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Other Vintage Household Electrical or Electromechanical Items For discussions about other vintage (over 25 years old) electrical and electromechanical household items. See the sticky thread for details.

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Old 30th Jan 2017, 7:25 pm   #21
mark_in_manc
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Join Date: Nov 2011
Location: Manchester, UK.
Posts: 1,872
Default Re: 1/2 hp SCR-based (?) DC motor controller

That's great - I'm learning all the time.

This drill has no back-gear and only a MT1 spindle / 1/2" chuck, but I can use reduced-shank ('blacksmith's') drills to make big holes in steel. Running at about 80rpm spindle speed with lots of torque is just the job - hence my dismay when it stopped working.

Talk of the devil and all that - today I found a 'Fracmo' 240v DC motor in someone's bin at work, with no less than 3 worm-drive reducing gearboxes on the end. We joked it would take your arm off...so long as one were a teenager at the start of the experience. So I really do need to draw out the speed controller on device #2 and see if I can make them all work.

Mods - this thread might be better called 'SCR controllers for fractional-horsepower 240v DC motors'!
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