. Railway mechanical engineer . evers are emplo\ed in place of the dogs. -Manipulation of the controlling levers is extremelv simple,and the ease and rajndity with which thev mav lieoperatedIS in some faster than when it is fullv automaticallyoperated. By means of the hand-control levers, the machinemay be operated as a plain milling machine. The constant speed type of drive permits the machine tobe driven by a belt directly from the ma-n shaft to the .single- 410 RAILWAY MECHAXICAL EXCilXKHR \ 94. Xo. 6 driving pulley. Mounted u[)on the drive shaft are the fric-tion clutches for st
. Railway mechanical engineer . evers are emplo\ed in place of the dogs. -Manipulation of the controlling levers is extremelv simple,and the ease and rajndity with which thev mav lieoperatedIS in some faster than when it is fullv automaticallyoperated. By means of the hand-control levers, the machinemay be operated as a plain milling machine. The constant speed type of drive permits the machine tobe driven by a belt directly from the ma-n shaft to the .single- 410 RAILWAY MECHAXICAL EXCilXKHR \ 94. Xo. 6 driving pulley. Mounted u[)on the drive shaft are the fric-tion clutches for starting, stopping and reversing the spindleautomatically, and this arrangement relieves the spindle ofall unnecessary weight. Power is transmitted from the shaftto the spindle through a series of sjiiral bevel gears, whichfurnishes a smooth and powerful drive. .other advantage of the constant speed type of drive isthe complete separation of the spindle speeds and the tablefeeds, permitting any combination of the two within the. Fig. 4—View Showing Adaptability for a Vertical MillingAttachment capacity of the machine. Variations of the spindle speedsare obtained through change gears, giving 16 changes ofspeeds in geometrical progression from 28 to 695 ineither direction. feeds are positive and are entirelyindependent of the spindle speeds. There are 12 changes,ranging from in. to in. per minute. This pro-vides a range of in. to in. per revolution of thespindle for small mills and in. to in. per revo-lution of the spindle for large mills. Both sets of changegears are contained within heavy cast iron cases and are madereadily accessible by doors, upon which are cast tables of the ])n)per gears for the various spindle .speeds and table spindle speed change gear case is shown in Fig. 3. When motor drive is desired, the motor is placed at tiierear of the machine where it is completely out of the wayand does not increase
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
