Practical Shop Mechanics And Mathematics

Cover Practical Shop Mechanics And Mathematics
Practical Shop Mechanics And Mathematics
James F James Francis Johnson
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46 SHOP MECHANICS AND MATHEMATICS 8. In the cross-feed mechanism, Fig. 37, what is the rate of Worm keyed to feed rod FIG. 37. Cross-feed Mechanism.
travel of the cross-feed? How far will the table travel during 12 turns of the feed rod?
46. Simple Gearing as Applied to a Lathe. Fig. 38 shows the arrangement of gears in a lathe. The idlers used do not effect the velocities of the gears, but only serve to reverse the motion of the following gear.
In the illustration the drive is as follows: With
... the back gears in, gear No. 1 is fast to the cone pulley and turns with it loose on the spindle, driving through the back gears No. 2 and No. 3 to gear No. 4, which is keyed to the spindle but unlocked from cone pulley. The spindle gear turns with the spindle and drives the inside stud gear through an idler, turning the change stud gear, which drives through idler to the lead screw.
When the back gears are out, gear No. 4 is fastened by a pin to the cone pulley and turns with it, and the rest of the driving is the same as before.


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