. Railway mechanical engineer . place. The time re-quired for changing the tank is only from three to fiveminutes. The steadyrests are of improved have thumb-screw stop adjustment for size of workand are attached or detached quickly by a lever and work shoes and work-shoe holders are interchangeablewith previous types of Norton grinding machines. Special attention has been paid, in the designing of the machine, to the lubrication of bearings. With the exceptionof a few places where it is not essential that the oiling befrequent, all the bearings are automatically oile
. Railway mechanical engineer . place. The time re-quired for changing the tank is only from three to fiveminutes. The steadyrests are of improved have thumb-screw stop adjustment for size of workand are attached or detached quickly by a lever and work shoes and work-shoe holders are interchangeablewith previous types of Norton grinding machines. Special attention has been paid, in the designing of the machine, to the lubrication of bearings. With the exceptionof a few places where it is not essential that the oiling befrequent, all the bearings are automatically oiled. Thereare also 47 ball bearings throughout the machine, all ofwhich are enclosed in oil baths. Si.\ work speeds are provided ranging from 53 to 167r. p. m. There are seven speeds for the work talile. Atruing speed of ft. per min. can be obtained and regularspeeds vary from 10 to 32 ft. per min. The length of thetable is 8 ft. 10^ in. Cylindrical work 72 in. long andup to 10 in. in diameter can be ground. Each tooth in the. view of Wheel-head Showing Bearing Adjustment Screws index gear represents a work diameter reduction of .00025in. and there is an automatic feed range from .00025 in. diameter reduction at each reversal of the 15-hp. motor, designed to operate at a constant speed of1,200 r. p. m., is required to drive the new Norton grinder. Collapsible Tap of Simple Rugged Design THE original and outstanding feature of the new col-lapsible tap, made by die Rickert-Shafer Company,Erie, Pa., is the method of withdrawing the chaserswhen the work has been tapped to the required depth. Themanufacturers claim it to be positive in action, inasmuch that the chasers will be released at exactly the right illustrations show the manner in which this is ac-complished. At the point of release the force of the cut pullsthe head from the locking pins and revolves it. This actioncauses the cams on the core to act and pull the core back,drawing the chasers in t
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
