Looking back in time 50 Years Ago In MACHINE DESIGN, November 1955

Nov. 17, 2005
Midget servomotor developed for aircraft: A two-phase servomotor developed by General Electric is believed to be the smallest currently used on aircraft.

Midget servomotor developed for aircraft: A two-phase servomotor developed by General Electric is believed to be the smallest currently used on aircraft. Originally developed for use in a gyrocompass unit, it may be adaptable to other uses, say GE engineers. The motor weighs 1.2 oz, measures 1.2 in. long, and has a diameter of 0.625 in. It is rated at 26 V with a no-load speed of 21,000 rpm. The motor is designed to withstand 55 to 90°F temperatures and is said to operate at altitudes up to 60,000 ft.

Chrome coat hardens steel: Heat, wear, and corrosion resistance of ferrous metals are increased by high-temperature diffusion of chromium onto the surface. Called "Chromallizing," the process is reported to be well known in Europe and is coming into use in this country.

According to Chromalloy Corp., the process diffuses chromium into the base metal to form an alloy layer that doesn't spall, peel, or flake.

The process can develop a ductile coating (0.001 to 0.003 in.) of chromium on lowcarbon steel. On medium to highcarbon content steels, a thin (0.0002 to 0.0010 in.) extremely hard (Vickers 1800) chromium carbide layer is formed.

The technique may let lowcarbon steels be used in applications that usually require a Type 400 Series stainless steel.

Reported successful uses of the process include electric strip heaters, turbine liners, and various aircraft components.

Sponsored Recommendations

How BASF turns data into savings

May 7, 2024
BASF continuously monitors the health of 63 substation assets — with Schneider’s Service Bureau and EcoStruxure™ Asset Advisor. ►Learn More: https://www.schn...

Agile design thinking: A key to operation-level digital transformation acceleration

May 7, 2024
Digital transformation, aided by agile design thinking, can reduce obstacles to change. Learn about 3 steps that can guide success.

Can new digital medium voltage circuit breakers help facilities reduce their carbon footprint?

May 7, 2024
Find out how facility managers can easily monitor energy usage to create a sustainable, decarbonized environment using digital MV circuit breakers.

The Digital Thread: End-to-End Data-Driven Manufacturing

May 1, 2024
Creating a Digital Thread by harnessing end-to-end manufacturing data is providing unprecedented opportunities to create efficiencies in the world of manufacturing.

Voice your opinion!

To join the conversation, and become an exclusive member of Machine Design, create an account today!