Browse Prior Art Database

Board Flotation Device for Matrix Drilling

IP.com Disclosure Number: IPCOM000101100D
Original Publication Date: 1990-Jun-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 2 page(s) / 51K

Publishing Venue

IBM

Related People

Carter, D: AUTHOR [+3]

Abstract

Disclosed is a device that is used in a matrix drilling machine to slightly float a large panel during a precise X-Y motion to prevent any type of drag on the stationary urethane anvil buttons.

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Board Flotation Device for Matrix Drilling

       Disclosed is a device that is used in a matrix drilling
machine to slightly float a large panel during a precise X-Y motion
to prevent any type of drag on the stationary urethane anvil buttons.

      In matrix drilling, the vacuum buttons 1 are all ground flat to
act as the upper reference surface.  The hydraulically driven anvil
plate 2 and anvil buttons 3 move vertically upwards to clamp the
board with about 27 pounds of force at each drill site.  The anvil
buttons are made from urethane to act as a shock absorber when
actuated vertically upwards against the bottom surface of the panel.
They also are pliable to accommodate the 10 percent variation of
board thickness.

      Since the panel may droop from the lower surfaces of the panel
rails 8 and rest on the rubber-like anvil buttons, it is likely that
frictional forces will detract from the overall accuracy of the X-Y
table, that is positioning the panel relative to the stationary (in X
and Y) anvil buttons.

      Floating the panel is accomplished with pressurized air on the
anvil buttons.  The air supply 4 is manifolded into the anvil plates.
The air then passes through an orifice washer 5, then through a hole
in the anvil button 6, then the air cushion (the small force that is
developed directly above the top surface of the button) floats the
panel when down and unclamped, when a X-Y motion occurs.