The Craftmans Shop > New from Old
Rebirth of a Denford MIRAC CNC Lathe
russ57:
Another possibility ; although I do like the swarf idea.
Moisture in some insulator. Leakage to earth.
Letting it run for a while with higher leakage allows it to dry.
But the smoking gun is still the disconnected earth. Obviously been a long standing problem. Maybe a leaky cap which reformed?
Russ
awemawson:
Russ and NRML thanks for the suggestions. Swarf is always a possibility but I did give it a comprehensive blow out with an airline several times. I like the tin box idea - I shall store it away - the manufacturers agent says that the reservoirs are still available and I'm awaiting their pricing.
The machine has been in a heated and dry environment for quite a while now so I doubt dampness was the cause, and certainly no sign of it in the culprit inverter. It was plugged into the 100mA protected circuit for probably less than half a minute - just long enough for me to realise that it hadn't tripped !
As was said, the disconnected earth wire is a smoking gun - someone has been down this path some years ago. If the problem returns I'll have the inverter out on the bench and do a proper diagnosis, my suspicions of the filter components are entirely without evidence - just based on previous experience - so I suppose you'd call it prejudice. (which after all is only making decisions based on prior experience!)
AdeV:
--- Quote ---prejudice. (which after all is only making decisions based on prior experience!)
--- End quote ---
Hmm... actually prejudice is the exact opposite of making decisions based on (prior) experience...!
My favourite definition which fits here I think: “Intelligence is the ability to learn from your mistakes. Wisdom is the ability to learn from the mistakes of others.” I'm pretty sure that means you have wisdom here :scratch: :lol:
awemawson:
Frustrating day today trying to remove the white casing for stripping. All screws removed but it seems horribly likely that there are some only accessible from the rear having removed the large electrical box. This would be a major undertaking - lots of cables between the two. But also rather puzzling, as I'm sure the cover was supposed just to unbolt and lift off to allow servicing of the spindle motor and stepper motors.
There seems to be a cavity formed in the metal work 'up high' above the lathe itself - and I suspect hat it has a rear mounted access panel under which are the elusive screws.
In desperation I've fired a question off to the Denford Forum, but it's rather in-active so don't have high hopes of help :scratch:
Meanwhile the reasonably good news is that a lube oil reservoir IS available at about £30 which isn't too bad.
awemawson:
So another email from the Interlube agents, and the 'about £30' has grown to £38 plus VAT plus £20 carriage plus VAT - or actually £69.60 in total. There is a 4-5 week delay 'as they are made to order' !!! The idea of a tin box inside becomes increasingly attractive, or I might even 3D print one.
Meanwhile I'm draining out the old coolant - the constant dripping in the background doesn't half make me want to keep going for a p... :clap:
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