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Frictionless Positioning Device

IP.com Disclosure Number: IPCOM000082900D
Original Publication Date: 1975-Feb-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Griffiths, EH: AUTHOR

Abstract

Accurate positioning of a component having a machined bore is provided by supporting the component on air pads to allow frictionless lateral movement, whilst an expandable split collet enters the bore. When the collet is expanded by movement of a central expander rod, the component is positioned with respect to the rod which is a datum.

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Frictionless Positioning Device

Accurate positioning of a component having a machined bore is provided by supporting the component on air pads to allow frictionless lateral movement, whilst an expandable split collet enters the bore. When the collet is expanded by movement of a central expander rod, the component is positioned with respect to the rod which is a datum.

The component, which may be a casting must have an accurately machined circular bore as the device engages the bore to effect positioning. Initially, the component is inserted in the device on two rails which are then moved down to allow the component to be supported in approximately the required position on three or more air pads, which are located below corresponding flat surfaces on the component. The air pad supports are circular surfaces, raised from the surface of the table, each having a central jet supplied with compressed air. The air jets float the component about 0.05 mm above the circular surfaces, enabling almost friction-less lateral movement of the component.

Next, a split collet is moved upward to the position shown in the drawing. An expander rod having a tapered end engages an internal taper on the split collet. The upper end of the split collet is supported by a thin wall and is held in a closed position by a circular spring around the wall. When the expander rod is moved upward, the split collet expands to centralize the bore in the component, the air supports allowing lateral mo...