Patent GB-564290-A (GB)
Title: Milling attachment for lathes
IPC: B23C7/04
Filed: 1943-03-19
Abstract: 564,290. Attachments for milling. GLOBE PRODUCTS MANUFACTURING CO. March 19, 1943, No. 4514. Convention date, July 20, 1942. [Class 83 (iii)] An attachment for enabling milling to be performed on a lathe comprises a bracket adapted for securing to the lathe bed at the headstock end and carrying a vertically adjustable support for a tool spindle which is driven by belts from the lathe spindle, an arbor carried by the tool spindle and supported at its other end in a vertically adjustable bearing mounted on a bracket secured to the tailstock end of the bed, and a work table to replace the lathe cross slide on the saddle, means being provided for gauging the position of the work table relatively to the spindle-supporting bracket. The bracket 16 engages a V-guide 17 and a flat guide 18 on the lathe bed 10 and is secured thereto by central bolts 24. Vertical guides 30 on the bracket engage corresponding surfaces on the spindle support 48, the edges of the guides being bevelled at 31, Fig. 3, and the support being provided with a gib 50 and shims 54 to give adjustment for wear. The support is clamped in adjusted position by screws operated by handles 56b and a plate 55, Fig. 2, secured to the support engages the nuts of the screws to prevent them from turning. A screw 37 is rotatably mounted in the bracket 16 by means of a ball thrust and journal bearing 35 carried by a block 33 secured to the'bracket and is provided with a hand wheel 42. Collars on the screw are clamped against the bearing by a nut 43 and a graduated flange 46 is frictionally held on the screw by a spring washer to-read against an index mark 47 on the block 33. A nut 58 engaging the screw 37 is attached to the spindle support 48 and is split at 38d, Fig. 3, to allow adjustment of fit on the screw by means of shims and clamping bolts 58f which are accessible through a gap 29, Fig. 2, in the bracket 16. The tool spindle 60 is journalled in bearings 48c, 48d in the support 48 and is driven by a pulley 61 and belt 62 driven through a double pulley 63 and belt 69a connected to a pulley 69 attached to the lathe spindle. The pulley 63 is carried by a lever 64 pivoted at 65 on the bracket 16, a screw 64<1> on the lever engaging the bracket to vary the position of pulley 63 relatively to pulley 61. A jockey pulley 67 is carried by an arm 66 pivoted to the upper end of the lever 64 and a spring 68 attached to the lever is engageable with one of a series of holes 66a on the arm to vary the belt tension. The cutter arbor 70 is secured to the spindle 60 by its tapered end 70a and is supported at the other end in a ball bearing carried by a block 71 vertically adjustable in guides on a bracket 72 axially adjustable on the lathe bed. A bar running in a T-slot in the bracket serves for clamping the block 71 by means of screws having handles 75a and sufficient clearance is allowed in the T-slot to enable the bearing to be self-aligning. The cutter 171 engages a keyway extending along the arbor and is secured in the required position by collars 70g of varying length clamped against a flange 70b on the arbor by a nut 70h. A work table 80 replaces the lathe cross slide on the saddle 78 which may be traversed by the usual lathe mechanism. A nut 81, Fig. 10, engages the transverse screw 79 on the saddle which may be rotated by a handle 79a or by the lathe power feed, the nut being attached to the table by dowels 82 and a screw 83 which is recessed into the table to clear the work. A V-groove 90 in the table allows cylindrical work to be secured in a position perpendicular to the cutter arbor by means of clamps whose bolts engage T-slots 89a in the table. A trough 86 extends round the edge of the table to collect coolant and a guard 84 is attached thereto to protect the transverse ways of the saddle. Gauging-devices.-A machined surface 95, Fig. 1, on the bracket 16 enables longitudinal displacements of the work table 80 to be measured accurately by placing an inside micrometer between, this surface and the vertical edge 96 of the table.