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Aluminum gears with bonded-in steel hubs
270
CURRENT TOPICS
[J. F. I.
Aluminum Gears with Bonded-in Steel Hubs.--A new gear made of aluminum, with a bonded-in steel hub, has been developed by the A1-Fin Division, Farmingdale, L. I., of the Fairchild Engine and Airplane Corporation, according to M. V. Little, Acting General Manager of the Division. Lighter, and stronger than molded resin and fiber gears, the A1-Fin bonded gear can stand heavier loads. Perfected after two years of research and testing, the gears, which are hobbed and shaved, are as quiet in operation as the composition type. Made of aluminum alloy, bonded to steel with a molecular process originally developed by M-Fin, the gears have a tensile strength of about 15,000 psi. With steel hubs there is no danger of the aluminum gear conforming to the shaft. The gear has withstood shear tests of the bond up to 98,000 lb. Aluminum alloys are used for strength and heat treatment of the casting and develop a Brinell hardness of 85 to 120, depending upon requirements. The patented A1-Fin process of molecularly bonding aluminum and its alloys to steel and iron is a development which permits the fabrication of bi-metallic assemblies combining selected physical properties of both metals and facilitates the production of units requiring the strength, hardness, resilience, and fatigue resistance of steel with the light weight, high heat conductivity, excellent bearing properties, anticorrosive qualities, and other characteristics of aluminum. Magnetic Particle Clutch.--The first commercially-usable magnetic-particle clutches have been introduced by the Vickers Electric Division of St. Louis, Mo., with its new line of Magneclutches and Magnebrakes. First developed for use by the Navy for more efficient operation of shipboard equipment such as radar, sonar, fire control and other devices, Vickers Magneclutches and Magnebrakes are now in production for use by industry for control of torque, speed and position. The Vickers Magneclutch is a controllable coupling which utilizes the linking action of a dry magnetic mixture in a magnetic field between driving and driven parts to transmit torque. The magnetic mixture is composed of iron particles and flake graphite. The magnetic field is established by current flowing through a coil, and by varying the current the degree of clutching can be controlled. Design and operating advantages offered by the new Vickers clutch that indicate widespread usage throughout industry include: small control power with extremely fast response, no wear on torque transmitting surfaces, torque at zero slip, large maximum to minimum torque ratio and easy adaptation to remote control. Cancer Treatment Advanced by Radar Research.--Development of the first 4,000,000 electron volts linear acceleration high voltage equipment for cancer treatment and nuclear physics research was announced by Philips Industries during the International Radiological Congress held in London, July 24th to 30th. The equipment, developed by radar scientists, produces ultra-high penetrating X-rays and has a rating of plus or minus 250 Roentgens per minute at 40 in. distance. The first unit is now in operation in England with more units to be available by the end of the year. The new equipment is surprisingly compact, provides great flexibility in operation and is more economical than any equipment heretofore considered. The tube is accommodated on a Gantry type
CURRENT TOPICS
[J. F. I.
Aluminum Gears with Bonded-in Steel Hubs.--A new gear made of aluminum, with a bonded-in steel hub, has been developed by the A1-Fin Division, Farmingdale, L. I., of the Fairchild Engine and Airplane Corporation, according to M. V. Little, Acting General Manager of the Division. Lighter, and stronger than molded resin and fiber gears, the A1-Fin bonded gear can stand heavier loads. Perfected after two years of research and testing, the gears, which are hobbed and shaved, are as quiet in operation as the composition type. Made of aluminum alloy, bonded to steel with a molecular process originally developed by M-Fin, the gears have a tensile strength of about 15,000 psi. With steel hubs there is no danger of the aluminum gear conforming to the shaft. The gear has withstood shear tests of the bond up to 98,000 lb. Aluminum alloys are used for strength and heat treatment of the casting and develop a Brinell hardness of 85 to 120, depending upon requirements. The patented A1-Fin process of molecularly bonding aluminum and its alloys to steel and iron is a development which permits the fabrication of bi-metallic assemblies combining selected physical properties of both metals and facilitates the production of units requiring the strength, hardness, resilience, and fatigue resistance of steel with the light weight, high heat conductivity, excellent bearing properties, anticorrosive qualities, and other characteristics of aluminum. Magnetic Particle Clutch.--The first commercially-usable magnetic-particle clutches have been introduced by the Vickers Electric Division of St. Louis, Mo., with its new line of Magneclutches and Magnebrakes. First developed for use by the Navy for more efficient operation of shipboard equipment such as radar, sonar, fire control and other devices, Vickers Magneclutches and Magnebrakes are now in production for use by industry for control of torque, speed and position. The Vickers Magneclutch is a controllable coupling which utilizes the linking action of a dry magnetic mixture in a magnetic field between driving and driven parts to transmit torque. The magnetic mixture is composed of iron particles and flake graphite. The magnetic field is established by current flowing through a coil, and by varying the current the degree of clutching can be controlled. Design and operating advantages offered by the new Vickers clutch that indicate widespread usage throughout industry include: small control power with extremely fast response, no wear on torque transmitting surfaces, torque at zero slip, large maximum to minimum torque ratio and easy adaptation to remote control. Cancer Treatment Advanced by Radar Research.--Development of the first 4,000,000 electron volts linear acceleration high voltage equipment for cancer treatment and nuclear physics research was announced by Philips Industries during the International Radiological Congress held in London, July 24th to 30th. The equipment, developed by radar scientists, produces ultra-high penetrating X-rays and has a rating of plus or minus 250 Roentgens per minute at 40 in. distance. The first unit is now in operation in England with more units to be available by the end of the year. The new equipment is surprisingly compact, provides great flexibility in operation and is more economical than any equipment heretofore considered. The tube is accommodated on a Gantry type