Model making; including workshop practice, design and construction of models, a practical treatise for the amateur and professional mechanic .. (1919)
Yates, Raymond F. (Raymond Francis), 1895- ed · New York, The Norman W. Henley Pub. Co. · leaf 73
ough to drill the dot off,then raise the spindle, and, by means of the small circlescratched on the plate, see if the tiny indentation made 70 Model Engineering is exactly in the center, using the circle as a guide. If itis properly centered, drill just a little further (do notpermit the point of… … Fig. 46—Plate showing the holes started after the circles are made not bore right through the plate without raising the spin-dle several times to see that the drill is in the exact cen-ter. Fig. 46 will make this clear. Those amateur mechanics who have tried to drill atransverse hole in a piece of…
Machinery
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