the projection 73 with the work ; when the work is to size, the gauge can tilt further and the corresponding movement of the tube 54 closes an electric contact 86, thus energizing a solenoid 10 to lift the stop 9 and permit the grinding-wheel 1 to move right out of the work. Cooling fluid is supplied along the tube 54. The gauge contacts with the centre of the length of the bore ; it may be arranged to change the rate of feed, or of the carriage 11, and then to cause the grinding- wheel to be removed from the work.