Author Topic: No, No this could be expensive!  (Read 13940 times)

Offline Jo

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No, No this could be expensive!
« on: November 10, 2013, 11:30:06 AM »
This morning I started japanning out the flywheel for the Double Tangye, when the Colchester started making funny noises "down below". I started by trying to check without the guard on but she was having none of that. I couldn't get the motor inspection plate off  so I took the contactor plate off nothing obvious. So having used my lady like muscles I have dragged the lathe out:



Then took the motor cover plate off:



The motor is hot, and when I run her the motor sounds like a bag of bones.  :facepalm2: Time to take the motor out and have a look.

Jo
« Last Edit: November 10, 2013, 12:00:27 PM by Jo »
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Offline sshire

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Re: No, No this could be expensive!
« Reply #1 on: November 10, 2013, 11:37:25 AM »
Jo
Noooooo! Sorry to hear of your malfunction.
Bad bearings? If that's it, a decent motor shop can get you up an running quickly and for a reasonable price. If the rotor is smacking the stator and has bunged that up, a new motor might be in your future. Hope not. But, if so, think about a VFD. I've got them on the lathe and on the Bridgeport and would never go back.
Fingers crossed.
Best,
Stan

Offline Jo

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Re: No, No this could be expensive!
« Reply #2 on: November 10, 2013, 11:59:52 AM »
Thanks Stan,

I have hooked the motor out and sat her on the floor and run her she doesn't sound 100% but is still trundling ok. I've whipped the back off she looks to be wired in star:



Ok I don't normally have a good word to say about he who hath gone   :hellno: but he claimed to have found a 2 speed motor for the colchester all those years  :old: ago.



Well he wasn't much of an electrician I've just read the label it is the same speed/rating of motor as is fitted  :lolb:. Maybe that was why he didn't fit it like he promised he was going to  :naughty:

Jo

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Offline Don1966

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Re: No, No this could be expensive!
« Reply #3 on: November 10, 2013, 12:09:46 PM »
Jo, is your motor dual voltage? Looking at your connection it should be Delta, us less specified otherwise. If someone you know has an amp meter, have him amp check the motor. Even if the amps are higher than the name part value as long as all three legs  read the same value means the motor is good. Then your bearing could be bad. Bad bearings causes a good rumble in the motor.

Don

Offline Jo

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Re: No, No this could be expensive!
« Reply #4 on: November 10, 2013, 12:14:05 PM »
Thanks Don  :ThumbsUp:, Its the hot electrical smell that is worrying me.

Short term I am planning on swapping the motor over with that new one I have found, it says Student/Master in pen on it so I am assuming it was the college's spare motor for these machines  :).

Then after I have done the flywheel I might take this one apart. Interstingly both have their card instruction books in the electical box. 

Jo
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Offline Don1966

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Re: No, No this could be expensive!
« Reply #5 on: November 10, 2013, 12:20:07 PM »
Jo, if you swap motors please amp check it or you could end up burning it. Amp checking a motor will tell you if it's miss connected or you have loss a three phase leg.

Don

Offline Jo

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Re: No, No this could be expensive!
« Reply #6 on: November 10, 2013, 12:22:37 PM »
What do you mean by lossed a three phase leg? Are you thinking that one of the contactors might not be making? I use the same three phase converter on the harrison.

I just turned on the Harrison.. She is making funny noises. So it is now pointing towards the transwave unit...

Jo
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Offline Don1966

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Re: No, No this could be expensive!
« Reply #7 on: November 10, 2013, 12:32:19 PM »
Yes! If all possible have someone amp test it. Or check for loose connection.

Don

Offline Jo

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Re: No, No this could be expensive!
« Reply #8 on: November 10, 2013, 12:41:20 PM »
I'll keep my fingers crossed for a loose connection.. about to lift the transwave's lid  :(.

Jo
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Offline Jo

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Re: No, No this could be expensive!
« Reply #9 on: November 10, 2013, 12:59:46 PM »
The lid is off the transwave (3 phase converter) and there is nothing obvious:







The contactor for the boast seems to be working when the machines start up but the current is remaining high as if it is still trying to start on two phases and the third hasn't formed.

For some reason I am not enthusiastic about getting my hands in there with the power on.

Jo
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Offline Don1966

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Re: No, No this could be expensive!
« Reply #10 on: November 10, 2013, 01:14:44 PM »
Jo, from what you are saying it is obvious that you have loss a phase. I think you need to get a professional to look at it. Best be safe electricity is not to forgiving.

Don

Offline steamer

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Re: No, No this could be expensive!
« Reply #11 on: November 10, 2013, 01:43:55 PM »
Wot Don said!.....I'd stop right there Jo.

Dave
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Damned ijjit!

Offline Jo

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Re: No, No this could be expensive!
« Reply #12 on: November 10, 2013, 01:58:32 PM »
I did 4 years as an Electrical/electronics Apprentice and then worked on 600V DC equipment for about a year. So I am under no illusions about the dangers of electrics.

I'll contact MSR in the morning..

Jo
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Offline steamer

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Re: No, No this could be expensive!
« Reply #13 on: November 10, 2013, 03:00:01 PM »
No such illusions, or lack of understanding Jo was not what prompted my comments Jo....I know you know your stuff...........but lack of proper measurement equipment to hand was my angle.   These guys have the right tool for the job......you know how important it is to have the right tool and know how to use it right? 8)

Dave

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Damned ijjit!

Offline steamer

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Re: No, No this could be expensive!
« Reply #14 on: November 10, 2013, 03:02:45 PM »
My Logan really didn't like the static phase converter, and it would get hot and trip the heaters in the breaker fairly quickly,   I then added an idler motor to the circuit and basically made a RPC.  It is much happier with that...though If I am putting the beans to him for a while, I can still trip the breaker.

Dave
"Mister M'Andrew, don't you think steam spoils romance at sea?"
Damned ijjit!