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FURTHER NOTES ON GREASE BLEEDING

FURTHER NOTES ON GREASE BLEEDING "To perform the test, the grease cup (having been FURTHER NOTES ON cleaned and dried) shall be placed, cup uppermost, in the outer casing, and the cup and casing shall be GREASE BLEEDING weighed together. The cup shall be filled to excess with the grease to be tested; the excess grease shall W E ARE INDEBTED to Mr. J. K. Vose of be cleaned off level with the lip of the outer casing and Metropolitan-Vickers Electrical Co. Ltd., (Motor the whole weighed again, whence the weight of grease Engineering Department), for the identification of may be found. The levelled surface of the grease the early oil-release method mentioned in the paper shall be covered with the previously prepared oiled 'Grease Bleeding' by E. G. Ellis in our September disc of filter paper and the now completely prepared issue. This method actually appeared in the first apparatus shall be inverted and placed on a weighed revision of the Company's Purchasing Specification pad of four Whatman's No. 42 filter papers for a for Grease of October, 1935, and the relevant clause period of two hours. At the end of this period, the read as follows :— pad of four filter paper shall be replaced by a second "The grease shall be treated at a temperature of similar weighed pad, and the test shall be continued 20°C. (68°F.) in the manner described in Appendix 1 for a further period of two hours, after which the to this specification. The oil released from the grease second pad shall be replaced by a third similar weighed pad and the test concluded after another in this test shall be between 5 and 10% of the original period of two hours. The three pads shall be re- weight of the grease and shall preferably be nearer weighed and from a knowledge of the original weights of the pads and that of the grease, the total weight of oil released by the grease shall be expressed as a percentage of the original weight of the grease. "In making this calculation a correlation may be made, should conditions render it desirable, for the amount of water absorbed by the pads of filter paper. This may be effected in the conventional way, by exposing to the atmosphere for the period of the test, blank pads of four filter papers". Mr. Vose also kindly brought to our attention, details of special grease testing equipment designed and used by Metropolitan-Vickers Ltd. as part of a development programme* ; a rig which simulated the operating conditions of the range of medium sized motors and generators made by this company. Two grease-filled test bearings are used, a 3-in. ball bearing on the non-driving end of the horizontal shaft and a roller bearing at the driven end. The loading bearing assembly located in the centre of the shaft has oil-lubricated roller bearings, the oil being circulated under pressure and water cooled. A wide range of speed, up to 3,000 r.p.m. is available while loads up to 2,500 lb. per bearing can be applied. Also, heaters and regulators allow considerable variation from ambient temperature conditions. During the tests described the rigs were normally run for 100 hours per week and shut down during the week-ends to permit cooling down. They were also stopped for 15 min. each day when small samples of grease were removed from the region of the cage and inspected for signs of incipient cage wear. The the upper limit. Oil release shall be measured by tests were continued until cage wear was confirmed on means of the apparatus shown in the drawing. The both grease lubricated bearings. method involves the provision of an oil-soaked disc of filter paper which shall be prepared as follows. * Webber, D. C. and Vose, J. K. Metropolitan-Vickers A ⅞ in. dia. disc of Whatman's No. 42 filter paper Gazette. Dec., 1956. shall be set on a piece of glass, or other suitable base material, and shall be wetted with two drops of oil of CALIFORNIA RESEARCH CRPN. NEW ENGINE LAB. the type used in the grease under examination. I N our October issue (page 29) we gave details of the After the oil has spread over the surface of the disc of above laboratory under our heading "Current paper, the disc shall be placed on a sheet of Whatman's No. 42 filter paper, on which it shall remain for one Literature". The authors of this paper were given, in hour for the purpose of removing excess of oil from error, as members of the Shell Development Company. the disc. The disc will then be ready for use in They should have been Moore, Vernon and Bert, of carrying out the oil-release test. the California Research Corporation. Scientific LUBRICATION December, 1958 http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Industrial Lubrication and Tribology Emerald Publishing

FURTHER NOTES ON GREASE BLEEDING

Industrial Lubrication and Tribology , Volume 10 (12): 1 – Dec 1, 1958

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Publisher
Emerald Publishing
Copyright
Copyright © Emerald Group Publishing Limited
ISSN
0036-8792
DOI
10.1108/eb052546
Publisher site
See Article on Publisher Site

Abstract

"To perform the test, the grease cup (having been FURTHER NOTES ON cleaned and dried) shall be placed, cup uppermost, in the outer casing, and the cup and casing shall be GREASE BLEEDING weighed together. The cup shall be filled to excess with the grease to be tested; the excess grease shall W E ARE INDEBTED to Mr. J. K. Vose of be cleaned off level with the lip of the outer casing and Metropolitan-Vickers Electrical Co. Ltd., (Motor the whole weighed again, whence the weight of grease Engineering Department), for the identification of may be found. The levelled surface of the grease the early oil-release method mentioned in the paper shall be covered with the previously prepared oiled 'Grease Bleeding' by E. G. Ellis in our September disc of filter paper and the now completely prepared issue. This method actually appeared in the first apparatus shall be inverted and placed on a weighed revision of the Company's Purchasing Specification pad of four Whatman's No. 42 filter papers for a for Grease of October, 1935, and the relevant clause period of two hours. At the end of this period, the read as follows :— pad of four filter paper shall be replaced by a second "The grease shall be treated at a temperature of similar weighed pad, and the test shall be continued 20°C. (68°F.) in the manner described in Appendix 1 for a further period of two hours, after which the to this specification. The oil released from the grease second pad shall be replaced by a third similar weighed pad and the test concluded after another in this test shall be between 5 and 10% of the original period of two hours. The three pads shall be re- weight of the grease and shall preferably be nearer weighed and from a knowledge of the original weights of the pads and that of the grease, the total weight of oil released by the grease shall be expressed as a percentage of the original weight of the grease. "In making this calculation a correlation may be made, should conditions render it desirable, for the amount of water absorbed by the pads of filter paper. This may be effected in the conventional way, by exposing to the atmosphere for the period of the test, blank pads of four filter papers". Mr. Vose also kindly brought to our attention, details of special grease testing equipment designed and used by Metropolitan-Vickers Ltd. as part of a development programme* ; a rig which simulated the operating conditions of the range of medium sized motors and generators made by this company. Two grease-filled test bearings are used, a 3-in. ball bearing on the non-driving end of the horizontal shaft and a roller bearing at the driven end. The loading bearing assembly located in the centre of the shaft has oil-lubricated roller bearings, the oil being circulated under pressure and water cooled. A wide range of speed, up to 3,000 r.p.m. is available while loads up to 2,500 lb. per bearing can be applied. Also, heaters and regulators allow considerable variation from ambient temperature conditions. During the tests described the rigs were normally run for 100 hours per week and shut down during the week-ends to permit cooling down. They were also stopped for 15 min. each day when small samples of grease were removed from the region of the cage and inspected for signs of incipient cage wear. The the upper limit. Oil release shall be measured by tests were continued until cage wear was confirmed on means of the apparatus shown in the drawing. The both grease lubricated bearings. method involves the provision of an oil-soaked disc of filter paper which shall be prepared as follows. * Webber, D. C. and Vose, J. K. Metropolitan-Vickers A ⅞ in. dia. disc of Whatman's No. 42 filter paper Gazette. Dec., 1956. shall be set on a piece of glass, or other suitable base material, and shall be wetted with two drops of oil of CALIFORNIA RESEARCH CRPN. NEW ENGINE LAB. the type used in the grease under examination. I N our October issue (page 29) we gave details of the After the oil has spread over the surface of the disc of above laboratory under our heading "Current paper, the disc shall be placed on a sheet of Whatman's No. 42 filter paper, on which it shall remain for one Literature". The authors of this paper were given, in hour for the purpose of removing excess of oil from error, as members of the Shell Development Company. the disc. The disc will then be ready for use in They should have been Moore, Vernon and Bert, of carrying out the oil-release test. the California Research Corporation. Scientific LUBRICATION December, 1958

Journal

Industrial Lubrication and TribologyEmerald Publishing

Published: Dec 1, 1958

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