A tool for performing internal machining operations at an angle to the axis of a bore or tubular member

摘要

551,570. Drilling or milling machines. JESTICO, E. B. Dec. 13, 1941, Nos. 16097/41 and 11117/42. [Class 83 (iii)] In a device for performing drilling, counterboring, countersinking,. or like operations from the inside of a tubular member 3, a body or holder 2 having an opening 4 in one side is inserted in the work 3 and a rotary cutter 5 arranged at an angle to the body axis has an automatic feed in an outward direction. The end of the body is recessed to receive a holder 8 which is slotted at 10 to receive a spindle 7 carrying the cutter 5 and impeller 6. The holder has fluid ducts 13, 14 which direct fluid from the end 12 of the holder to the impeller at such an angle that the cutter is rotated and is also fed against a light return spring 16 so that the cutter removes inside burrs from a hole 15. The feed may be limited by shims. A collar 17 on the holder determines the position of the cutter. The tool may be a drill and may be arranged to drill holes at any required angle to the axis. In a modification, Figs. 6 and 7, to ensure equal removal of metal from the edges of the hole the cutter spindle 7 is rotatably mounted eccentrically in a slidable bush 19 which is rotatable by a separate impeller 22 so as to impart an orbital movement to the cutter, the depth of cut being controlled by a pin 21 engaging under the margin of the hole and fitted to a flange 23 on the bush.