APPLIANCE FOR INTERNAL MACHINING OF PIPES Russian patent published in 1995 - IPC

FIELD: metal machining. SUBSTANCE: spindle 17 has members 26 intended for its centering relative to inner surface of branch pipe 38 and positioned in radial holes 27. For machining branch pipe 38, spindle 17 is centered inside this branch pipe. To this end, handle 23 is rotated to displace nut 21 and bushing 30 with tapered portion 25, which shifts out centering members 26. This done, housing 1 is fixed in pipe 35. Then handle 23 is reversed to retract centering members 26 and push forward cutting tools 19. After that drive 16 of spindle 17 is switched on to start machining. EFFECT: increased accuracy of machining and improved reliability. 1 dwg