DEVICE FOR HOLE BORING IN TUBE GRIDS AND PARTITIONS Russian patent published in 2008 - IPC B23B49/02 

FIELD: technological processes.

SUBSTANCE: device includes jig plate with guiding orifices. The jig plate carries at least six jig bushes with collars, one end of which is set against the lower horizontal plate surface and another end is set against processed part, and with thread on outer cylindrical collar surface for screwing of pins for jig plate basement at outer cylindrical tube grid or partition surface. The collar length varies from one third to one boring diametre length. The plate carries also jig bushes positioned on central mutually perpendicular axes, including the central hole, with collars, both ends of which are set against the upper horizontal plate surface and indicate position of central axes of tube grids or partitions.

EFFECT: increased efficiency of hole processing.

3 dwg