Patent GB-458858-A (GB)
Title: Improvements in or relating to indicators or calculators for controlling the operation of machine tools using fixed or movable cutters
IPC: B23Q17/00
Filed: 1935-03-26
Abstract: 458,858. Facilitating the control of machine tools. MURRAY COLOUR CONTROLS, Ltd., 37, Walbrook, London, and MURRAY, G. L., 15, North Hill Court, Headingley, Leeds. March 26, 1935, No. 9383. [Class 83 (iii)] [See also Groups XVIII and XIX] A mechanical calculator for facilitating the control of a machine tool, when set to known working requirements (size of work or cutter), which may be displayed through a window by manipulating the calculator, automatically adjusts indicating means whereby other working requirements (speeds or feeds) are displayed through a further window. In one form of calculator, Figs. 1 and 3, a knurled ring 10 is adjusted to show diameter readings 9 through a window 11 in the casing 4, this being accompanied by a corresponding cutting speed indication displayed through the elongated window 8 of the casing. The diameter indications are upon the outer periphery of a shutter member 7, Fig. 3, while the cutting speed indications comprise four rings of reading with nine in a ring on small drums 1 adapted to rotate about the spindles 15. Sixteen small drums are provided and these are all geared together by the toothed wheels 14. One of the small drums carries a sprocket wheel 13 which is intermittently engaged by pegs 12 arranged on the inside of the shutter member. Thus, as the shutter is rotated to display different diameter indications, the staggered windows 6, Fig. 1, in the shutter reveal corresponding cutting speed indications along the length of a small drum without movement of the latter. One of the pegs 12 then strikes the sprocket on the drum and rotates it to the next row of indications, this taking place nine times since nine pegs 12 are provided. The small drums may be rotated bodily about the central axis 3 by releasing a peg 20 and this can be set to bring a different drum into position beneath the windows, a range of spindle speeds being visible in an end window corresponding to these positions. A modified calculator operated by a form of sun and planet gearing is described. In a further modification in which no gearing is used, Fig. 7, diameter indications 9 are provided on a knurled ring 40 which is connected to a shutter 38 and cutting speed indications are provided on a ring 41 at the other end of the casing 37, this ring is connected to a drum 39 carrying spindle speed indications which show through a window 6 in the shutter 38 and an elongated window 8 in the casing. A still further modification of this type is provided with a further ring and shows two ranges of diameters &c. The calculators above described may be combined with a control indicator, Fig. 10, so that setting the calculator to obtain the desired information also sets the control indicator 54 which by the indications 56 show the positions to which the control handles of a machine must be set to obtain the cutting speeds or spindle speeds shown on the calculator. Instead of numerical indications, lines of different colours or formation, to represent various types of work or material, may be used. Specification 433,302 is referred to.