The Rented & Margedant Wheel-boxing this machine, Fig. 0, the wheel is turned slowly to secure perfectly true center cutting, but the cutter is also rotated at high • _ . .
speed. There is a solid cast column, having a double slide, and set at a right angle to the center line of the whole machine. The bed plate resting on these slides can be moved back and forth across the machine by a large hand wheel in front, setting the whole mechanism of the cutter-bar in exact line with the center line of the wheel chuck, or within any distance of either side of this center line, The advantage arising from this adjustability of the carriage into or across the center line of the wheel chuck consists in admitting the use of cutters or reamers of the exact diameter of the hole desired, or in producing a hole of larger diameter than the cutter by moving it out of center. It also permits of enlarging or recessing the hole between the hub ends, cutting away the projecting ends of the spokes, so that they will not rest on the box, and producing offsets or shoulders in conformity with the shape of the box. For angular or tapering shapes of wheel boxes another adjustment is provided, independent of this, but which can be operated in connection therewith. It consists in arranging the lower adjustable sliding bed plate on its center with a strong circular turning slide, to which the long cutter-bar carriage is attached by compensating rotating slides, permitting the carriage to be swiveled. By this adjustment the long cutter bar slide on which the cutter-bar housings travel can be thrown into the desired angle for cutting the sides of the box angular or beveled, to conform to the various shapes of boxes. In connection with the movement of the bed plate across the machine, this adjustment admits cutting wide, narrow, or angular sides or offsets inside the hubs. An eccen tric clamp operated by a lever on the inside of the machine at the end of the radial plate, changes from straight to taper boring. The cutter-head housing is mounted on the long carriage slide by dovetailed slides, giving a movement of 20 in. back and forth
for the cutter•ar and its housing. This movement is under control of the operator, and may be made fast or slow by hand or by power, at will. The feed screw passes through the whole length of the carriage, and is constantly turned by a large pulley at the end of the carriage. There is in line with the carriage, a small hand wheel having a journal and a wheel fitting closely into the threads of the feed screw, and by turning this hand wheel, the cutter may be moved to and from the hub at the speed given by the hand motion on the feed wheel, so that the cutter may enter and return from the hub at fast or slow speed at will. By grasping and holding the hand wheel at rest, not turning it either way, the automatic feed is brought into action, and the cutter-bar started forward at a uniform speed given by the large feed pulley. The framing of the machine consists of two columns on the bed plate. The column bearing the chuck for the wheel is at the back or left-hand end, the right hand or front one carrying time boring tool. The wheel chuck consists of three well-con nected heavy arms, each having a movable clamp block operated by clamp screws meeting on the common central circular rack. By applying a socket wrench to the square end of any one of the three clamp screws, the three clamp blocks may be moved together or apart, alike 58 and at the same time. The wheel is clamped at the rim while resting on planed plates, thus securing a true position, being guided by three points of the rim. The wheel chuck has a hollow mandrel resting in two bearings, an adjustable rotating bearing being provided in its rear, taking the weight of the chuck from its bearings. The cutter-bar for finishing the front or end of the hub passes through the hollow chuck mandrel, and has its own bearings and pulley, and movement back and forth for cutting the " crozing " of the hub. It is operated by a treadle placed near the operator's stand at the front of the machine by the shifter bar cent-rolling the chuck belt.