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Air Bearing for Position Compensation in Multi-Spindle Drills

IP.com Disclosure Number: IPCOM000040743D
Original Publication Date: 1987-Dec-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Dierich, D: AUTHOR [+3]

Abstract

For automatically changing the drill of, say, multi-spindle drilling machines for circuit boards, highly accurate tolerances are required between spindle and tool. By providing an air bearing for each tool holder, adjustment tolerances are readily compensated. The air bearing, comprising, for example, a carbon graphite bushing and having a play of 0.05 to 0.08 mm, radially and axially compensates for any play between drill and spindle. Lateral stagger and inaccuracies, caused by simultaneously exchanging a number of drills ranging from, say, 5 to several hundred at a center spacing of about 15 mm, are compensated independently of each other by the play within the air bearing. After the drills have been exchanged, the self-centering effect of the air bearing pressure restores the tool to its original center position.

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Air Bearing for Position Compensation in Multi-Spindle Drills

For automatically changing the drill of, say, multi-spindle drilling machines for circuit boards, highly accurate tolerances are required between spindle and tool. By providing an air bearing for each tool holder, adjustment tolerances are readily compensated. The air bearing, comprising, for example, a carbon graphite bushing and having a play of 0.05 to 0.08 mm, radially and axially compensates for any play between drill and spindle. Lateral stagger and inaccuracies, caused by simultaneously exchanging a number of drills ranging from, say, 5 to several hundred at a center spacing of about 15 mm, are compensated independently of each other by the play within the air bearing. After the drills have been exchanged, the self-centering effect of the air bearing pressure restores the tool to its original center position.

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