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A New Thickness Measuring Gauge

A New Thickness Measuring Gauge an inch as the foot is pushed upward. If desired, the entire case may be made of transparent material. When in use the gauge is placed on the area to be inspected, the valve is opened and the air inside the instrument allowed to reach normal atmospheric pressure. A reading is then taken which acts as a An Ingenious Glenn Martin Device that "standard" for the test. With the valve again closed, the air is evacuated and, should there be a faulty bond Operates on the Pressure Principle or no bond between the surface sheet and the adjacent layers, this "loose" sheet area will pull away from the other layers against the foot of the gauge and a deflexion of several thousandths of an inch will be Development of a new-type instrument gauge which edged with a rubber gasket. Mounted inside the shell detected on the dial. opens an entirely new aspect to the measurement of is a dial indicator equipped with a stem reaching to a The instrument may be so calibrated for the mate­ thickness of metal sheet stock has been announced by spherically shaped foot, which, when the instrument is rials being inspected, particularly those of sandwich- The Glenn L. Martin Co. The device also may be used being used, rests against the metal sheet surface. type construction, for the number and thickness of for inspection of the bonds between the laminar layers A valve in the top of the case is connected to an the layers, so that for a particular material a deflexion of laminated materials. exterior pump so that the air inside the gauge can be of certain degrees can be readily interpreted as a Operating on the pressure principle, the gauge withdrawn or the pressure reduced to any desired or faulty bond in a particular layer. consists of an inverted cup-shaped shell with a top predetermined amount. The dial of the gauge is of Owing to the instrument's ability to detect deflexion wall of transparent material and the bottom rim conventional design which measures thousandths of in sheet materials, it can also be calibrated to inspect the thickness of a single-sheet material, particularly with large sheets where measuring central areas would be impossible with micrometers. In measuring thickness of sheet metal, the pressures recorded during the test are checked against pre­ determined gauge readings for each thickness of the metal. Use of the device is not restricted to metals and is equally efficient when testing wood, plastics, glass cloth, woven materials impregnated with plastics or any other which has sufficient structural strength to be used in laminated fabrics. It is particularly valuable in cases where weight or excess material is undesirable as an accurate deter­ mining of the per cent bond so that the maximum strength of the material may be utilized, as in various types of structural work. B.S. SPECIFICATION Copies of the following Specification may be obtained at the price indicated, from the British Standards Institution, 28 Victoria Street, London, S.W.I. B.S. No. 1295.—Tests for Use in the Training of Welders. This Standard has been prepared in an endeavour to unify the general method of assessing the quality of workmanship of a welder during his period of training. It is appreciated that the conditions under which welders are trained in the various schools set up throughout the country naturally vary to a con­ siderable extent. Consequently, there has been a corresponding variation in the methods adopted for assessing workmanship, and the need was felt for test methods which would assist in securing that the work of all welding trainees should be judged by similar means, thus leading to a uniform standard of training in all schools. The tests are not intended to rank as an indication of the capacity of a trainee to conform to the require­ ments of any other British Standard Specification for a particular job where tests of workmanship under special conditions are required, but should only be used as a guide to instructors in assisting them to assess the progress of individual trainees. The Standard lays down the general requirements in regard to types of material, preparatory work, simulation to actual work and testing procedure for a series of tests designed to asses; the quality of work­ manship of a welder during his period of training. Two schedules list the various aspects of welds for which test specimens should bo inspected. There are nine tests covering butt welds in plates and piping, fillet welds in plates and sheets, pipe branch welds and the building-up of surfaces. Appendices deal with a suggested method of preparing etched specimens and give notes for the guidance of instructors. The Standard has been bound in a stiff cover so as to be suitable for frequent reference in a school or workshop. Price, 3s. 6d. AIRFRAME REPAIRS-PAST, PRESENT AND FUTURE I n the article with the above title in the April issue there appeared in the second column on p. 137 the sentence: "The resin bond is mildly thermoplastic and can be broken down by heat". Dr. de Bruyne writes to point out that while this statement is in itself correct it becomes slightly misleading when applied to wooden aircraft as the strength of the bond between the wood and metal is stronger than the wood itself up to temperatures at which the wood begins to scorch. 214 Aircraft Engineering http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Aircraft Engineering and Aerospace Technology Emerald Publishing

A New Thickness Measuring Gauge

Aircraft Engineering and Aerospace Technology , Volume 18 (6): 1 – Jun 1, 1946
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Publisher
Emerald Publishing
Copyright
Copyright © Emerald Group Publishing Limited
ISSN
0002-2667
DOI
10.1108/eb031385
Publisher site
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Abstract

an inch as the foot is pushed upward. If desired, the entire case may be made of transparent material. When in use the gauge is placed on the area to be inspected, the valve is opened and the air inside the instrument allowed to reach normal atmospheric pressure. A reading is then taken which acts as a An Ingenious Glenn Martin Device that "standard" for the test. With the valve again closed, the air is evacuated and, should there be a faulty bond Operates on the Pressure Principle or no bond between the surface sheet and the adjacent layers, this "loose" sheet area will pull away from the other layers against the foot of the gauge and a deflexion of several thousandths of an inch will be Development of a new-type instrument gauge which edged with a rubber gasket. Mounted inside the shell detected on the dial. opens an entirely new aspect to the measurement of is a dial indicator equipped with a stem reaching to a The instrument may be so calibrated for the mate­ thickness of metal sheet stock has been announced by spherically shaped foot, which, when the instrument is rials being inspected, particularly those of sandwich- The Glenn L. Martin Co. The device also may be used being used, rests against the metal sheet surface. type construction, for the number and thickness of for inspection of the bonds between the laminar layers A valve in the top of the case is connected to an the layers, so that for a particular material a deflexion of laminated materials. exterior pump so that the air inside the gauge can be of certain degrees can be readily interpreted as a Operating on the pressure principle, the gauge withdrawn or the pressure reduced to any desired or faulty bond in a particular layer. consists of an inverted cup-shaped shell with a top predetermined amount. The dial of the gauge is of Owing to the instrument's ability to detect deflexion wall of transparent material and the bottom rim conventional design which measures thousandths of in sheet materials, it can also be calibrated to inspect the thickness of a single-sheet material, particularly with large sheets where measuring central areas would be impossible with micrometers. In measuring thickness of sheet metal, the pressures recorded during the test are checked against pre­ determined gauge readings for each thickness of the metal. Use of the device is not restricted to metals and is equally efficient when testing wood, plastics, glass cloth, woven materials impregnated with plastics or any other which has sufficient structural strength to be used in laminated fabrics. It is particularly valuable in cases where weight or excess material is undesirable as an accurate deter­ mining of the per cent bond so that the maximum strength of the material may be utilized, as in various types of structural work. B.S. SPECIFICATION Copies of the following Specification may be obtained at the price indicated, from the British Standards Institution, 28 Victoria Street, London, S.W.I. B.S. No. 1295.—Tests for Use in the Training of Welders. This Standard has been prepared in an endeavour to unify the general method of assessing the quality of workmanship of a welder during his period of training. It is appreciated that the conditions under which welders are trained in the various schools set up throughout the country naturally vary to a con­ siderable extent. Consequently, there has been a corresponding variation in the methods adopted for assessing workmanship, and the need was felt for test methods which would assist in securing that the work of all welding trainees should be judged by similar means, thus leading to a uniform standard of training in all schools. The tests are not intended to rank as an indication of the capacity of a trainee to conform to the require­ ments of any other British Standard Specification for a particular job where tests of workmanship under special conditions are required, but should only be used as a guide to instructors in assisting them to assess the progress of individual trainees. The Standard lays down the general requirements in regard to types of material, preparatory work, simulation to actual work and testing procedure for a series of tests designed to asses; the quality of work­ manship of a welder during his period of training. Two schedules list the various aspects of welds for which test specimens should bo inspected. There are nine tests covering butt welds in plates and piping, fillet welds in plates and sheets, pipe branch welds and the building-up of surfaces. Appendices deal with a suggested method of preparing etched specimens and give notes for the guidance of instructors. The Standard has been bound in a stiff cover so as to be suitable for frequent reference in a school or workshop. Price, 3s. 6d. AIRFRAME REPAIRS-PAST, PRESENT AND FUTURE I n the article with the above title in the April issue there appeared in the second column on p. 137 the sentence: "The resin bond is mildly thermoplastic and can be broken down by heat". Dr. de Bruyne writes to point out that while this statement is in itself correct it becomes slightly misleading when applied to wooden aircraft as the strength of the bond between the wood and metal is stronger than the wood itself up to temperatures at which the wood begins to scorch. 214 Aircraft Engineering

Journal

Aircraft Engineering and Aerospace Technology – Emerald Publishing

Published: Jun 1, 1946

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