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Disclosed is a device that is used in a matrix drilling machine spindle that allows misalignment between precise elements and the rest of the machine.
English (United States)
This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately
79% of the total text.
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Air Preload Alignment Device
Disclosed is a device that is used in a matrix drilling machine spindle that
allows misalignment between precise elements and the rest of the machine.
A ball joint 5 in the spindle is necessary because the thrust air bearings 4
need to come to an equilibrium position before the rotor 6 turns at 100,000 rpm.
Any type of dimensional "tilt" between the rotor and the air bearing surfaces 4
would result in a lower rpm at the rotor. If the rotor was allowed to touch the
bearing surface at 100,000 rpm, one of the materials would melt and start galling
and the rotor would quickly stop.
Blind hole drilling has become a very important process, partly because of
surface mount components. The depth of blind hole drilling must be accurately
maintained for dense electronic packaging and for noninterference with different
conductive layers in the board. A preloaded ball joint would be ideal for
accurately drilling to a depth. However, preloading causes some sticking action,
which may cause a lack of misalignment for the thrust assembly.
The best of both worlds is the solution. The ball joint 5 as shown, has a loose
fit. It is mounted in the machine in a relaxed condition. The air is then energized
to the journal bearing (not shown) which aligns and stiffens the shaft of the rotor.
Air is also supplied simultaneously to the thrust bearings which (if the ball joint is
loose) aligns perfectly and stiffens the rectangular thrust assembly. The turbine