290

Class 6.—MANUFACTURING MACHINES AND TOOLS.

North Areas A. B. 10 to 31; C. D. E. 1 to 10, & 19 to 33 ; G. H. 25, 26.

[United

lifted and placed on the table of the ordinary drillingmachine. A pit should be provided in front for objectsof great length.

Punching and shearing machine, fig. 9, for hand orpower, with separate slides for the two operations, oneon each side of the machine, worked by eccentrics.Apparatus for raising the punch quickly without stoppingthe machine. Small shears for cutting off bars of anylength. Punching and shearing, or bar cutting, may becarried on at the same time without interruption.

Fig. 9.

Whitworth’s Punching and Shearing Machine.

Hand-punching and shearing machine, with single slide,worked by eccentric, only one process being carried onat a time.

Self-acting wheel-cutting and dividing machine, fig. 10,for bevel spur and worm wheels, with headstocks anddividing wheel, moveable horizontally for different dia-meters of wheels, cutter frame, with universal adjustment,self-acting traverse for cutter, self-adjusting driving pul-leys, change wheels, for all numbers up to 100.

Fig. 10.

Whitworth’s Selfacting Wheel-cutting and Dividing Machine.

Self-acting bolt-head and nut-shaping machine, fig. 11,with two circular cutters, for shaping two sides at once,two concentric chucks, for two objects to be operated uponat the same time. Duplicate compound slides, with in-dependent self-acting and self-disengaging motions toprevent injury from the cutters.

Fig. 11.

Whitworth's Self-acting Bolt-head and Nut-shaping Machine.

The chucks are respectively placed on opposite sidesof the centre of the circular cutters, by which the forcesare balanced, and a much greater quantity of work isproduced than if one chuck only were used. Thesemachines are applicable for shaping and squaring nuts,ends of shafts, &c. The concentric chucks are removeable,so that other work may be shaped and squared.

Patent screwing machine, for bolts and nuts, withhollow mandril, die-holder, with four radial dies, two oneach side of the centre, complete sets of dies and taps,with chucking apparatus for bolts and nuts. The radialdie-holder is similar in principle to the patent guidescrew stock. The dies are cut by master taps, of doublethe depth of thread larger in diameter than the workingtaps, so that the circle of the dies in contact is the samesize as the screw blank. A perfect guide is thus obtained,and a thread of correct pitch is formed at the commence-ment. The inner edges of the dies being filed off to anacute angle, they cut with ease without distorting thethread; and by the direction in which the dies aremoved, their cutting power is preserved for the full depthof thread. Their action in cutting is similar to thecltasing tool, which they resemble in form, and may ialike manner be sharpened on a grindstone.

Patent screwing apparatus, fig. 12, including the patentguide screw-stock and dies, working taps, master taps>for cutting up the dies, hobs, for cutting screw too ^and case-hardened tap wrenches. The dies of the ® cre | sstock are cut by a large master tap, and their a ctl °h. gthe same as explained in the bolt-screwing machine. 1diameter of the working taps are made to standard gang a [the angle of the thread in all cases is 55°, rounded otop and bottom to two-thirds of a complete align ^thread; small fractional pitches are avoided, and __principle of uniformity in pitch, form of thread, andmeter, is rigidly adhered to.

Measuring machine, and standard yard measure.

Internal and external standard cylindrical gaug e8 >^_sizes from l-8th to 6 inches diameter, tested by thesuring machine.

Set of stepped gauges, external only from6 inches.

Patent knitting machine, knits one stitch at a ^ gIsimilar to hand knitting: may be worked >ypower.