27 Sep '15, 9pm

A young engineer in training learns the hard way that carbon dust burns and to use his voltmeter first:

A young engineer in training learns the hard way that carbon dust burns and to use his voltmeter first:

In the summer of 1965, I went to work in the family airline business as a radio technician. As a new hire, I got the jobs that were in line with my experience and that nobody else liked to do, such as sweeping the floors and cleaning the shop. One interesting assignment was to repair and overhaul the large backlog of MG-149G and H-model rotary inverters. Our DC-3 and C-46 airplanes used the inverters, dc motors with ac generators that ran off the airplanes’ main 28V-dc bus and supplied 115V ac and 400 Hz for certain radio-navigation equipment and instruments. Overhaul involved completely disassembling and cleaning the unit. Once I cleaned up the components, I thoroughly examined them to check for anything out of the ordinary. The inverter rotor had a bearing in each of the end bells. The rotor had some sealed bearings and some open bearings. I had to thoroughly clean and r...

Full article: http://www.edn.com/electronics-blogs/tales-from-the-cube/...

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