Patent GB-278713-A (GB)
Title: Improvements in gauging devices for grinding machines and other machine tools
IPC: B24B49/04
Filed: 1927-10-05
Abstract: 278,713. Grothkopp, W., (Assignee of Bachmann, A.). Oct. 5, 1926, [Convention date]. Gauging-devices. - In a gauging-device applicable to cylindrical grinding-machines, centreless grinding machines, lathes, or screw-cutting machines, a holder provided with gauging-pins coacting with a measuring dial, is fitted with an extension handle guided in a supporting-bracket which is secured to the machine framing and prevents the gauge holder from being carried round with the work. A hollow bar 1 is provided with fixed upper and lower members 2, 3 respectively, the upper portion carrying a measuring-dial 4 and the lower portion a rocking lever 5 pivoted at 5<1> and constituting the lower gauging arm. A rod 6 pressed against the rocking lever by a spring is mounted in the bore of the bar 1 and transmits the movements of the lever 5 to the dial. The bar 1 also carries an adjustable upper gauging arm 8 and a handle member 9 carrying a horizontally 'adjustable intermediate gauging-arm 10. The three gauging-arms are provided with round-headed gauging-pins 13, 14, and 15 respectively. The handle member is guided in a forked bracket 17 which is pivoted at 18 to a rod 19 vertically adjustable in a bracket 21 secured to the machine framing. By raising the rod 19 and pivoting the gauge about the point 18, the device assumes the position shown in dotted lines in Fig. 5, the gauge sliding forward over a cross-pin 31 and engaging by gravity with the work. When conical workpieces are being treated the gauge is arranged to move with the work table of the machine and in this case the supporting bracket of the tube 19 is secured to the table. A screen 49 suspended from pins 50 serves as a protection against grinding-fluid. The gauge is roughly adjusted by means of a screw 24 engaging the arms 8, 9. The thread engaging the arm 8 is of twice the pitch of that engaging the arm 9 so that the pin 14 is in all positions of adjustment against the middle of the work. The pin 14 is also moved horizontally during adjustment by the engagement of the inclined rear surface of the arm 10 with a corresponding surface on a bar 28 secured to the member 3. Fine adjustment is effected by the aid of the .dial 4, a finished work-piece or gauge block being employed for setting purposes. On completion of a work-piece the gauge may be withdrawn to a position wherein a depression 32 in the handle engages over the pin 31. In .order to bring the work accurately against the gauge without damage a slide bar 33 secured to the bracket is engaged by a screw 34 and directs the gauge towards the work. The forward movement of the gauge is limited by a screw 35 while a screw 36 similarly limits the upward swing of the pin 15. By this arrangement grooved work-pieces may be gauged since the pins are prevented by the screws 34 - - 36 from penetrating beyond a short distance into the groove. In a modification, Fig. 6, the gauge comprises a handle portion 38 bearing .on a vertical post 39, and an adjustable slidebar 43 is connected to the post 39 by a pivot 67. The upper and intermediate gauging-arms each carry two sets of pins so that lateral guiding of the handle 38 may be dispensed with. Abutments 46, 47 prevent the pins from penetrating the groove when grooved workpieces are being gauged. In the adaptation to a lathe the bracket 51. Fig. 15, secured to the carriage, supports the rod 52 on which the device is mounted.