Patent GB-452060-A (GB)
Title: Improvements in or relating to grinding or tool-sharpening machines
IPC: B24B3/00
Filed: 1935-06-04
Abstract: 452,060. Grinding-machines. STEVENS, A. H., 5, Quality Court, Chancery Lane, London.-(Sundstrand Machine Too] Co. ; 2531, 11th Street, Rockford., Illinois, U.S.A.) June 4, 1935, No. 16225. [Class 60] In a grinding and tool-sharpening machine having a work-support 26 mounted on a bar 58 so as to be capable of longitudinal feeding movement along the bar and oscillatory movement about it, means are provided to prevent longitudinal movement due to the oscillation, and for limiting the extent of the oscillation in both directions. The machine shown is provided with rough and finish grinding wheels 21, 22 on the ends of a spindle 23 mounted in ball thrust bearings and extending parallel to the bar 58, on which are mounted the similar work supports 26, 27. A honing wheel 24 is carried on a spindle perpendicular to the spindle 23. The work support 27 is traversed on the bar 58 by rotation of a nut 71 rotatably mounted on it and engaging a screw 70 carried on the end of the bar 58. The screw extends into a recess in the end of the bar, and carries a collar 73 forming the middle race of a double thrust ball bearing, the outer race 77 of which is pressed inwardly by an adjustable spring 78 which forms a cushioning means to limit the pressure with which the work is applied to the grinding wheel. The support 27 is provided with handles 66 by which it may be oscillated on the bar 58 to carry the work across the face of the grinding wheel, and in order to prevent simultaneous longitudinal movement due to the nut 71 turning on the screw 70, the oscillatory movements are imparted to the screw also. For this purpose, a pair of members 86, Fig. 8, carried by the support engage opposite flats formed on the screw 70, and cause it to turn together with the support and the nut 71. The means for limiting the extent of the oscillatory movements of the support comprise a flat 60 on the underside of the bar 58 engaged by a spring-pressed plug 61 slidably mounted in a recess on the underside of the support. A bushing 63 screwed into the recess may be adjusted to limit the axial movement of the plug 61, and hence the extent of oscillatory movement of the support permitted by it. The device may also be used to clamp the work support on the bar. The work-holder 57 is angularly adjustable about an axis perpendicular to the bar 58 on arcuate bevelled supporting ways 91, Fig. 7, by a manually rotatable worm 94 engaging teeth on its periphery. It is provided with T-slots 99 for attaching either an angularly-adjustable guide member against which the work is held, or a tool post by which the tool is clamped, both having scales to indicate the grinding angle. A support 28 is adjustably mounted on a clamping member 106 on a bar 105 in front of the honing wheel 24, a single clamping rod and nut securing the support in its adjusted angular position on the clamp 106, and the latter on the bar 105. The wheel spindles are belt-driven from a motor 29 in the base of the machine, the twisted run of the belt 46 which drives the wheel 24 engaging the pulley 152 of a pump which draws coolant fluid from one compartment 142 of a tank and supplies it through conduits 32, 33 to the wheels. The fluid drains into receptacles formed by side walls on the work supports 26, 27, from which it returns by pipes 145 to the other compartment of the tank, in which sediment settles. The two compartments are separated by a vertical partition, over the top of which the fluid flows from the settling to the supply compartment. The tank is supported so that it may be removed by lifting it.