Boring and Milling Table - Home Model Engine Machinist

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the top and boring the hole for the sleeve. If the table is made smaller than this, it can probably be turned and bored on the faceplate of the lathe itself, but the larger size will be more useful. After the machining had been done, the holes for clamping work to the table were drilled as in Fig. 2, and tapped ¼"-20. They may be laid out to suit individual requirements, or the table can be left blank and holes drilled as necessary to suit the job in hand. Turning the clamping screw from solid steel (Fig. 3) was a simple lathe job. The screw was threaded 5/16"-18, and the hole for it drilled in the table casting before the clamping slot was cut with a hack saw. One half of the hole was tapped to fit, the other half drilled out to clear the threads. This completed the work on the table, which is shown with the clamping screw in place in Fig. 4. Cold-rolled steel was turned and bored to the dimensions shown for the base of the supporting column (Fig. 5). The bottom of this piece was made to fit the lathe, so that it can be clamped to the cross slide in place of the compound rest. Reversed in the lathe and supported by the steady rest, as in Fig. 6, the column was left-hand threaded for the adjusting screw, a specially ground cutter bit being used. The keyway was made with a Woodruff keyway cutter while the work was held in a milling attachment. A brass tube of a size to be a nice sliding fit on the column was squared on both ends while held in the three-jaw chuck and supported by the steady rest, then drilled for screws to hold the key fast. The end cap was turned from steel to a snap fit in the sleeve, then reversed in the chuck as in Fig. 7 for threading the hole for the adjusting-screw guide. Drilling and tapping the holes for the two retaining screws, which was done with the end cap snapped into place in the sleeve, completed the supporting column. The adjusting screw was made from ½" steel rod, centerdrilled at each end and turned between centers (Fig. 8). The lefthand Acme threads, 10 to the inch, were cut to fit those in the steel column. The work NOVEMBER, 189
Threading the end cap, turning the adjusting screw, the complete set of parts for the screw, and the screw as it appears when assembled. Below, drawings of the table, the clamping screw, and the assembled column 190 7¼ .625 1½ 3" 18 TPI. TAP 5/16 - 18 TAP ¼ - 2O 2½ 2½ SAW SLOT 2½ CLAMPING SCREW .187 2½ 1½ DRILL .312 .125 .625 ½ 5½ 2" MACHINE TOP ONLY 1" .625 .375 SLEEVE KEY KEYWAY .250 1" STEEL PILLAR . 094 MAKE TO FIT LATHE 18 TPI .625 2¼ ID ½ - 10 LEFT-HAND ACME THREAD 1" 1.375 END CAP 5 ½ 4" .563 POPULAR SCIENCE
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Boring and Milling Table - Home Model Engine Machinist

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