Patent GB-551009-A (GB)
Abstract: 551,009. Gear-cutting. BRITISH UNITED SHOE MACHINERY CO., Ltd., and RICKS, F. May 2, 1941, No. 5695. [Class 83 (iii)] Gauging-devices. - In an apparatus for gauging an article such as a gear G, Fig. 5, without removing the article from the cutting machine, a gauging gear 81 is moved into engagement with the gear G and the size indication obtained by measuring the distance between the gauging gear and an indicator 77 when the latter is in a definite preset position.. In the application to a geargenerating machine of the type described in Specification 435,702 the gear blank is mounted on a table and generated by a reciprocating pinion cutter. The table has relief movement away from the cutter on the return strokes and the blank may be cut in three stages with successive in-feeds of the cutter to the blank. A bracket 13 on the machine frame has secured thereto a spindle 15 flanged at 23 to support a plate 25 having an arcuate guide surface 33 for guiding a member 27 which is secured in adjusted position by a bolt 29. The upper part of the spindle has an eccentric portion 39 fitted with a bush supporting a measuring arm 43, and a portion 45 of the same eccentricity supporting, on ball bearings, the hub 55 of a gauging arm 57, both arms being adapted to swing about the eccentric axis of parts 39, 45. The member 27 has a stop face coacting with a stop face on the arm 43 which carries a dial-indicator 77 having a spring plunger 85 engaging the gauging arm. Limited movement between the gauging and measuring arms is permitted by the pin connection 83. The gauging arm carries setting disc 79 and gauge wheel 81, the former being used to set the arm 43 and the latter to gauge a completed work piece For setting, a disc 101 may be mounted on the work spindle. In an example the disc 79 is of one inch diameter and the wheel 81 of 1¢ inch pitch diameter. The disc 101 will then be of half an inch larger diameter than the gears to be gauged. The disc 79 is swung into engagement with the disc 101 and the dial set so that, with the stop faces 73 in engagement and the plunger engaging the gauging arm, the dial reads zero. The arms 43, 57 are then swung to an inoperative position, the gear blank mounted in the machine and cut. To gauge the gear the arms 43, 57 are swung so that the gauge gear 81 engages the gear under test, whereupon the gauge will read whether the gear is to size or how much further cut is necessary. In the case of gears having a stem protruding from the blank, Fig. 6, the blank 111 itself, to avoid clamping errors, is used as the setting disc, the blank being adjustably mounted on the table and set to run concentrically before cutting. The setting disc is first mounted on the gauging arm and the dial set. After cutting the gear the setting disc is replaced by the gauge gear 181. In this case the diameter of the setting disc is equal to the pitch diameter of the gauge wheel less twice the addendum of the gauge-wheel teeth. In the machine described the gear blank is moved slightly away from the cutter to provide relief on the return strokes and preferably the setting and gauging are both effected when the work is at one end of its movement in a position wherein an arc concentric with the axis of the arm 57, 43 passes approximately through the axes of the setting disc and the work.