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In this example we are dispensing on a blank carbon plate to illustrate the benefits of standoff foot dispensing. The paths are programmed as XYZ coordinates and then at the moment of dispense, these are instantly converted to Y, Z, and theta coordinates to keep the standoff foot to the inside of any given polygon. The result is that at no time does the foot cross over the gasket and the gasket height is 0.020" or 0.5mm tall. Because we maintain full axis control, when we lead out at the end of the gasket, we can spiral inwards to prevent the "Hershey kiss" effect when pulling away from the main body of the gasket.
Also note that the gasket would maintain its precise height despite any part warpage up to +/- 0.5" or 12.27mm. The compliant foot rides on a linear bearing with a total of one inch of stroke.
Not all applications are ideal for a compliant foot configuration. The foot itself has the potential to abrade the substrate on which it is riding. In most cases this is not objectionable as the down force of the foot can be controlled to minimize damage or the fixed sliding point can be replaced with a radial bearing or wheel. In those cases where any abrasion may lead to unacceptable surface damage, we would encourage you to consider our height measurement sensing system, CPOTHS.
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