The Wheel and cycling trade review . s ofvarious sizes within its capacity, and these arefitted at the factory to cups and cones fur-nished by the bicycle-maker. One movementof a lever serves to tighten or loosen the chuckas desired. The revolving head shown in the centre of thebed has a taper hole, into which fits a speciallydesigned chuck so arranged that hubs may beheld by the barrel or by the flange. If but oneemery wheel is used, the head is swivelled halfway round when one bearing is ground, in or-der to grind the bearing at the other end ofthe hub. Sometimes two emery wheels areused, on
The Wheel and cycling trade review . s ofvarious sizes within its capacity, and these arefitted at the factory to cups and cones fur-nished by the bicycle-maker. One movementof a lever serves to tighten or loosen the chuckas desired. The revolving head shown in the centre of thebed has a taper hole, into which fits a speciallydesigned chuck so arranged that hubs may beheld by the barrel or by the flange. If but oneemery wheel is used, the head is swivelled halfway round when one bearing is ground, in or-der to grind the bearing at the other end ofthe hub. Sometimes two emery wheels areused, one at each end of the hub, in whichcase it is not necessary to revolve the revolving head was formerly driven bya belt, but it is now propelled by a frictionwheel shown in the rear, and which is causedto engage with the head by a lever shown infront, which actuates a cam wheel on the backof the machine. The emery wheel slide rest was formerlymade so that the spindle moved back andforth by means of a lever. This exposed some. bearing surfaces to the action of emery present device of causing the whole restto move on protected slides by means of a rackand pinion movement gives very much betterresults. The revolving head and the emery wheelspindle are both equipped with ball bearingsaccurately ground. This permits a very highspeed to the emery wheel without heating, andgives a better chance to protect the bearingsfrom the entrance of emery dust. The above description will be sufficient to en-able any one interested to understand bymeans of an examination of the drawing themethod of operating the machine. The makersstate that they have sold nearly 200 of thesemachines to cycle manufacturers in the UnitedStates, France, England and Germany. Thismachine, together with a complete line ofgrinding and polishing machinery, is made bythe Diamond Machine Company, of Provi-dence, R. I. The Welivar Manufacturing Company, ofPhillipsburg, Penn., which recently embarkedin the m
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectcyclist, bookyear1888
