Author Topic: David's Mini Lathe......  (Read 655 times)

Offline Stilldrillin

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David's Mini Lathe......
« on: October 08, 2019, 04:17:14 PM »
One of my pals, died last year. He was a member on here. davidcurtiss021.

Poor chap, never properly, got to grips with retirement, or making swarf. Alternately, he was unwell. Or his lathe was..... 

This was one of his final problems..... https://madmodder.net/index.php/topic,12166.0.html

The lathe is mine now. It arrived, as a  lego set, in several boxes. In serious need of rebuilding.

I started during the summer......




I finished the mechanical work, this weekend.......




Next up. The electricals. Never before, fumbled with Sieg's, mysterious clever stuff.....




Inside the box.......




And, back view of the loose board......




I plugged together, what seemed to fit together.

Not sure which way around the input lead fitted, as both outputs from the emg switch, were black/blue wires.

Switched on. Hoping for a click. Or, a little light...... Nothing!  :scratch:

HAH! No fuse, in the plug.  :thumbup:

Fitted 3amp fuse. Switched on..... Nothing!  :scratch:

Metered the supply, into this gubbins. But, not out of it......




No fuse in there, either......  :thumbup:

Fitted another 3amp fuse. Switched on..... Nothing!  :scratch:

Checked the fuses. Both of them had blown. Quietly....  :(


That is the limit of my electrical understanding. It's time now, to hand over to a higher authority.

Hope you guys can sort me out, as you have done several times in the past......
David.

Still drilling holes... Sometimes, in the right place!

Still modifying bits of metal... Occasionally, making an improvement!

Offline Deko

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Re: David's Mini Lathe......
« Reply #1 on: October 09, 2019, 06:59:47 AM »
I would love to be able to help Dave, but electrics I am OK with, electronics are way beyond me.  :zap: 

Sad to hear of your mate dying, but that is one of the things that old age brings with it. I have lost quite a few mates in the last few years.  :(

Seeing that you are still posting is great, and I wondered if you would be going to the Midlands show next weekend ???  :beer:

Cheers Derek.

Online John Rudd

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Re: David's Mini Lathe......
« Reply #2 on: October 09, 2019, 07:09:11 AM »
David,
As usual always glad to help.....

First up, have you got a dvm, know how to use it?
Can you follow a schematic drawing?

Is there an XMT number on the speed control board? ( I think it might be XMT 2335 or summat...)
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Offline Joules

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Re: David's Mini Lathe......
« Reply #3 on: October 09, 2019, 11:29:29 AM »
David, youíre not a million miles away from me (Rotherham). I have a fair bit of electrical test equipment if you need help.   Available weekends.  :dremel:  and a very similar Mini lathe here.
Just get doing and make swarf, you can decide what its going to be later.   :thumbup:

Offline Stilldrillin

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Re: David's Mini Lathe......
« Reply #4 on: October 09, 2019, 05:00:08 PM »
I would love to be able to help Dave, but electrics I am OK with, electronics are way beyond me.  :zap: 

Sad to hear of your mate dying, but that is one of the things that old age brings with it. I have lost quite a few mates in the last few years.  :(

Seeing that you are still posting is great, and I wondered if you would be going to the Midlands show next weekend ???  :beer:

Cheers Derek.

Hi Derek.
 Thanks for your kind words.
I reckon, you will have met David, back in the Harrogate days.....

I'm afraid, me old feet n legs are not up to show standard anymore.
 Only allowing up to an hour at a time. Even if I'm doing something really interesting, in the shop......  :(
David.

Still drilling holes... Sometimes, in the right place!

Still modifying bits of metal... Occasionally, making an improvement!

Offline Stilldrillin

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Re: David's Mini Lathe......
« Reply #5 on: October 09, 2019, 05:12:56 PM »
David, youíre not a million miles away from me (Rotherham). I have a fair bit of electrical test equipment if you need help.   Available weekends.  :dremel:  and a very similar Mini lathe here.
Joules.
 All the years, I have seen your handle. I thought you were in France! Not just up the road!  :palm:

Thanks for your kind offer.
 
David.

Still drilling holes... Sometimes, in the right place!

Still modifying bits of metal... Occasionally, making an improvement!

Offline Stilldrillin

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Re: David's Mini Lathe......
« Reply #6 on: October 09, 2019, 05:26:15 PM »
David,
As usual always glad to help.....

First up, have you got a dvm, know how to use it?
Can you follow a schematic drawing?

Is there an XMT number on the speed control board? ( I think it might be XMT 2335 or summat...)
Hi John.
 This is becoming a habit, isn't it! :palm:

Dvm? Sounds like my little black box, with a needle in a window.
 Tells me if a fuse is good, or blown.... Also, if a wire is live, or not. (A few other things, as well).  :thumbup:

Schematic drawing? Probably.
 This one will be no problem. Mebbe...   http://littlemachineshop.com/reference/drawings/4507-XMT-C3Lathe.pdf

XMT-2335........




Are we off to a good start?  :thumbup:
David.

Still drilling holes... Sometimes, in the right place!

Still modifying bits of metal... Occasionally, making an improvement!

Offline Joules

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Re: David's Mini Lathe......
« Reply #7 on: October 10, 2019, 01:03:43 AM »
I found this, but I guess itís probably out of date being from 2006.  It is however a starting point.

Just get doing and make swarf, you can decide what its going to be later.   :thumbup:

Online John Rudd

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Re: David's Mini Lathe......
« Reply #8 on: October 10, 2019, 04:24:00 AM »
David,

I'm assuming you have all the wiring in the right place...,,?


****With the lathe unplugged from the mains***

With new fuses fitted where needed, meter switched to Ohms range, can you measure between the Live and Neutral pins on the 13Amp plug, do this with the Red E-stop button not latched....
What reading do you get on the meter?

We are looking for a low value that is causing the 3A fuse to blow......

If the result is good, that is there is no short across the supply, I suggest disconnecting the motor and in its place a 100 watt light bulb, then try the machine plugged in..


Joules, good find on the schematic...the circuitry hasnt changed much over the years, they are basically the same as the KB boards from the USA..
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Offline Stilldrillin

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Re: David's Mini Lathe......
« Reply #9 on: October 10, 2019, 04:23:07 PM »
Hi Joules.
 Thanks for the diagram. I'm afraid, it's lost on me, these days.

In the past, I have built a couple of rc, (valved) receivers. But, that was some 60+ years ago......
David.

Still drilling holes... Sometimes, in the right place!

Still modifying bits of metal... Occasionally, making an improvement!

Offline Stilldrillin

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Re: David's Mini Lathe......
« Reply #10 on: October 10, 2019, 04:29:57 PM »
Hi John.
 This evening, I have checked the wiring against the little mc shop diagram.
All is correct. Though, several terminal screws were a little loose.

Tomorrow, I'll apply the meter......  :zap:
David.

Still drilling holes... Sometimes, in the right place!

Still modifying bits of metal... Occasionally, making an improvement!

Offline Joules

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Re: David's Mini Lathe......
« Reply #11 on: October 10, 2019, 04:41:35 PM »
No worries David, the schematic is here for you and others.   Perhaps over time we can build up a table of test points and voltages for others to fault find from, as it seems a common problem sorting these boards out.
Just get doing and make swarf, you can decide what its going to be later.   :thumbup:

Offline Stilldrillin

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Re: David's Mini Lathe......
« Reply #12 on: October 11, 2019, 10:30:08 AM »
What reading do you get on the meter?

We are looking for a low value that is causing the 3A fuse to blow......

Is this low enough, John?  :palm:

David.

Still drilling holes... Sometimes, in the right place!

Still modifying bits of metal... Occasionally, making an improvement!

Online John Rudd

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Re: David's Mini Lathe......
« Reply #13 on: October 11, 2019, 12:09:19 PM »
David, that is a low reading, likely to cause a fuse to blow....

I see there's a little power supply in one of the previous fotos, can you disconnect the power feed to it and measure again?
If the reading is still low, can you disconnect the mains wires going to the speed board and try again...?
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Offline Stilldrillin

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Re: David's Mini Lathe......
« Reply #14 on: October 11, 2019, 02:57:43 PM »
John.
 The speed control knob doesn't click, off. In the stop position.
Thinking this might be at fault, I disconnected all three wires. No difference.

 The feed wire to the transformer, is already, not connected to anything. In the pic, it lays over the top of the control box.

I have also pulled out the plug, where the wire to readout connects.

No difference......  :bang:
David.

Still drilling holes... Sometimes, in the right place!

Still modifying bits of metal... Occasionally, making an improvement!

Online John Rudd

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Re: David's Mini Lathe......
« Reply #15 on: October 11, 2019, 03:44:25 PM »
David,
The two wires connected to the speed control board at the Line In terminals, can you disconnect them from the board, then:
1) measure the resistance across the L and N pins of the mains plug ( do this with E stop in its normal state) ( this will determine if there is a fault in the incoming wiring stuff)
2) measure the resistance across the two Line In terminals on the speed control board...
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Offline Stilldrillin

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Re: David's Mini Lathe......
« Reply #16 on: October 11, 2019, 04:37:02 PM »
John.
 Wires disconnected. Meter across plug pins... No reaction.

Meter across, the two terminals. Needle fully over, reading zero.
David.

Still drilling holes... Sometimes, in the right place!

Still modifying bits of metal... Occasionally, making an improvement!

Online John Rudd

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Re: David's Mini Lathe......
« Reply #17 on: October 11, 2019, 05:16:40 PM »
David looks like theres an issue with the board then...

Would you like me to look at it and effect a repair?   :zap:

( I just checked, a new board is £132... From Arc..Ouch, didnt think they were that much...)
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Offline Stilldrillin

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Re: David's Mini Lathe......
« Reply #18 on: October 11, 2019, 06:05:34 PM »
Please John. I certainly would!

It's a pity, I can't fit one of the spares, you repaired last year.....

No rush. I'll detach, and box it up, over the weekend.

Thanks for your input. I've enjoyed this little fault finding exercise.....
David.

Still drilling holes... Sometimes, in the right place!

Still modifying bits of metal... Occasionally, making an improvement!

Online John Rudd

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Re: David's Mini Lathe......
« Reply #19 on: October 12, 2019, 03:45:12 AM »
Do you have my current address? I'll message it to you...
I dont live in Hull anymore.....

Why cant you fit one of the others? Are these the KB boards?
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Offline Stilldrillin

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Re: David's Mini Lathe......
« Reply #20 on: October 12, 2019, 04:28:36 PM »
John.
 I have your address, from Feb/ Mar, last year. When you repaired two KB boards.

Still not installed/ tested em! The best way to never have a breakdown, is to have spares.....  :thumbup:
David.

Still drilling holes... Sometimes, in the right place!

Still modifying bits of metal... Occasionally, making an improvement!