Patent GB-715302-A (GB)
Title: Improvements in gauging appliances for hobs and the like
IPC: G01B5/00
Filed: 1952-07-17
Abstract: 715,302. Gauging gear teeth. KRUSE, H., and FETTE, C., [trading as FETTE, W., [Firm of.]]. July 17, 1952 [April 28, 1952; April 28, 1952; April 28, 1952], No. 18084/52. Class 106 (2) Apparatus for gauging pitch of gear teeth, angles and profiles of hobs and worms, comprises a fixed holder for a cutter or workpiece mounted on a frame which also carries a movable gauging unit having a test element which is presented to the surface of the test piece, the test element being movable axially of the test piece for testing pitch spacings and tiltable in both vertical and horizontal planes for testing pitch and pressure angles, and also movable vertically for testing the profile. The apparatus comprises a base 1 with a guideway 2 for the cutter or test piece holder which comprises the centres 3b, 3c. The testing assembly is mounted on the base plate comprising a rotatable base plate 4 and a cross slide 5 and a slide 6. The testing assembly can be adjusted transversely to the axis a a by the cross slide 5 in order to test profile elements transverse to the axis a a while the slide 6 serves for assessing profile values in the axial direction a a. The vertical adjustment of the upper elements 9 to 13 of the testing appliance is provided by means of a spindle 8 for profile measurement of worms and hobs with an involute tooth form and also for tooth face measurements. Fig. 3 indicates the various measurements which may be made. The arrow 1a<SP>1</SP> shows the pivotal movement by the member 1a, arrow 5<SP>1</SP> shows the movement of the slide 5 and the arrow 6<SP>1</SP> that permitted by the slide 6. Arrow 7<SP>1</SP> shows the pivotal movement of the slide 7 and arrow 8<SP>1</SP> the vertical adjustment of the spindle 8. Arrow 9a<SP>1</SP> shows the rotation of the upper part of the testing appliance permitted by the bearing 9a while the arrows 11<SP>1</SP> and 12<SP>1</SP> show the possible adjustments of the slides 11 and 12 in the two directions x<SP>1</SP> and y<SP>1</SP> and finally 13<SP>1</SP> shows the adjustability of the testing head 13. Fig. 4 shows the gauge determining pitch angle and comprises a mandrel 20 secured to the cutter holder which is provided with two setting lugs 20a, 20b. A rule 21 is pivoted to the mandrel 20 and is provided with a roller 21a. The pivoted position of the rule 20 for adjustment of the test lever 13a is determined' by means of slip gauges 22 clamped between the lugs 20a, 20b. A similar gauge is shown in Fig. 5 in which a support 23 can be secured between centre holders 3b, 3c. Figs. 6 and 7 show the gauge in use for adjusting pressure angles and pitch angle. The mandrel 29 is clamped between the centre 3b, 3c and embodies a bearing 27 in which a sleeve 28 is rotatably mounted to allow of movement in both directions as indicated by the arrow 28'. An indicator 29 is connected with the sleeve 28 which indicates the rotary position against a scale 30. A gauge pin 3t is slidable in the sleeve 28 but is not relatively rotatable, by means of this arrangement the test lever 13a of the testing appliance can be accurately set so that with the arrangement shown in Figs. 1 and 2 measurement can be made on hobs, worms, or spiral hobs.