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Optical Projector Speeds Inspection

Optical Projector Speeds Inspection AIRCRAFT electronic and systems manufacturer Racal Avionics Ltd, New Maiden, is using a new 'Shadomaster' optical projector Optical Projector Speeds from Baty & Co for exacting quality control checks. Installed in November last year, Inspection the new 2M20XL 20-inch screen projector replaced two earlier Baty models. A considerable space saving has resulted, and in addition, the new equipment has a number of useful extra features. 'Inch/metric digital readouts (DRO's) for the X 'The third significant benefit of it it is parallel, tapping each end of and Y axis movements of the the optical projector compared with the part successively to halve the workstage are easier to read than the CMM', continues Mr Harvey, 'is error each time'. micrometer scales, can be zeroed at that parts are much easier to line up A disadvantage with optical the touch of a button, and may be parallel with the measurement axis. projectors has always been that they preset , to speed batch The Shadomaster workstage platen are basically for two-dimensional measurement' , says Mr Peter measuring. However recent rotate s through 360 degrees to Harvey, chief inspector of Racal improvements in illumination, light facilitate alignment with the Avionics' quality control collimation, iris diaphragm measuring axis or screen datums, department. 'Moreover the new adjustment, and focusing, combined whereas with our CMM, you have to model has an optical digital with the use of episcopic projection, align the part roughly on the table by protracto r with clear scales to enables 3D features to be measured. eye, then repeatedly measure to see facilitate angle measurements to an Racal Avionics frequently use this accuracy of 1 minute of arc' (An facility to measure the depth of holes electronic DRO protractor is also by focusing first on the top surface, available for angle measurements, if then on the bottom, and noting required). workstage focus travel. Episcopic projection is also useful for Of the thousands of components measuring and inspecting surface which pass through Racal Avionics' features. QC department, about 90 percent of which are bought in, some 10 A lens turret to speed the change percent are measured and/or between one magnification and inspected on the Shadomaster, another up to x 100 is available from resolution being 0,002 mm/0.0001 Baty, although Racal Avionics use inch. Useable surface area of the just one x 10 lens. Another feature workstage is 12 inchesx6 inches, on the 'XL' model which they are and co-ordinate movements are 6 not currently using is the RS232 inches x 2 inches. To date, the interface for connecting with hard mechanical and electrical parts put copy printers, or computers for on Racal's optical projector range statistical analysis. from 53 gauge coil wire to 6 inch square printed circuit boards. Baty & Co Ltd Larger components are checked on Victoria Road a co-ordinate measuring machine Burgess Hill (CMM). The company has its own West Sussex RH15 9LB AQ L sampling system based on Ministry of Defence requirements but varied to take account of the small volumes inspected, and any special requirements introduced by unusual production situations. 'Comparing optical projection with co-ordinate measuring machine methods, we have found that the former has three particular benefits', advises Mr Harvey. 'First, it is simpler to use, especially with the DRO's, allowing operation by less skilled personnel. Furthermore it is a non-contact measurement system, which makes operation safer for the components under test. AIRCRAFT ENGINEERING - August 1985 19 http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Aircraft Engineering and Aerospace Technology Emerald Publishing

Optical Projector Speeds Inspection

Aircraft Engineering and Aerospace Technology , Volume 57 (8): 1 – Aug 1, 1985

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Publisher
Emerald Publishing
Copyright
Copyright © Emerald Group Publishing Limited
ISSN
0002-2667
DOI
10.1108/eb036147
Publisher site
See Article on Publisher Site

Abstract

AIRCRAFT electronic and systems manufacturer Racal Avionics Ltd, New Maiden, is using a new 'Shadomaster' optical projector Optical Projector Speeds from Baty & Co for exacting quality control checks. Installed in November last year, Inspection the new 2M20XL 20-inch screen projector replaced two earlier Baty models. A considerable space saving has resulted, and in addition, the new equipment has a number of useful extra features. 'Inch/metric digital readouts (DRO's) for the X 'The third significant benefit of it it is parallel, tapping each end of and Y axis movements of the the optical projector compared with the part successively to halve the workstage are easier to read than the CMM', continues Mr Harvey, 'is error each time'. micrometer scales, can be zeroed at that parts are much easier to line up A disadvantage with optical the touch of a button, and may be parallel with the measurement axis. projectors has always been that they preset , to speed batch The Shadomaster workstage platen are basically for two-dimensional measurement' , says Mr Peter measuring. However recent rotate s through 360 degrees to Harvey, chief inspector of Racal improvements in illumination, light facilitate alignment with the Avionics' quality control collimation, iris diaphragm measuring axis or screen datums, department. 'Moreover the new adjustment, and focusing, combined whereas with our CMM, you have to model has an optical digital with the use of episcopic projection, align the part roughly on the table by protracto r with clear scales to enables 3D features to be measured. eye, then repeatedly measure to see facilitate angle measurements to an Racal Avionics frequently use this accuracy of 1 minute of arc' (An facility to measure the depth of holes electronic DRO protractor is also by focusing first on the top surface, available for angle measurements, if then on the bottom, and noting required). workstage focus travel. Episcopic projection is also useful for Of the thousands of components measuring and inspecting surface which pass through Racal Avionics' features. QC department, about 90 percent of which are bought in, some 10 A lens turret to speed the change percent are measured and/or between one magnification and inspected on the Shadomaster, another up to x 100 is available from resolution being 0,002 mm/0.0001 Baty, although Racal Avionics use inch. Useable surface area of the just one x 10 lens. Another feature workstage is 12 inchesx6 inches, on the 'XL' model which they are and co-ordinate movements are 6 not currently using is the RS232 inches x 2 inches. To date, the interface for connecting with hard mechanical and electrical parts put copy printers, or computers for on Racal's optical projector range statistical analysis. from 53 gauge coil wire to 6 inch square printed circuit boards. Baty & Co Ltd Larger components are checked on Victoria Road a co-ordinate measuring machine Burgess Hill (CMM). The company has its own West Sussex RH15 9LB AQ L sampling system based on Ministry of Defence requirements but varied to take account of the small volumes inspected, and any special requirements introduced by unusual production situations. 'Comparing optical projection with co-ordinate measuring machine methods, we have found that the former has three particular benefits', advises Mr Harvey. 'First, it is simpler to use, especially with the DRO's, allowing operation by less skilled personnel. Furthermore it is a non-contact measurement system, which makes operation safer for the components under test. AIRCRAFT ENGINEERING - August 1985 19

Journal

Aircraft Engineering and Aerospace TechnologyEmerald Publishing

Published: Aug 1, 1985

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