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Old 9th May 2023, 2:28 pm   #21
ex 2 Base
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Default Re: B&D "Utility" 1/4" drill - Restuff Dubilier SBC7 capacitors?

I have a "Fobco" Drilling machine of about the same age as the B&D drill above, no RFI caps fitted or needed. The Fobco and others simlar machines have single winding insulation varnish , no one get concerned about them. Must be hundreds in home workshops. Winding a field coil is quite easy providing you can get the right size wire in small enough quantity, contact ED he might have a small amount, don't give up. Ted
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Old 9th May 2023, 2:58 pm   #22
Uncle Bulgaria
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Default Re: B&D "Utility" 1/4" drill - Restuff Dubilier SBC7 capacitors?

That's heartening, Ted. I took a look at the relevant coil and got spooked. It's quite rigid, wrapped in fabric tape. Perhaps it's coated in shellac and would be removed easily with alcohol or heat. Would it then be a case of trying to find the end of the tape, unwinding and counting the turns before re-winding? It could have been wound on the frame as it's very tightly held even with one of the clamping strip's ends bent back.
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Old 9th May 2023, 3:59 pm   #23
Lucien Nunes
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Default Re: B&D "Utility" 1/4" drill - Restuff Dubilier SBC7 capacitors?

There is a bit of a difference between what I take to be a Fobco pedestal drill with an induction motor, intended to be used in a workshop environment, and a handheld pistol drill with a universal motor.

It is still normal and conventional for pedestal drills to be Class I, because there is no need to protect the operator from either direct or indirect contact with the surroundings due to drilling outside the equipotential zone. The earth connection of a bench tool is not expected to be unusually vulnerable to accidental damage as it is in a handheld with a heavily used and possibly abused flex. Class II has been preferred for handhelds for many decades now due to these external influences, quite apart from the nature of the insulation within the motor. Obviously the nature of the windings is rather different too.
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