. Railway mechanical engineer . eter, either 1 1/16-in. by 3-in., 1 1/16-in. by 4-in., or 1 1/16-in. by S-in., andis held in a clamp which provides for adjusting it to takecare of the vear on the dies as well as any variation in thelength of the rivets. The net weight of the machine whenequipped with the 1 1/16-in. bv 3-in. riveter is approximate-ly 173 lb. DUMORE PORTABLE GRINDER The Wisconsin Electric Company, Racine, Wis., hasplaced on the market a portable grinder which may be usedfor a large variety of purposes in the machine shop and toolroom. This grinder weighs 17 lb. and is designed t
. Railway mechanical engineer . eter, either 1 1/16-in. by 3-in., 1 1/16-in. by 4-in., or 1 1/16-in. by S-in., andis held in a clamp which provides for adjusting it to takecare of the vear on the dies as well as any variation in thelength of the rivets. The net weight of the machine whenequipped with the 1 1/16-in. bv 3-in. riveter is approximate-ly 173 lb. DUMORE PORTABLE GRINDER The Wisconsin Electric Company, Racine, Wis., hasplaced on the market a portable grinder which may be usedfor a large variety of purposes in the machine shop and toolroom. This grinder weighs 17 lb. and is designed to be usedin lathes, milling machines, shapers, etc. It is operateddirect from the lamp circuit, having a universal motor whichpermits it being used with alternating current as well as di-rect current. It comes provided with seven grinding wheels, rangingfrom y§ in. to Al/2 in. in diameter. It is provided with twospindles, one of which is used for surface grinding and theother for internal grinding. The speed of the spindle for. Portable Electric Grinder the external grinding is 10,000 , and that of theinternal grinding spindle is 30,000 The armature,pulleys and grinding wheels are dynamically balanced,thereby eliminating any vibration in the motor, and leavingthe ground surface free from chatter marks. This grindercan be used for grinding lathe centers, milling cutters, longi-tudinal and cylindrical grinding, internal grinding, and isespecially adapted for small work difficult to machine, yetwhere accurate surfaces are required. It is provided through-out with ball bearings and it is provided with a crossfeed which moves the motor longitudinally with its grindingwheels. THREADING MACHINE FOR HOLLOW SETSCREWS A threading machine has recently been placed on the mar-ket by the Landis Machine Company, Waynesboro, Pa.,which is equipped with special carriages for threading hol-low safety set screws. While primarily designed for thisclass of work, they may be empl
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
