. Railway mechanical engineer . oving 1 5/16-in. of metal on eachside and at the same time, tool 5 is taking a rough facingcut. With the conclusion of the heavy roughing cuts thefirst finishing operation is to turn the 7^-in. external di-ameter and bore the 85 mm. and 6-in. diameter, leavingabout .007 in. for reaming with tool set up 5. These tools consist of a boring bar witii cutter for boring85 mm. diameter and a tool in the holder clamped to thel)ar for boring the 6-in. diameter all held in a turning toolliolder over the face of the turret. The tool for turning theexternal diameter is held
. Railway mechanical engineer . oving 1 5/16-in. of metal on eachside and at the same time, tool 5 is taking a rough facingcut. With the conclusion of the heavy roughing cuts thefirst finishing operation is to turn the 7^-in. external di-ameter and bore the 85 mm. and 6-in. diameter, leavingabout .007 in. for reaming with tool set up 5. These tools consist of a boring bar witii cutter for boring85 mm. diameter and a tool in the holder clamped to thel)ar for boring the 6-in. diameter all held in a turning toolliolder over the face of the turret. The tool for turning theexternal diameter is held in a fine adjustment tool holder,thus insuring quick and accurate setting. The boring toolsare also by screws operating underneath them. The two recesses are next faced and the 6-in. diameterundercut with the tools shown in tool set up-6 on thesquare turret. The chamfer is finished and also the frontface with tool 7 inverted in the holder on the back of thecross slide. This eliminates a great deal of chatter, which. Tool Set Up 6: Recess and Undercutting Operation is liable to occur on broad chamfers when machining fromthe front tool post. The 85 mm. and 6-in. bores are finish reamed with float-ing cutters, 8 and p, each of these reamers consisting oftwo high-speed cutters floating in a slot in a steel have adjusting screws which enable the cutters to bekept up in size and are held in position by two filister headscrews locating against a step in the back of the heads of the screws have a flat milled way across themand when the cutters require regrinding, the screws areturned until the fiat part clears the step in the cutters, whichare then withdrawn. This method helps to make the re-grinding a ven, quick operation. All boring tools are equipped with an oil feed from theturret giving a direct supply of lubricant to the point of cut-ting, thus insuring the maximum cooling and also lengthen-ins; the life of the tools. , HopPE
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
