Description

Immediate dispatch from Somerset. Nice older book in good condition. Some tanning and marking due to age. Year 1918. Hardcover. English. See images for condition.

About the book >.>.> The device consists of a base D a work holder E a slide F for drawing the broach through the work and a long lever G for operating the slide through the medium of a pawl and ratchet and a rack and pinion under the slide. The broach used is shown in Fig. 97 and is of T-section to correspond to the T-slot wanted. There are two notches in the shank end of the broach which are adapted to be engaged by pins in the coupling member H. The latter is attached to the top of the slide F and its outer end is pivoted to the body so that it may be swung up to clear the end of the broach or dropped into the horizontal position represented with its projecting pins engaged with the notches in the bottom of the broach. The turntable to be operated on is dropped into a seat in the fixture E. the broach is slid into the T-slot from the rear and the coupling member H is swung down to engage the end of the broach and at the same time align the work with the slide F. The two setscrews in the fixture E are then tightened sufficiently to prevent the work from moving and as these screws take a bearing against the rounded upper portion of the turntable they hold it firmly down in its seat. The broach is now pulled through by manipulation of the long lever. The connection between the lever and pinion stud under the slide being by pawl and ratchet the lever is adjustable immediately to any angle or height best suited to the operator and can thus be operated through the arc found most convenient and effective. (LL)