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Bearing Collapse Top Reference Disclosure Number: IPCOM000038056D
Original Publication Date: 1989-Oct-01
Included in the Prior Art Database: 2005-Jan-31

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Clothier, RW Kulesza, JD [+details]


In the drilling of printed circuit panels the detection of the top surface of the panel relative to the drill tip is sometimes required, but detection is difficult to achieve with reasonable repeatability. The detection of the collapse of an air thrust bearing in the spindle mechanism accomplishes this by giving an accurate sense of drill tip position because of the direct coupling between the drill tip and bearing. The bearing collapse can be detected in the following manner. (Image Omitted)