Black&Decker runs anticlockwise - UK Vintage Radio Repair and Restoration Discussion Forum

greenstar · 23rd Jul 2023, 3:28 pm

I recently discovered my Dad's blue metal power drill when tidying up, and decided to check it over, as it has some sentimental value. When I was about 8 I remember sending him demented by drilling into things and blunting his bits! He didn't stop me using it.
All seems fine, brushes good, cable pvc and good, connections secure.
Tried it and it runs in reverse. it is a simple, single speed, non hammer, non reversible and original B&D.
I cannot understand why this should be. I do use these drills with a circuit breaker and rubber gloves, but it is well earthed. I may have been into this in the past, but can't remember. It seems nicely greased and clean so I may have, no one else has!
Can anyone shed some light?

Radio Wrangler · 23rd Jul 2023, 3:34 pm

Has it been apart?

This hppens if the connections to the brushes have been reversed, or those to the field coils.

David

Graham G3ZVT · 23rd Jul 2023, 3:35 pm

Any any evidence of the field windings being disconnected and reconnected incorrectly?

greenstar · 23rd Jul 2023, 4:01 pm

I must have opened this in the past. It is possible I changed the switch, for example. There is arcing from the brushes, although they seem to be seating ok and plenty of carbon left.
If I was to reverse connections, what would be best? Brushes? I can't see any obvious change has been made, although somebody, must have been me, has marked the live side of the switch.

Ed_Dinning · 23rd Jul 2023, 7:47 pm

Hi Arcing on brushes is to be expected to some extent, sometimes reduced with the addition of an X cap on the mains lead.

Either field or brushes can be reversed (not both), whichever is more convenient

Ed

23rd Jul 2023, 3:28 pm	#1
greenstar Octode Join Date: Jul 2011 Location: Leicester, Leics. UK. Posts: 1,662	Black&Decker runs anticlockwise I recently discovered my Dad's blue metal power drill when tidying up, and decided to check it over, as it has some sentimental value. When I was about 8 I remember sending him demented by drilling into things and blunting his bits! He didn't stop me using it. All seems fine, brushes good, cable pvc and good, connections secure. Tried it and it runs in reverse. it is a simple, single speed, non hammer, non reversible and original B&D. I cannot understand why this should be. I do use these drills with a circuit breaker and rubber gloves, but it is well earthed. I may have been into this in the past, but can't remember. It seems nicely greased and clean so I may have, no one else has! Can anyone shed some light?

23rd Jul 2023, 3:34 pm	#2
Radio Wrangler Moderator Join Date: Mar 2012 Location: Fife, Scotland, UK. Posts: 22,230	Re: Black&Decker runs anticlockwise Has it been apart? This hppens if the connections to the brushes have been reversed, or those to the field coils. David __________________ Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done

23rd Jul 2023, 3:35 pm	#3
Graham G3ZVT Dekatron Join Date: May 2010 Location: Greater Manchester, UK. Posts: 18,581	Re: Black&Decker runs anticlockwise Any any evidence of the field windings being disconnected and reconnected incorrectly? __________________ -- Graham. G3ZVT

23rd Jul 2023, 4:01 pm	#4
greenstar Octode Join Date: Jul 2011 Location: Leicester, Leics. UK. Posts: 1,662	Re: Black&Decker runs anticlockwise I must have opened this in the past. It is possible I changed the switch, for example. There is arcing from the brushes, although they seem to be seating ok and plenty of carbon left. If I was to reverse connections, what would be best? Brushes? I can't see any obvious change has been made, although somebody, must have been me, has marked the live side of the switch.

23rd Jul 2023, 7:47 pm	#5
Ed_Dinning Dekatron Join Date: Jan 2004 Location: Newcastle upon Tyne, Tyne & Wear, UK. Posts: 8,014	Re: Black&Decker runs anticlockwise Hi Arcing on brushes is to be expected to some extent, sometimes reduced with the addition of an X cap on the mains lead. Either field or brushes can be reversed (not both), whichever is more convenient Ed