Handy man's workshop and laboratory . HOP AND LABORATORY 167 The angle plate A is secured to the bed of the lathe. In thevertical face of angle plate A is a dovetail groove, in which angleplate B fits, so as to afford an up-and-down motion. On the topface of angle plate B is a dovetail groove, in which slide plate Coperates. Lever D pivots on swivel E, giving movement to slideplate C. Place the screw to be slotted into draw chuck F, andtighten on draw wheel G. With the fixture so placed on the lathebed as to cut the screw centrally, the depth of the slot may beregulated by adjusting screw /. B
Handy man's workshop and laboratory . HOP AND LABORATORY 167 The angle plate A is secured to the bed of the lathe. In thevertical face of angle plate A is a dovetail groove, in which angleplate B fits, so as to afford an up-and-down motion. On the topface of angle plate B is a dovetail groove, in which slide plate Coperates. Lever D pivots on swivel E, giving movement to slideplate C. Place the screw to be slotted into draw chuck F, andtighten on draw wheel G. With the fixture so placed on the lathebed as to cut the screw centrally, the depth of the slot may beregulated by adjusting screw /. By moving the lever D, thescrew is fed into the saw H. There is an elongated slot / in theangle plate B to allow the draw clutch to pass through and moveback and forth. In angle plate A is a stud K to hold in positionthe adjusting screw /. By a little practice the screws may be slotted very rapidly. MICROMETER ATTACHMENT FOR THE MILLING MACHINE A practical and simple tool for accurate milling-machine workis shown in Figs. 149 and Fig. 149—The micrometer attach-ment used for centering workunder an end mill Fig. i5o—Centering the workunder a face mill l68 HANDY MANS WORKSHOP AND LABORATORY A common method of setting the work central with the cutteris to place a square on the plate of the machine, with the bladein contact with the work, and caliper between the upper end ofthe blade and the cutter, first on one side and then on the cutter of course is central when the caliper reads the same onboth sides. The graduations on the machine are also used. After working along these lines for some time, the writer madethis micrometer attachment. The stock of the gage is shown asplaced against the cutter, and the micrometer barrel is adjustedto make contact on the work. The work is adjusted until the micrometer reads alike on bothsides. This tool is also handy on lathes, planers, shapers, and for adepth gage.—17 CRANKPIN TURNING DEVICE Some time ago we had a crankpin to
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