Web thinning machine

Claim 2

Web thinning apparatus, comprising first means for mounting a drill and securing it against rotation on its own axis, second means for removing metal from said drill upon contact therewith; and third means for moving one of said first and second means with respect to the other along an elliptical path at a location where said drill intercepts said second means, whereby said second means removes a portion of the material from a drill held by said first means by sweeping across a portion of its web.

Claim 3

Web thinning apparatus according to claim 1 wherein said first means comprises an elongated tubular member for receiving the shank end of said drill, means mounting said tubular member for universal movement about a point on the principal axis thereof, and said third means comprises an eccentric drive connected to said tubular member at a location axially displaced from said point.

Claim 4

Web thinning apparatus according to claim 2 further comprising clamp means mounted to one end of said tubular member for engaging said drill near the point thereof.

Claim 5

Web thinning apparatus according to claim 3 wherein said clamp means comprises a pair of drill engaging members each adjustably movable in an arcuate path toward and away from said drill.

Claim 6

Web thinning apparatus according to claim 4 comprising spring means mounted in said tubular member for biasing said drill toward said drill engaging members.

Claim 7

Web thinning apparatus accordIng to claim 1 wherein said second means is a grinding wheel, and further comprising a motor drivingly connected to said wheel, a support for said motor, and means mounting said support for movement of said grinding wheel in a fixed plane toward and away from said drill.

Claim 8

Web thinning apparatus according to claim 6 comprising a lead screw for controllably moving said support.

Claim 9

Web thinning apparatus, comprising first means for mounting a drill and securing it against rotation on its own axis, second means for removing metal from said drill upon contact therewith; and third means for moving said first and second means with respect to each other along an intercepting path including an elliptical segment at a location where said drill intercepts said second means, said third means including, means mounting said drill for universal movement about a point on the axis thereof, an output shaft disposed in a plane of said axis and extending at an angle relative to said axis, a pin, a crank arm connected between said pin and said first means, and an orbit adjustor interconnected between said output shaft and said pin to permit adjustment of the size of said orbit.

Claim 10

Web thinning apparatus, comprising first means for mounting a drill and securing it against rotation on its own axis, second means for removing metal from said drill upon contact therewith; and third means for moving said first and second means with respect to each other along an intercepting path including an elliptical segment at a location where said drill intercepts said second means, said third means including, means mounting said drill for universal movement about a point on the axis thereof, an output shaft disposed in a plane of said axis and extending at an angle relative to said axis, a pin, a crank arm connected between said pin and said first means, and an orbit adjustor interconnected between said output shaft and said pin to permit adjustment of the size of said orbit.

Claim 11

Web thinning apparatus according to claim 8 wherein said orbit adjustor comprises a drive member, a driven member, said drive and driven members being connected together for mutual rotation and being respectively connected to said output shaft and to said pin at locations offset from the axis of mutual rotation of said drive and driven members, and means for securing said members together in an adjustable, fixed relative position.