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Automatic PLATE Alignment and Orthogonality Test

IP.com Disclosure Number: IPCOM000043904D
Original Publication Date: 1984-Oct-01
Included in the Prior Art Database: 2005-Feb-05
Document File: 3 page(s) / 47K

Publishing Venue

IBM

Related People

Reis, JW: AUTHOR [+2]

Abstract

This article describes an automatic plate aligning and orthogonality test to determine if a machine can meet certain squareness specifications. The test is run by a program which replaces the manual test of plate alignment and machine orthogonality. The aligning of a five-pin plate fixture, as illustrated in Fig. 1, by dial indicator of a performance measurement device is a procedure that is time consuming and prone to human error. The adjustment of the dial indicator for each pin and the remembering of the dial indicator readings is often tedious and inclined to error. Current methods require approximately 10 to 30 minutes to align a plate to the workspace. A manual orthogonality test requires a minimum of 25 minutes to run.

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Automatic PLATE Alignment and Orthogonality Test

This article describes an automatic plate aligning and orthogonality test to determine if a machine can meet certain squareness specifications. The test is run by a program which replaces the manual test of plate alignment and machine orthogonality. The aligning of a five-pin plate fixture, as illustrated in Fig. 1, by dial indicator of a performance measurement device is a procedure that is time consuming and prone to human error. The adjustment of the dial indicator for each pin and the remembering of the dial indicator readings is often tedious and inclined to error. Current methods require approximately 10 to 30 minutes to align a plate to the workspace. A manual orthogonality test requires a minimum of 25 minutes to run. A program that tells the technician how to align the plate and by how much, and also proceeds through the correct aligning steps, can cut setup time by one-half and eliminate error completely. Program control at the plate and not at the terminal speeds up the aligning procedure and eliminates wasteful steps. The setup program described herein does the above. The setup program runs off a robotic system operator controller (pendant). Control of the program is provided by pressing the pendant key which will then initiate the corresponding program to startup. The program displays menu options and instructions by use of the light-emitting diodes (LEDs) in the pendant. The menu options work by displaying the option and at the same time lighting the pendant key for that option. The program stays in a revolving loop until one of the menu option keys is pressed. Fig. 3 is a diagram of the revolving lighted display menu which illustrates the assignment of the routines to the pendant lighted keys. The diagrams are also displayed during the test on the terminal. The "o" denotes the light itself. Fig. 4 is a flow chart illustrating the test sequence including subroutines A and B. This may be expanded into applications utilizing the sensors, contact or non-contact to orient fixtures, loaders, etc., by way of a calibration of points within each item via the pendant, thus allowing flexibility in setup without "hard" locating points. Referring to Fig. 3, the pendant key PLATE SQU will start the plate alignment routine. The calibration of the base point must be completed first or an error message will print out. The routine will start out by going to the calibration point, shown in the diagram on the next page, and recording the linear voltage differential transducers (LVDTs). The arm will then move to the pin opposite to it along the Y axis. The arm carrying the LVDTs, as shown in the performance measurement device of Fig. 2, will then sit on the pin and display the current X LVDT reading. The operator can then move the plate while reading the LVDT display until the LVDT reading reads 0 mils. Pressing any lighted button at this time will end the routine and move the...