Patent GB-1246796-A (GB)
Title: Apparatus for setting cutting tools in machine tools
Inventor: HARKNESS LESLIE
IPC: B23Q17/22
Filed: 1967-09-15
Abstract: 1,246,796. Presetting tools; gauging. WARNER SWASEY ASQUITH Ltd. 3 Sept., 1968 [15 Sept., 1967], No. 42065/67. Headings B3B, B3C and B3T. A jig for use in presetting cutting tools intended for use in a machine tool such as a turret lathe comprises a support for the cutting tool and its holder and which is adjustably locatable thereon in relation to reference surfaces on the jig, the reference surfaces corresponding to predetermined mutually perpendicular datum planes on the machine tool in which the preset tools are to be used. In the embodiment shown in Figs. 3 and 4 the jig is for use in the presetting of tools for the cross-slides of an automatic lathe and comprises a support 40 having a top reference surface 48 which has a dovetail guide 42 simulating the tool mounting on the machine slide. A vertical wall 50 extends from the support and has a reference face 52, removable side plates 70, 72 being provided and which have reference faces 84, 86; 85, 87, respectively. The cutting tool and holder are positioned on the dovetail on the support, the height of the tool cutting edge above the surface 48 is adjusted by conventional means located beneath the tool in the holder and the height measured by a height gauge, Fig. 5 (not shown), the longitudinal and transverse position of the cutting edge being measured by dial gauges 58 and 94, respectively. With the tool accurately positioned a location peg 90 is adjusted to abut a reference surface 87 or 85 whichever is appropriate, the location peg forming a stop which co-operates with an abutment on the tool slide when the tool and holder are in position in the machine. A cutting tool set up in the jig described will be located in the exact position for use in the machine tool. In a further embodiment a jig is used for setting up cutting tools for use in an indexable turret in a lathe, the tools effecting feed movements longitudinally with respect to the lathe spindle, the jig comprises a support 140 which has a number of accurately positioned holes 142, 144, 146, 148 corresponding to the positions of the tool carriers on the lathe turret. A bracket 194 is bolted to the block 140 and from which extends a vertical column and spindle 196, 198, respectively, the spindle having at its end an arm 200 which carries a gauge 208 movable in a slot 210, the arm being pivotable around the column and clampable in selected angular positions by a clamping member 206. The gauge 208 determines the position of the cutting tools, in turn, from the reference surface 149 on the support 140 which simulates a vertical surface on the actual tool carrier and hence represents an axial setting of the tool on the lathe. A further gauge 212 is provided for determining the position of a tool cutting edge transversely to the axis of the machine spindle and hence the diameter of the workpiece to be turned the gauge being releasably located in the hole 142 which coaxially corresponds to the axis of the machine spindle. The gauge 212 is used in conjunction with an alignment gauge 224 which ensures that the cutting tool is correctly aligned angularly in its respective hole, i.e. 146 in which it is secured by way of a collar 162 and screw 166. A further gauge 240 may also be provided to effect alignment of cutting tools which are adapted to move transversely of the turret to effect counterboring or grooving operations. In order to accept cutting tools preset in the jigs described, a location stop is provided on each cross-slide and a location transfer arm, Fig. 10 (not shown), is provided for use on the turret whereby the front and rear slide location stops and the turret tool carrier are all in the same transverse plane.