Burring Spindle Chucking Mechanism

A special ball chucking mechanism for use on the burring spindle permits opening the burring collet seven sixty-fourths of an inch on each side. This allows the burring collet to advance over shoulders to a machined diameter where greater chucking surface can be attained. This chucking mechanism is adaptable to either the third position burring attachment (see page 7) or the fifth position burring attachment (see page 8). NOTE: With some extra machining and special collets it is possible to open the collet .118 on a side.