10 MODEL ENGINE CONSTRUCTION.
against the crank of the driver-chuck, and revolves, taking the work round with it. It is best to have two or three different sizes of lathe-carriers, and any blacksmith will make them (see Fig. 5). A bell-chuck (see Fig. 6) is necessary for centering work to be drilled, as when boring out a cylinder. It is screwed on to the lathe, and the work, having been previously centre-punched, is put in the lathe, and retained in position by means of half-a-dozen
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Figs.4, 5.
set-screws, which are tightened up equally all round the work, so as to keep its centres in line with those of the lathe. The advantage of this tool is that,having a bell shape, the drill can be sent completely through the work and out at the other end, which cannot be done so well with a face-plate. The accurate centering of work in a bell-chuck is very difficult, and takes some practice to do it properly.
Price 14s. to 30s.
