Hi Guys,
I'm sure that many of you will remember when the plastic gears got damaged on my mill and I built new metal replacement ones ! Well today I was drilling a 5 mm hole in a piece of 10 mm diameter rod ready to tap a M6 thread in it, when the lights went out and everything stopped. The main circuit breaker had tripped. Well there were three things switched on in the workshop, one of them being the mill. Sure enough when I reset the breaker, the mill was dead. It turned out that the motor had caused the problem. The first thing I did was to check the motor carbon brushes, this being a very common issue with the motors on these mills. The photographs show what I found.
Obviously the copper pigtail has lost its continuity with the carbon brush causing the spring to have to handle all the motor current which in turn has destroyed the temper of the spring causing it to collapse and then allowing the brush to loose contact with the commutator. I should have taken pictures of the brush holders inside the motor housing. The insulation on the wires has become so hot that it has melted and allowed the wire to come into contact with the motor casing, causing the breaker to trip.
Its to late to go back into the workshop now but I will take pictures of the inside of the motor casing tomorrow and post them here.
I'm sure that many of you will remember when the plastic gears got damaged on my mill and I built new metal replacement ones ! Well today I was drilling a 5 mm hole in a piece of 10 mm diameter rod ready to tap a M6 thread in it, when the lights went out and everything stopped. The main circuit breaker had tripped. Well there were three things switched on in the workshop, one of them being the mill. Sure enough when I reset the breaker, the mill was dead. It turned out that the motor had caused the problem. The first thing I did was to check the motor carbon brushes, this being a very common issue with the motors on these mills. The photographs show what I found.
Obviously the copper pigtail has lost its continuity with the carbon brush causing the spring to have to handle all the motor current which in turn has destroyed the temper of the spring causing it to collapse and then allowing the brush to loose contact with the commutator. I should have taken pictures of the brush holders inside the motor housing. The insulation on the wires has become so hot that it has melted and allowed the wire to come into contact with the motor casing, causing the breaker to trip.
Its to late to go back into the workshop now but I will take pictures of the inside of the motor casing tomorrow and post them here.
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