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J. M a CD on AL D. Machines for Boring and Facing Cylinders

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J. M a CD on AL D. Machines for Boring and Facing Cylinders J. M A CD ON AL D. Machines for Boring and Facing Cylinders. No. 143,917, Patented Oct. 21, 1873. To re-22/602 4ae.9era 4. 6-2324. Ai. AdditH06RAPHIC (2A).YOSBoy's aroeiss, UNITED STATES PATENT OFFICE. JOHN MACDONALD, OF BOSTON, MASSACHUSETTS, IMPROVEMENT IN MACHINES FOR BORING AND FACING CYLINDERS. Specification forming part of Letters Patent, No. 143,917, dated October 21, 1873; application filed June 26, 1873. To all chon it may concern: the gear is loose; but when the clamp-nut 0 is Be it known that I, JOHN MACDONALD, of tightened the wheel is forced up against the Boston, in the county of Suffolk and State of head land head, wheel, screw, and clamp-nut Massachusetts, have invented an Improved turn as one. The Worm-wheel has a screw Tool for Boring and End-Facing Tubular Cyl thread meshing into the thread of a long feed inders; and I do hereby declare that the fol screw, p, and to the slide fare attached jaws lowing, taken in connection. With the drawings q r, each having a half-nut, these, jaws being Which accompany and form part of this speci fastened by screws s extending through slots fication, is a description of my invention suffi t, and the slots and nuts enabling the jaws to cient to enable those skilled in the art to prac be clamped against the screw, or drawn back tice it. therefrom. The screw p turns in suitable bear The invention relates to the construction of ings at its opposite ends, and at one end it a tool for boring the inner surfaces of tubular carries a pinion, u, that meshes into the gear, metal cylinders, and facing the ends thereof, rotation of the mandrel imparting rotation to the invention having particular reference to an the pinion, and axial rotation to the screw, Organization that permits both the inner fac upon which the pinion is fixed. When the ing and the end facing to be effected by one nut 0 is loosened and the half-nuts q r are tool. In my invention I use, in combination against the screw, rotation of the mandrel ro With a mechanism for imparting a revolving tates with it the slide if and its cutter, and rihovement and a movement of translation to the causes the feed-screw p to rotate axially as cutting-tool to carryit around within the tube well as with the mandrel, and by these move and progressively through it, a mechanism for ments the cutter travels in a circular path, imparting lateral or radial movement to the re and at the same time progresses end Wise volving tool, the translatory or shifting move through the cylinder, through which the man ment ceasing for the radial movement, and the drel extends, the movement of the cutter be radial for translatory or shifting movement; ing, in fact, a spiral movement. When the and my invention consists in a tool so mounted end of the tube is reached the half-nuts as to be capable of these independent move are drawn back, and the nuto is clamped ments for the inner surface of the tube, and a against the worm-wheel 7. The rotation of revolving and radial movement for the end the mandrel and consequent rotation of the face thereof. feed-screw p will then impart to the cutter a The drawing represents a mechanism em 1'evolving movementinone path or not Spirally, bodying my invention. and a lateral or radial movement, causing the Figure I shows the mechanism in plan. Fig. cutting-edge to act against the end face of the 2 is a section on the line aca, tube, the inner tubular face of which has been a denotes a mandrel axially mounted on cen turned down by the spiral movement of the ter pins b, one of which extends from a sta tool. For imparting more or less rapid rota tionary gear, c, and the other from a rotary tion to the screw to increase either the end head, d, having a pin, e, that strikes a projec movemeit or the lateral movement of the tool, tion from the mandrel, causing the mandrel to there may be several gears fixed on the end of be rotated with and by it. On this mandrel the mandrel, ald removable gears to applyin is an annular slide,f, upon one side of which terchangeably to the end of the screw to con is a sleeve, g. In this sleeve slides a tool nect with either of the maindrel-gears. To holder, h, to which the cutting-tool i is fast gripe the slide f the mandrel has a slot, , into ened, and this holder is made tubular and with which a tooth, c, extends from the slide. In a nut-thread, into which enters a screw, k. stead of the feed-screw pto effect the end move This screw passes through a head, l, confined ment of translation of the cutter in the tube, by a pin, In, and thence through a Worm-Wheel, the cylinder itself may have this movement, n, and a clamp-nut, o. The screw turns freely a screw-shaft with a short screw serving to in the gear, (which is nut-screw threaded,) when actuate the Worm-wheel n, 2 43,917 By this invention it will be readily seen that In combination with the cutting-tool, the with the same tool and the same organization mechanism, substantially as described and of mechanism, the tool may have the succes shown, for imparting to it successively revolv sive movements requisite for turning down the ing and shifting movements and revolving and inlaer surface of the tube and facing the end radial movements, for the purposes set forth. thereof. JOHN MACDONALD. A flange a, as seen in Fig. 3, may be at tached to the mandrel and bolted to the face Witnesses: ple support the mandrel in position. FRANCIs GoULD, Cat M. W. FROTHINGHAM. .
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