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Knight's Mechanical Encyclopedia (ed. Knight), B. (search)
. The motion of the cutter-block is caused by a side-screw, upon the end of which is a large wheel that engages in a small pinion fixed to the stationary center or pedestal of the machine. With every revolution of the cutterbar, the great wheel is carried around the fixed pinion, and, supposing these to be as 10 to 1, the great wheel is moved 1/10 of a turn, and imparts an equivalent motion to the feed-screw that moves the cutterblock. Cylinder borer. This machine was invented by George Wright when in the employment of Boulton and Watt, Birmingham, England. A machine substantially the same, but with a different feed arrangement, is shown in the accompanying illustration. Cylinder boring-machine. The boring-machine (Figs. 811 and 812) has a cutter-head revolving with and sliding on a mandrel a, which is in the axis of the cylinder. The cylinder L is secured to the bed A of the machine in exact conformity to the axial position of the mandrel a. The mandrel is a hollo