Patent GB-190723660-A (GB)
Title: Improvements in Machines for Grinding the Rings of Ball Bearings.
Inventor: RANSOME ALLEN
Filed: 1907-10-26
Granted: 1908-09-17
Abstract: 23,660. Ransome, A., and Jones, W. T. Oct. 26. Grooving ; surfacing.-The grooved rings forming the races for ball bearings are ground on their outer and inner faces simultaneously by two grinding-wheels mounted in adjustable brackets on the frame carrying the work, one reciprocating in a direction parallel to its axis and grinding the outside of the ring, and the other working in a circular guide to grind the grooves inside the ring. A gauge is provided to position accurately the grinding-wheel that grinds the grooves in the rings. The work is mounted in a chuck b carried by a headstock a, Fig. 4, mounted on the frame e, Fig. 1, which also carries on adjustable brackets f, g grinding - wheels k, k<1>. Thegrinding-wheel k<1> is reciprocated parallel to the axis of the work by a crank - disk u and connecting - rod w, operated by worm gearing. Thegrinding-wheel k is mounted on a compound slide h, which is carried by a table pivoted atj to a slide carried by the bracket f and is oscillated about its pivot by a pinion m gearing with a segmental rack l on the table. The pinion mis mounted at the end of a telescopic shaft n having universal joints o, which is driven through a pinion p at its lower end by a rack q oscillated through worm gearing r by belts on the pulleys s. Stops t on the bar t<1> cause the automatic shifting of an open and a crossed belt on the pulleys to drive the shaft s<1>, first in one and then in the other direction. The grinding-wheel k can be adjusted on its slide so that its edge comes directly over the pivot j in which case the groove ground corresponds to the edge of the wheel. If, however, the grinding-wheel is brought out of centre and the slide oscillated as described above, it grinds a larger radius. To grind the outer ring a' of the bearing, in which the grooves are on the inside, the machine is arranged as shown diagrammatically in Fig. 4. To grind the inner ring a<2>, in which the grooves are on the outside, an auxiliary slide d<1>, Fig. 5, is substituted for the slide d, which carries a grinding- wheel adapted to grind the interior of the ring. To set the grinding-wheel k accurately in position when grinding races with two grooves in order to have the grooves in corresponding positions on the inner and outer rings, a gauge is provided comprising a stop x, Fig. 7, on the grinding wheel-slide, and a stop C on an adjustable bracket on the frame of the machine. The stop C, which is pivoted at D and has two arms E, F, the difference in length of which is equal to the distance between the centres of the grooves, is carried by a plunger A mounted to slide in an extension R. The other end C of the plunger bears against a lever H the motion of which through the medium of multiplying levers J, L is indicated on a scale M. The plunger is pressed forward by a spring N and the whole can be adjusted by a screw P. To use the stop merely to replace the grinding - wheel when it has been removed for inspection, the stop C is used without turning it about its pivot.