Cutting by use of rotating axially moving tool – Means to drive tool
Patent
1998-09-22
1999-12-07
Pitts, Andrea L.
Cutting by use of rotating axially moving tool
Means to drive tool
409231, B23B 3910
Patent
active
059972238
ABSTRACT:
A spindle capable of operation at 200,000 revolutions per minute (RPM) with a reciprocating shaft design to minimize the moving mass. The spindle has a ceramic spindle shaft to decrease the moving mass and increase the shaft stiffness for better dynamic stability. The spindle employs a built-in linear motor to provide direct drilling motion to move the shaft along the axis, and a permanent magnet DC brushless motor to rotate the spindle shaft. The linear motor is coupled to the shaft by a combination of an air bearing and a magnetic thrust bearing to reduce the size of the thrust area for better dynamic stability and reduction in stresses of material. A double gripping centrifugal chuck is mounted in the hollow ceramic shaft, and reduces drill bit runout.
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Bhargava Adesh
Electro Scientific Industries Inc.
Pitts Andrea L.
Roberts Larry K.
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