Page:Practical Treatise on Milling and Milling Machines.djvu/235

229 TABLE OF LEADS

This table contains all the leads that can be obtained with any possible combination of the change gears furnished with Universal Milling Machines made by Brown & Sharpe Mfg. Co., even though some of the leads are not available for use on account of the gears interfering or not reaching. Combinations of gears that are too small in diameter to reach for right-hand spirals can generally be used for left-hand spirals, as the reverse gear is then required and will enable the gears to reach. For further information regarding the use of these tables, see Chapter IV.

The change gears that are furnished with the machines have the following numbers of teeth: 24 (2 gears), 28, 32, 40, 44, 48, 56, 64 72, 86 and 100.