. Mechanical appliances, mechanical movements and novelties of construction; a complete work and a continuation, as a second volume, of the author's book entitled "Mechanical movements, powers and devices" ... including an explanatory chapter on the leading conceptions of perpetual motion existing during the past three centuries. MILL AND FACTORY APPLIANCES AND TOOLS, ETC. 291 758. CENTERING DEVICE FOR A DRILL PRESS. Thedevice consists of a drill shank, A,made to fit the drill spindle; a centering vise with three jaws^ two of which areindicated by C, and a chuck to holdthe combined drill and r
. Mechanical appliances, mechanical movements and novelties of construction; a complete work and a continuation, as a second volume, of the author's book entitled "Mechanical movements, powers and devices" ... including an explanatory chapter on the leading conceptions of perpetual motion existing during the past three centuries. MILL AND FACTORY APPLIANCES AND TOOLS, ETC. 291 758. CENTERING DEVICE FOR A DRILL PRESS. Thedevice consists of a drill shank, A,made to fit the drill spindle; a centering vise with three jaws^ two of which areindicated by C, and a chuck to holdthe combined drill and reamer centering jaws are closed on thework by screwing down the cone-shaped piece, B, which forces the upper ends of the jaws apart andcloses the lower ends on the work. The jaws are retracted by a coiledspring passing through their upper ends. The jaws do not rotate withthe centering drill, but remain in a fixed position, being mounted on asleeve in which the drill shank 759swung . BORING ELLIPTIC CYLINDERS. B D is a boring baron centers on a lathe. A C is an arm holding at its end C a boringtool. When the bar is rotated the point C describesa circle. A casting, M, which is to be bored elliptic-ally, is secured rigidly to a carriage capable of beingmoved in the direction of E F, which is the longi-tudinal axis of M and passes through A. Conse-quently, if the boring bar is rotated on its centersand the work fed gradually, in the ordinary way,along axis E F, the cutting tool, at each revolution,describes a circle; but, because of the inchnationof axis E F, when the tool occupies the positionshown in dotted lines, the boring will be achievedand the end view of the casting will show a perfectelliptical bore.
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Keywords: ., bookauthorhiscoxgardnerdexter18, bookcentury1900, bookdecade1910
