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Browse Prior Art Database

Testing Material Flatness with Inductive Sensors

IP.com Disclosure Number: IPCOM000105125D
Original Publication Date: 1993-Jun-01
Included in the Prior Art Database: 2005-Mar-19
Document File: 4 page(s) / 58K

Publishing Venue

IBM

Related People

McKnight, TJ: AUTHOR [+3]

Abstract

Disclosed is a device that measures flatness of metal pallets by sensing the distance of critical points on the pallet to inductive sensors. The design used for IBM Austin's work board holders consists of a flat plate mounted on a support at a fifteen degree angle. The fifteen degree angle of the plate is an ERGONOMIC feature for operator comfort. Mounted within and flush to the plate are nine inductive sensors; Keyence part number EH308. Each sensor has a controller; Keyence part number ES32DC. The sensors are mounted to correspond to the four corners, top middle, bottom middle, left side middle and right side middle of the work board holder. The ninth sensor is mounted inboard of the upper left corner. The eight sensors are adjusted to detect alumi- num within .

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Testing Material Flatness with Inductive Sensors

      Disclosed is a device that measures flatness of metal pallets
by sensing the distance of critical points on the pallet to inductive
sensors.  The design used for IBM Austin's work board holders
consists of a flat plate mounted on a support at a fifteen degree
angle.  The fifteen degree angle of the plate is an ERGONOMIC feature
for operator comfort.  Mounted within and flush to the plate are nine
inductive sensors; Keyence part number EH308.  Each sensor has a
controller; Keyence part number ES32DC.  The sensors are mounted to
correspond to the four corners, top middle, bottom middle, left side
middle and right side middle of the work board holder.  The ninth
sensor is mounted inboard of the upper left corner.  The eight
sensors are adjusted to detect alumi- num within .025" to check
flatness and the ninth sensor is adjusted to detect aluminum within
.060" to start the test routine (Fig. 1).  The software is ladder
logic and is stored in a General Electric Series One programmable
logic controller (Fig. 2).

      When a work board holder is tested, it is placed on the device
upside down.  If the work board holder is not flat within .025"; has
bent clips; has missing locating pins or a locating pin is too high;
the inductive sensors will not detect the aluminum and the "fail"
light will illuminate if all conditions are correct, the "ok" light
will illumi- nate.  After testing, two lifters raise the work...