The jig is a special jig for performing internal spherical boring on a boring machine by using a rack and a gear pair mechanism (as shown in the figure). The positioning sleeve 3 of the clamp is fixed on the small carriage of the rotary disc, and the screw 4 fixes the cutter 2 to the positioning sleeve 3. When the rotary disc rotates, the cutter on the cutter 2 is inevitably driven to perform the constant speed cutting movement. The feed motion in the form of a circular arc is driven by the longitudinal feed motion of the machine spindle. The Morse taper shank 6 is assembled in the spindle taper hole. Transmission mandrel
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