Browse Prior Art Database

Air-Bearing Table

IP.com Disclosure Number: IPCOM000046522D
Original Publication Date: 1983-Aug-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Rigbey, LJ: AUTHOR

Abstract

An air-bearing table used in conjunction with a robotic assembly arm provides compliance required during precision assembly of one part supported on the table with another part carried by the arm, where clearance between the parts is less than the positional repeatability of the apparatus. The table 1, shown in the figure, is supported on a rigid base plate 2 by four air bearings 3, located one at each corner. Two cylindrical posts 4 extend vertically from the base plate 2 into clearance holes 5 in the table and act as limit stops for lateral movement of the table. Four low-rate compression springs 6 (only one shown) supported in symmetrically positioned longitudinal holes 7 in the table 1, bear on the two posts 4 (two springs on each post).

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Air-Bearing Table

An air-bearing table used in conjunction with a robotic assembly arm provides compliance required during precision assembly of one part supported on the table with another part carried by the arm, where clearance between the parts is less than the positional repeatability of the apparatus. The table 1, shown in the figure, is supported on a rigid base plate 2 by four air bearings 3, located one at each corner. Two cylindrical posts 4 extend vertically from the base plate 2 into clearance holes 5 in the table and act as limit stops for lateral movement of the table. Four low-rate compression springs 6 (only one shown) supported in symmetrically positioned longitudinal holes 7 in the table 1, bear on the two posts 4 (two springs on each post). The springs are held in place by screws 8 which are adjustable to provide pre-load centering forces to balance and center the table with constant clearance around the two posts 4. The table is designed to provide a large vertical stiffness (more than 100,000 pounds/inch for a flying height of approximately 0.0015") with low resistance to lateral movement (5 pounds/inch) within the limits defined by the stops. A typical assembly job, for which the table is particularly suited, is the insertion of one component vertically into a close-fit hole of another component supported on the table. As one component is offered to the other in a vertical direction, the low lateral resistance to movement permits the table t...