The Autocar Volume 28; a journal published in the interests of the mechanically propelled road carriage

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1912 Excerpt: ...parts upon which work is going forward. The headstock, seen at A, contains a hollow steel mandrel or spindle running in adjustable gun metal bearings. The mandrel is furnished with a three-speed belt cone and also a back gear which works exactly like an ordinary change speed gear box except that it is not thrown into operation whilst the machine is running. When it is in use the belt cone runs loose upon the mandrel and drives the latter through a double-reduction spur gearing, giving a very low mandrel speed with a high flywheel speed. By this means heavy cuts can be taken in work of large diameter. A seventh speed (the back gear and the cones give, of course, six different ratios of speed altogether) is provided by utilising a specially small belt rim on the flywheel, for which purpose the belt is shortened, and to allow for the passage of it slots are cut as shown in the tray under the body. The saddle B carries the slide rest C. Longitudinal movement of the saddle is effected by the hand wheel D and transverse or cross movement by the hand wheel E, both hand wheels operating screw shafts. The slide rest C, which supports the lathe tool in a special holder, can be easily detached from the saddle, and is swivelable in a horizontal plane upon it. Operation of the hand wheels E and F therefore brings it into any desired position relative to the work in the lathe, while the hand wheel 1) will move the saddle as a whole in either direction in a horizontal plane. G is the poppet head or tail stock which can be slid along the body and clamped in any position, from which fine adjustments can be made by means of a hand wheel operating a square thread screw.( On the left hand side of the head stock is a train of spur pinions, the purpose of which is to provide an ...