Modern Mechanism; Exhibiting the Latest Progress in Machines, Motors, and the Transmission of Power

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1892 edition. Excerpt: ...the head-spindle. The patterns are cut from sheet-iron of the exact profile of the finished article. As the work turns, the rest bearing the tools has lengthwise traverse, and is made to advance or recede from the center by the sheet-iron form, thus producing articles of any desired contour, having all their sections circular. The Ober automatic lathe for turning irregular objects, such as spokes, has a mechanism which automatically adapts the speed of the feed-screw and the rotation of the pattern and stock to the diameter of the work being turned. This mechanism consists of a small frictionpulley, which, lying between two reverse cones and being caused to slide along their faces by a trip-lever and connecting-rod, transmits a variable velocity to the train of gears rotating the feed-screws, pattern, and stock. One variety of the Blanchard spoke-turning lathe has a horizontal frame or table with a lengthwise opening, through which vibrate the two end members of a frame which bears the stick from which the spoke is to be cut, and the solid iron form which is to be copied: these two being parallel, the form above the stock. Both the form and the stock arc mounted between centers, and have rotation at the same speed, by gearing driven by belted connections from below. At the back of the table, which has planed ways, is an upright, carrying cutters rotating upon a horizontal axis lengthwise of the machine and parallel, of course, to the axes of the stock and form. A projection on the frame bearing the cutter-head bears on the form and vibrates the frame from or toward the axis of the cutters, according as the form is greater or less in diameter. The carriage bearing the cutters has a lengthwise traverse, given by a cord and worm-feed. The...