Canadian machinery and metalworking (July-December 1917) . e cutting wheel,and is used on fluted reamers and mill-ing cutters, it is made, with both sharpand round corners. No. 6 is a cupped enables them to be used in any machines have devices for holdingthe diamond point to the wheel, but thewriter has observed that most grinder July 19, 1917. CANADIAN MACHINERY 71 operators prefer to hold the tool byhand, resting it upon some stationaryobject while the revolving wheel movesback and forth past the tool, or the toolmoves past the wheel. Truing with a diamond is not prac-ticable f
Canadian machinery and metalworking (July-December 1917) . e cutting wheel,and is used on fluted reamers and mill-ing cutters, it is made, with both sharpand round corners. No. 6 is a cupped enables them to be used in any machines have devices for holdingthe diamond point to the wheel, but thewriter has observed that most grinder July 19, 1917. CANADIAN MACHINERY 71 operators prefer to hold the tool byhand, resting it upon some stationaryobject while the revolving wheel movesback and forth past the tool, or the toolmoves past the wheel. Truing with a diamond is not prac-ticable for rough work, and where largeand coarse wheels are used, some othermethod of dressing the wheel must be propellant in cannon. Two of these plantsmanufacture cordite, which originallyis an English powder, having been firstmade about twenty-five years ago. Thename cordite was derived from the shapeof the finished powder, which resemblesa cord in appearance. It ranges in lengthfrom ten to twenty-six inches, dependingon the calibre of the gun in which it is. resorted to. A dressing tool made ofsteel or chilled iron disks that are freeto revolve on a central spindle is shownm Fig 88. This tool is pressed againstthe wheel and as the disks revolve theteeth strike the wheel and dislodge part-icles of emery thus making an even sur-face. A very useful dressing tool is alump broken out of an old wheel that iscoarse and harder than the wheel to bedressed. It should be kept movingaround, applying the different edges tothe. stone. Chatter and Its Causes It often happens that the wheel leavesa lot of peculiar wavy lines called chat-ter marks. These marks may be due toa number of different causes the namegiven to them suggests the cause, chat-ter. The grinding wheel spindle may b-loose In its bearinars and so chatter —the work itself may be slender and notproperly supported, or the wheel may betoo hard. Chatterino- may often be over-come by usisg a softer or a narrowerwheel,—of course the
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmachinery, bookyear19
