Automatic Gear-Cutting Machine

The automatic gear-cutting machine built by Gould and Eberhardt is shown in Fig. 285. It is of the same type as that built by Brown and Sharpe and possesses some excellent features. The gear blank and cutter are mounted in a similar manner, and the adjustments are made at much the same points. It is furnished with attachments for hobbing worm gears

Fig. 285. "New Type" Gear-Cutting Machine Entirely Automatic for Cutting Spur Gears Only.

Courtesy of Gould and Eberhardt, Newark, New Jersey and for cutting racks and internal gears. The one shown is not adapted for cutting bevel gears.

Becker Gear-Cutting Machine

The Becker Milling Company gear-cutting machine, shown in Fig. 286 is of the milling-machine type, designed by Amos H. Brainard, a builder of milling machines. The gear blank is mounted upon an arbor fitting a taper hole in the work spindle A or fixed upon an arbor and mounted on centers. The cutter is mounted upon a cutter arbor B, journaled in a sliding saddle C whose support D is pivoted to the machine knee so as to be adjustable to any angle required for cutting bevel gears as well as spur gears. The machine is entirely automatic in its action.

Bench Gear-Cutting Machine Fig

287 shows a bench gear-cutting machine built by the Sloan and Chase Manufacturing Company. It is intended for small gears only, and will not cut a gear larger than 3 1/2 inches in diameter. The same company build large machines, some of the Brainard type. The machine shown carries the gear blank on the spindle A, and the cutter on the spindle B. The indexing mechanism is at C, and the machine is entirely automatic. Fellows Gear Shaper. The Fellows gear shaper, shown in Fig. 288, is a distinct type in construction and action, the peculiar form of cutter used being shown in Fig. 277. The gear blank is mounted on the vertical work spindle A, which has on its lower end and within the casing B an indexing worm gear operated by the change gears at C. These are driven from the cone pulley D by means of the vertical shaft E, by a very gradual but continuous motion as the vertically reciprocating cutter F forms the teeth on the blank, gradually rotating in unison with the rotation of the blank. The reciprocating movement of the ram carrying the cutter is produced by suitable mechanism within the casing H operated by the shaft G. The machine is automatic in its action, and cuts spur gears and internal gears. A modified form machine is adapted to cutting the teeth of racks. The cutting action is that of planing.

Fis. 236. Gear Cutter Courtesy of Becker Milling Machine Company, Hyde Park, Massachusetts.

Gleason Gear Planer

In Fig. 289 is shown the Gleason gear planer which is an excellently designed machine for planing gear teeth with a single tool having a narrow, rounded cutting point. The gear blank A is mounted on a horizontal spindle having at its rear end suitable automatic indexing mechanism B. The tool C is carried in a reciprocating tool block D, which travels upon a swinging carriage pivoted at E directly under the apex of the base cone of the gear blank. The exact curve and direction of its feed are controlled by one of the formers F, G, H, mounted upon the triangular former carrier J, which may be rotated so as to bring either former up to its operative position, forming a rest and guide for the friction roller K on the outer end of the swinging carriage. Of the three formers, F is used for a roughing cut, and the other two for the upper and under sides of the tooth. Being placed at a considerable distance from the pivot upon which the carriage swings, they are made many times larger than the tooth, and great accuracy of form is thereby secured. The roughing cut is frequently made with a rotating cutter on an ordinary gear cutting machine. Modifications of this machine re built specially for cutting spur gears upon the same principle.

Fig. 287. Bench Gear Cutter Courtesy of Sloan and Chase Manufacturing Company.

Fig. 288. Gear Shaper Courtesy of Fellows Gear Shaper Company, Springfield, Vermont.