. Railway mechanical engineer . e linerand the driving wheel hub with the shoe and wedge in placeto permit the removal of the liner lugs from the pockets inthe face of the box. Their use is desirable, however, to pre-vent undue pounding of the liner between box and hub. OCTOBEK, 1917 RAILWAY MECHANICAL ENGINEER 599 ACORN DIE AND HOLDER A die and holder has recently been developed by theGreenfield Tap & Die Corporation, Greenfield, Mass., whichpermits of adjustment without in any way impairing theaccuracy of the lead. The die is also so designed that itmay readily be removed from the holder and
. Railway mechanical engineer . e linerand the driving wheel hub with the shoe and wedge in placeto permit the removal of the liner lugs from the pockets inthe face of the box. Their use is desirable, however, to pre-vent undue pounding of the liner between box and hub. OCTOBEK, 1917 RAILWAY MECHANICAL ENGINEER 599 ACORN DIE AND HOLDER A die and holder has recently been developed by theGreenfield Tap & Die Corporation, Greenfield, Mass., whichpermits of adjustment without in any way impairing theaccuracy of the lead. The die is also so designed that itmay readily be removed from the holder and reground. By referring to the dissembled view of the die holder, itwill be seen that the die is secured to the holder by an ad-justing cap which fits over the die and is threaded onto thebody of the holder. The cap is provided with holes in thewalls to permit the of chips which may collect inside thebase of the die. The adjusting cap is secured to the body inany desired position by a nut lock. The nose of each die is. The Acorn Die and Holder Assembled beveled to an angle corresponding to that on the inside coneof the adjusting cap. Both beveled surfaces are ground,thus assuring perfect contact and accuracy of radial adjustment of the lands is accomplished by turn-ing the adjusting cap on the thread of the body, the bevelon the inside of the cap a uniform pressure upon allthe lands and drawing them together to whatever diametermay be required. It is evident that the lands are movedradially and that their angular spacing is unaffected by theadjustment, a condition which does not hold for either theround split die or dies in which the prongs are held in asplit ring. The tracking of the lands, therefore, alwaysremains perfect. The body, the stem of which is inserted in the shank, is SHANK LOCK ADJUSTING STOP SPRING / ■■- BODY ^ NUT DIE _ CAP .NUT / /
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
