Low mass spindle and Z-axis unit

Details Low mass spindle and Z-axis unit Low mass spindle and Z-axis unit

1990-10-24

1992-04-28

Briggs, William

Gear cutting, milling, or planing

Milling

Including means to infeed work to cutter

384107, 408 98, B23Q 306

Patent

active

051082365

ABSTRACT:
A spindle and Z-axis unit comprises a spindle housing and a hollow rotor shaft rotatable and axially movable with respect to the spindle housing. The rotor shaft carries a collet at its lower end for chucking a machine tool such as a drill bit. The tool is changed in the collet by pneumatic actuation of a diaphragm which actuates a push rod within the rotor shaft to move the collet axially against a spring bias to clamp and unclamp the tool. The shaft is moved in the Z-direction along with a thrust bearing assembly by a screw nut which actuates a road to move the rotor shaft in the Z-direction to drill a workpiece after a pressure foot has first been moved to clamp the workpiece with respect to the spindle. Thus, the moving weight or mass previously attributable to parts such as a spindle saddle and spindle housing can be eliminated without impairing the reliability and chucking force of the collet mechanism.

REFERENCES:
patent: 4088417 (1978-05-01), Kosmowski
patent: 4443141 (1984-04-01), Kosmowski
patent: 4761876 (1988-08-01), Kosmowski
patent: 4865494 (1989-09-01), Gudow
patent: 4932117 (1990-06-01), Reed

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