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Aluminium ColdI/ARIOUS cup-shaped parts working Processes v with cold-forged bottoms, Save Machining. combined with extruded side walls, are being made in one operation from aluminium slugs. Others that would normally require two or more expensive machining operations can be made by two simple methods of impact extrusion and trimming. The cold-working process produces parts strong and rigid enough for many purposes. Most of the material used is commercially pure aluminium under pressures up to 200,000 lb. per sq. in., depending upon the initial hardness of the slug, the bottom area and the thickness of the side walls.
Pleasant Function nNE of the most pleasant Before Fluorescent v—ifunctions that we have Lighting Show. . . attended lately was the lunchCon to the Press given by Mr. E. L. Cadwallader, Mins:LT., director and general manager of C.A.V., Ltd., who was supported by Mr. Cecil Hughes, sales manager, of Siemens Electric Lamps and Supplies, Ltd., and Mr. A. T. Priddle, the C.A.V. chief development engineer, the occasion being a demonstration of the new C.A.V. systems Of fluorescent lighting for ps. vehicles. Mr. Cadwallader paid some nice compliments to the trade and technical Press regarding its accuracy, fair treatment and well-balanced views. The Editor of this journal responded, followed by several other members of the Press, and appreciation was expressed at the way in which C.A.V., Ltd., had maintained its relationship with the various journals during the worst periods of the recent war, N interesting method of r-/'rnaking steel tubing is employed by the Bundy concern of Detroit, America. A tong, single strip of copper-coated steel is rolled twice round, laterally, into tubular form, making a double wall of uniform thickness throughout The formed strip then passes through a brazing furnace, where the copper coating fuses and bonds the walls and joint. There is no scale, and the complete coppering assists in the prevention of corrosion. To finish, the tube ends are cut with a specially designed tool which removes inside and outside burrs in one operation so that fittings can be assembled and soldered or the tube ends flared This tubing can also be made in monel. metal.
Double-wall Tubing Made from Coppered Steel Strip .
Oiling System PreA WELL-KNOWN American vents Shafts Touching " machine-tool maker has Bearings recently taken out a British patent covering a design for a bearing and lubrication, in which provision is made for permanently floating a spindle in its bearing by oil which is at such a pressure as to balance the spindle weight. The bearing is lubricated from every place around its circumference through slots extending for most of its whole length. The spaces between these, which form the bearing area, are of such a width that the oil from one slot meeting that from the others at each side retains the desired pressure if the shaft tends to approach one side of the bearing, pressure at that side is automatically increased, because 'the various sections of bearing areas are independent of each other so far as the oil flow is concerned,
British Buses Much ('NE of our technical friends Quieter Than Many who has recently been American travelling in the U.S. was sur .
prised to observe that the buses were, as a rule, far more noisy than would be appre
ciated by passengers in Britain. One would have thought that the ultra-modern design of many of these vehicles would be accompanied by a corresponding improvement in this respect, but traffic noise does not seem to have worried Americans in the past, the -overhead railway in New York being one example of this.
Vitamin Pills for 1/1ANY employers of labour Workers Most Liable now provide vitamin cap to, Colds sides of various sorts especially for those workers who have to venture out in all weathers. In some cases they are sold cheaply to the employees. Amongst such thoughtful employers is Mr. G. Rock, manager of the the Lincoln Corporation Transport Department, who recently purchased 30,000 of such "pills." He introduced the scheme last year and it proved most successful. In this instance they are sold to bus drivers and conductresses