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X3 Milling machine Motor Overheating and tripping house RCD

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raynerd:
 :Doh: Although I've been pottering and tinkering, I'm finally stuck into a project after nearly 2 years out due to house moves, work and kids. Got a bit of time, a lot of enthusiasm and finally building something worth showing you guys.

Went to my mill yesterday and faced off a piece of aluminium. Turned on the machine and took a few light cuts and pop, the electricity went with the house RCD tripping. Turning it all back on, nothing had broke or popped and I carried on suspicious but without an issue.

I've gone into my workshop tonight to cut some gears, turned on my mill and pop - mill immediately tripped out the electrics again. Turned it all off and I got back into it...very suspicious and keeping an eye out. Ran the machine for a minute or 3, took a cut again , then stopped and then pop, out it went. Obviously not turning it on again... But the motor is scorching hot so I can only presume it is a motor issue. The motor was far too hot to touch,

I'm not a motor expert and I'd appreciate anyone's advice. After a few years out, I've already got a scrap bin full of dead parts so this has just made me feel like the engineering gods are against me. I am determine to fix it if anyone could give me some advice as to where to look short of buying a new motor :-(

All the best

Chris

raynerd:
...just doing some googling and as it is the x3 with brushed motor, could it be the brushes? Would this cause it to over heat and trip the RCD?

Sid_Vicious:
I'm not an expert but I would opened it up (the motor) and looked at the brushes. Once in a motor I had it was only dust that made it difficult for the brushes to move so a good cleanup and they moved freely again and the motor worked again.  It's worth a try.

Kjelle:
If the RCD trips, thehre is a leak between phase ande ground.. Check all connections, from the outlet on. It sounds like something isn't quite there, either a short in the motor, or a loose connection...

Kjelle

lordedmond:
Does it have a mains filter for high order harmonics ( small box befor the main board )

These have delta cap in them eg two caps one from live , one from neutral the free end go to earth they can be the cause of the RCd trip

Note the mill will run without this but I have not said this because it can cause troubles with other household stuf

Motor hot how hot ? Can you keep your hand on it ?
Maybe the mill is a birth tight due to the cold weather

As a side note again I have not said this my Myford tripped the RCd from new one switch on and switch off due to the filter so dump the RCd they are overrated IMHO

You can get a RCd with a higher trip setting to get round the problem then it defeats the safety of the domestic RCd

As a old school sparks I believe in correctly fused/MCB and a good earth ( tested and proved) and a good equiptential Earth bond in the workshop and house

Stuart

The above is my view and not recommendations for others to follow

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