Apparatus for milling a gear for a double enveloping worm gear drive
OwnerBernard H. Johnsoninventor
Life of this patent
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Abstract
Apparatus for milling a gear for a double enveloping worm gear drive. A rotating milling cutter is advanced toward a workpiece spindle to mill a flank of a gear tooth by tilting the milling cutter supporting frame about an axis that passes through the axis of rotation of the workpiece spindle to form a predetermined change in the helix angle from the top to the root of the tooth. The initial tilt setting of the cutter is adjusted to suit the root helix angle.
Claims17
A method for cutting the flank of a straight-sided tooth of a double-enveloping worm drive gear, comprising the steps of:
- supporting a gear blank having a first axis of rotation in a fixed position during cutting, and a base circle with a center lying on said first axis;
- and
- engaging a cutting member rotating about an axis with the gear blank along a first linear path of motion tangential to said base circle while progressively tilting the cutting member as it is being moved in a rotating cutting motion from the tip to the root of the tooth being formed.
Apparatus for milling the flank of a straight-sided tooth of double-enveloping worm drive gear having an axis of rotation and a base circle with a center tying on said axis of rotation, comprising:
- a base;
- an indexable workpiece supporting spindle mounted on the base;
- first means for mounting the gear blank on the workpiece supporting spindle;
- a milling cutter, and second means for rotating the milling cutter in a rotating cutting motion;
- third means on the base for moving the milling cutter in cutting engagement with the gear along a linear path of motion tangential to the base circle of the gear blank while the gear blank is held stationary by the supporting spindle;
- and
- fourth means for progressively tilting the milling cutter as it is being moved from the tip to the root of the tooth being formed on the gear blank.
Dependencies are inferred from the claim text.