US3988864A — Structure for and method of total form abrasion m…

Claim 1

Independent Claim 190 words

Structure for total form abrasion machining comprising a cutting master having an abrasive mirror image surface of an exact size form to be machined in a friable workpiece which is different in size than the form to be machined by an exact predetermined amount, means for supporting the cutting master over the friable workpiece, means operable between the cutting master and workpiece for imparting a relative rotary, orbital motion between the cutting master and workpiece, means also operable between the cutting master and workpiece for moving the cutting master and workpiece toward each other to engage the abrasive mirror image surface of the cutting master with the friable workpiece, means for flushing between thee abrasive surface of the cutting master and workpiece to remove particles of the workpiece abraded from the workpiece by the cutting master in the absence of a difference in electrical potential between the cutting master and workpiece and means operable between the cutting master and workpiece for locking the cutting master and workpiece in one position relative to each other in movement toward each other in response to the desired form being abraded into the workpiece.

Claim 2

Dependent Claim 190 words

Structure for total form abrasion machining comprising a cutting master having an abrasive mirror image surface of an exact size form to be machined in a friable workpiece which is different in size than the form to be machined by an exact predetermined amount, means for supporting the cutting master over the friable workpiece, means operable between the cutting master and workpiece for imparting a relative rotary, orbital motion between the cutting master and workpiece, means also operable between the cutting master and workpiece for moving the cutting master and workpiece toward each other to engage the abrasive mirror image surface of the cutting master with the friable workpiece, means for flushing between thee abrasive surface of the cutting master and workpiece to remove particles of the workpiece abraded from the workpiece by the cutting master in the absence of a difference in electrical potential between the cutting master and workpiece and means operable between the cutting master and workpiece for locking the cutting master and workpiece in one position relative to each other in movement toward each other in response to the desired form being abraded into the workpiece.

Claim 3

Dependent Claim 32 words

Structure as set forth in claim 1, and further including means operable between the cutting master and workpiece for providing a variable predetermined pressure between the cutting master and workpiece during machining.

Claim 4

Dependent Claim 59 words

Structure as set forth in claim 1, wherein the means for imparting relative rotary, orbital motion between the cutting master and workpiece comprises at least one eccentric structure operably located between a table carrying one of the workpiece and cutting master and a fixed support, bearing means supporting the table and drive train means for rotating the eccentric structure.

Claim 5

Dependent Claim 125 words

Structure as set forth in claim 3, wherein the eccentric structure comprises a sleeve, a spindle rotatably mounted in the sleeve having a recess in one end thereof concentric with the axis of rotation of the spindle, an eccentric member comprising a disc having a first cylindrical portion on one side thereof received within the recess of the spindle which has an axis of generation concentric with the axis of rotation of the spindle and an accentric cylinder on the other side of the disc which has an axis of generation which is offset with respect to the axis of generation of the first cylindrical portion, and second bearing means secured to the table and engaged with the eccentric cylindrical portion of the eccentric member.

Claim 6

Dependent Claim 31 words

Structure as set forth in claim 4, wherein the eccentric member is rotatable angularly about the axis of rotation of the spindle to adjust the rotary, orbital movement of the table.

Claim 7

Dependent Claim 51 words

Structure as set forth in claim 1, wherein the means for moving the cutting master toward the workpiece comprises an upper platen, a lower platen and a hydraulic ram positioned between the two platens for moving one of the platens toward and away from one of the workpiece and cutting master.

Claim 8

Dependent Claim 30 words

Structure as set forth in claim 6, wherein guide posts are secured to the movable platen for movement therewith which are guided at their opposite ends to prevent misalignment thereof.

Claim 9

Dependent Claim 30 words

Structure as set forth in claim 6, wherein hangers are secured to one of the platens for limiting the relative movement of the other of the platens in one direction.

Claim 10

Independent Claim 127 words

The method of total form abrasion machining comprising moving a cutting master having a mirror image abrasive surface thereon of an exact size form to be machined and which is different in size than the form to be machined by an exact predetermined amount toward and into engagement with a friable workpiece, imparting a rotary, orbital motion between the cutting master and workpiece with the mirror image surface in contact with the workpiece while flushing between the workpiece and cutting master in the absence of a difference in electrical potential between the cutting master and workpiece and locking the cuting master and workpiece in one position relative to each other in their movement toward each other in response to the desired form being abraded into the workpiece.

Claim 11

Independent Claim 127 words

The method of total form abrasion machining comprising moving a cutting master having a mirror image abrasive surface thereon of an exact size form to be machined and which is different in size than the form to be machined by an exact predetermined amount toward and into engagement with a friable workpiece, imparting a rotary, orbital motion between the cutting master and workpiece with the mirror image surface in contact with the workpiece while flushing between the workpiece and cutting master in the absence of a difference in electrical potential between the cutting master and workpiece and locking the cuting master and workpiece in one position relative to each other in their movement toward each other in response to the desired form being abraded into the workpiece.

Claim 12

Dependent Claim 25 words

The method as set forth in claim 9, and further including providing a variable predetermined pressure between the cutting master and workpiece during abrasion machining.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1979-11-02	1980-05-03	1980-11-02	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1983-11-02	1984-05-03	1984-11-02	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1987-11-02	1988-05-03	1988-11-02	$7700.00	Window Closed / Lapsed

Structure for and method of total form abrasion machining

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