Patent GB-148080-A (GB)
Title: Improvements in and relating to cam milling machines
IPC: B23Q35/10
Filed: 1919-10-13
Abstract: 148,080. Alexander, A. E., (Miller Transmission Co.). Oct. 13, 1919. Milling-machines.-A cam milling - machine more particularly for milling cams of the kind used in the differential gearing device described in Specification 9804/15, [Class 80 (ii), Gearing, Variable speed &c.], and provided with a rotary work-spindle 69 and milling.-cutter spindle 4, has the master cam 80, formed on the back of the chuck or workholder 26, so arranged that the pressure between the guide-roller and this cam tending to accelerate or retard the rotation of the work spindle, is balanced by the corresponding pressures between the tool and the work, caused by the varying obliquity between these parts. The work-spindle 69 is driven from the cutter-spindle 4 through a worm 36 on an extension 30 of the spindle 4, engaging a worm-wheel 38 on a spindle 39, and driving through a jointed extensible shaft 46 and change-speed gearing 60, 61, an interchangeable pinion 64 engaging a gear 65 on the work-holding chuck 26. The work spindle 69 is slidable longitudinally in its support 28, a spring 81 keeping it retracted so that the cam face 80 is always against the conical roller 86, Fig. 9. The cutter spindle 4 is mounted in conical bearings 8, 9, and is adjustable longitudinally by a nut 11, the driving pulley 5 being slidable on the spindle 4 and coupled to it by a pin 6 engaging a slot 10. Work-table feeds.-The work-spindle carrier 28 is mounted on transverse and longitudinal slides, movable by hand-operated pinions 105, 129, and racks 104 and 128 respectively. A spring 110 keeps the slide 100 pressed against a stop 117. Work slides.-The slide 100 may be locked in position by a locking gib 112, Fig. 2, operated by a handle 114. Screws 115 with enlarged bearing surfaces are provided for tight sliding adjustment. Gauging-devices.-The stop bar 118 for the longitudinal slide engages the holes in the slide 100 and frame at 120, and carries the adjustable stop nut 117 and hand-wheel 121, which may be graduated. The transverse slide may be locked in the selected position for machining cams of various sizes by a taper pin 138 operated by a handle 141, and engaging holes in the support 28 and in an interchangeable gauge plate 133. Lubricating and cooling cutting-tools and work. -Water is pumped on to the tool and work by a pump operated through a belt 154. The water is collected in a tray 146 forming part of the framing, and strained into a trough 148 having partitions 149, 150, to allow the shavings to settle. The water is returned to the pump through a strainer 157. Milling-cutters.-The milling-cutter 15 has a tapered shank 16, fitted in a holder sleeve 17. The shank 16 has a key extension 20 engaging a key slot 21 in the spindle 4. Chucks.-The chuck 26 has a sleeve 68 fitting in the sliding spindle 69 and provided with a retaining-nut 82. A draw-bar 70 clamps the work 25 on to the face of the chuck 26, which is provided with a gear 65 corresponding in size to the cam to be milled, and also with the master cam 80, engaging the conical roller 86 mounted on the stationary support 28.