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Additional resources for Air Bearing Application and Design Guide Rev E - New Way (mfg)

Sample text

An efficient system ensures minimum pressure loss, removal of contaminants such us water, oil, dirt, rust, and other foreign materials. Particles will not affect the performance or life of New Way® Porous Air Bearings, but oil and water will.

The outside atmosphere effectively presses down on the bearing creating a preload force equal to the projected area of the vacuum pocket multiplied by the pressure differential. It is relatively easy to create a vacuum of 20 inches of mercury (negative 10 psi), almost two-thirds of a perfect vacuum. A large monolithic VPL, for example 12 inches square, can create over 800 pounds of preload force and a stiffness of well over 2 million pounds per inch, with only a single pound of payload. The advantage of vacuum preloading is that it creates a preloading force on the bearings without adding mass.

This arrangement though is not recommended. When four bearings are used the situation is much improved, but until L equals or exceeds W the system will be relatively unstable. com Page 37 of 68 New Way Air Bearings Air Bearing Application and Design Guide This guidance system is inherently stable, the two bearings will always be trying to find the shortest distance across the guide way. The higher the preload force the higher the squaring force will be. © 2006, New Way Air Bearings Air Bearing Application and Design Guide – Revision E Page 38 of 68 Air Bearing Application and Design Guide New Way Air Bearings This design suffers from gantry splay.

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Air Bearing Application and Design Guide Rev E - New Way (mfg)


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