Gear cutting – milling – or planing – Milling – Cutter spindle or spindle support
Reexamination Certificate
1997-09-15
2001-02-27
Howell, Daniel W. (Department: 3722)
Gear cutting, milling, or planing
Milling
Cutter spindle or spindle support
C409S134000
Reexamination Certificate
active
06193450
ABSTRACT:
BACKGROUND OF THE INVENTION
Every machine tool with a gear driven spindle must have a small amount of clearance between adjacent gears. Whenever machining an irregularly shaped workpiece or using a multi-inserted milling cutter, the otherwise constant force of the gear driven spindle is interruped as the cutting tool travels in and out of the workpiece. When the cutting tool moves out of the workpiece the clearance between the gears causes them to momentarily disengage only to violently re-engage with the impact of the cutting tool upon the workpiece. This repetitive banging has varying detrimental results; 1) Production is less because the speed and feed rates must be slowed down 2) Cutting tool expense is higher because of impact induced tool failure 3) Machine parts must be replaced more frequently because of impact forces and 4) Operator is at a higher safety risk. Interrupted cuts have been a generally accepted necessary evil since the invention of machine tools There is, to my knowledge, no previous or existing remedy to this problem, other than this invention.
BRIEF SUMMARY OF THE INVENTION
The Interrupted Cut Pacifier (ICP) is a remarkably simple invention that maintains constant engagement of the machine spindle gears by applying external force to the rotating spindle. All of the detrimental conditions described above simply go away. In fact, speeds and feeds may be increased.
An adapter plate is mounted to the machine spindle housing. The ICP is then attached to the adapter plate. When machining an interrupted cut, the operator activates the device to immediately stop the impact induced banging of the spindle gears.
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