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A device for positioning a workpiece includes a socket body rotatably held on a metallic ball by an array of permanent magnets arranged into a partial socket. An air delivery system controls a flow of air passing between the magnets and the ball to alter the friction between the socket body and the

A device for positioning a workpiece includes a socket body rotatably held on a metallic ball by an array of permanent magnets arranged into a partial socket. An air delivery system controls a flow of air passing between the magnets and the ball to alter the friction between the socket body and the ball. A positive flow of air into the socket reduces the friction, allowing the workpiece to be more easily rotated during repositioning, whereas drawing air away from the socket produces a partial vacuum which increases the friction, causing the socket body to be locked in a single position on the ball.

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What is claimed is: 1. A device for positioning an object such as a part, comprising: a body adapted to mount the object thereon; an array of magnets carried on the body and spatially arranged to comprise at least a partial socket; a ball at least partially rotatable within the socket, said ball fo

What is claimed is: 1. A device for positioning an object such as a part, comprising: a body adapted to mount the object thereon; an array of magnets carried on the body and spatially arranged to comprise at least a partial socket; a ball at least partially rotatable within the socket, said ball formed of material magnetically attracted to the magnets, said socket defined by a concave surface adjacent an outer spherical surface of said ball, said socket moveable around an outer spherical surface of said ball; and, an air delivery system adapted to create a flow of pressurized air to a space at an interface between the socket and the ball in order to selectively change friction between the magnets and the ball during rotation. 2. The device of claim 1, wherein the magnets are permanent magnets. 3. The device of claim 1, wherein the body includes an exterior surface configured to have the object mounted thereon. 4. The device of claim 1, wherein the air delivery system comprises: a source of compressed air comprising said pressurized air; and, a pneumatic delivery system adapted to deliver said pressurized air from the source to said space, said pressurized air reducing the friction between the magnets and the ball. 5. The device of claim 1, wherein one end of each of said magnets is adjacent to the outer spherical surface of said ball. 6. The device of claim 5, wherein said one end of each of said magnets conforms to the spherical outer surface of said ball. 7. The device of claim 1, further comprising a support fixed to said ball. 8. The device of claim 7, wherein said ball is fully spherical except for said support. 9. The device of claim 8, wherein said socket is moveable around said outer spherical surface of said ball limited only by said support. 10. The device of claim 1, wherein said space comprises at least one channel in said concave surface for distributing the flow of air across the socket. 11. A device for positioning an object such as a part, comprising: a body having a first side adapted to mount the object thereon; an array of magnets carried on a second side of the body and spatially arranged to comprise at least a partial socket; a ball at least partially rotatable within the socket, said ball formed of material magnetically attracted to the magnets, said socket defined by a concave surface adjacent an outer spherical surface of said ball; a support fixed to said ball; wherein said socket is moveable around said outer spherical surface of said ball limited only by said support; and, an air delivery system adapted to create a flow of pressurized air to a space at an interface between the socket and the ball in order to selectively change friction between the magnets and the ball during rotation. 12. The device of claim 11, wherein the magnets are permanent magnets. 13. The device of claim 11, wherein the air delivery system comprises: a source of compressed air comprising said pressurized air; and, a pneumatic delivery system adapted to deliver said pressurized air from the source to said space, said pressurized air reducing the friction between the magnets and the ball. 14. The device of claim 11, wherein said space comprises at least one channel in said concave surface for distributing the flow of air across the socket. 15. The device of claim 11, wherein one end of each of said magnets is adjacent to the outer spherical surface of said ball. 16. The device of claim 15, wherein said one end of each of said magnets conforms to the spherical outer surface of said ball. 17. A device for positioning an object such as a part, comprising: a body having a first side adapted to mount the object thereon; an array of magnets carried on a second side of the body and spatially arranged to comprise at least a partial socket; a ball at least partially rotatable within the socket, said ball formed of material magnetically attracted to the magnets, said socket defined by a concave surface adjacent to an outer spherical surface of said ball, wherein one end of each of said magnets is adjacent to and conforms to said outer spherical surface of said ball; a support fixed to said ball; wherein said socket is moveable around said outer spherical surface of said ball limited only by said support; and, an air delivery system adapted to create a flow of pressurized air to a space at an interface between the socket and the ball in order to selectively change friction between the magnets and the ball during rotation. 18. The device of claim 17, wherein the magnets are permanent magnets. 19. The device of claim 17, wherein the air delivery system comprises: a source of compressed air comprising said pressurized air; and, a pneumatic delivery system adapted to deliver said pressurized air from the source to said space, said pressurized air reducing the friction between the magnets and the ball. 20. The device of claim 17, wherein said space includes at least one channel in the concave surface for distributing the flow of air across the socket.