Author Topic: Warco mini lathe  (Read 766 times)

Offline John Rudd

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Warco mini lathe
« on: February 25, 2021, 11:05:43 AM »
Just got a Warco mini lathe to repair...it looks like it been 'got at'....

Its the version that has the digital control panel with the speed readout...

What I need to know is where does the little speed pick up board attach ...?  It lives under the gear change cover on the left of the machine, I can see the slotted disc, but nowhere for the pickup to attach....

Anyone got one? A photo would be nice..

TIA.
John
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Location:  Backworth Newcastle

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Offline Peter Cordell

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Re: Warco mini lathe
« Reply #1 on: February 25, 2021, 02:09:28 PM »
I think this is what you are looking for john
http://www.mini-lathe.com/Mini_lathe/Reviews/Big_dog/gears02.jpg


Pete

Offline John Rudd

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Re: Warco mini lathe
« Reply #2 on: February 25, 2021, 02:24:11 PM »
Pete,

A thousand thank yous to you...... :beer: :beer: :beer:

I cant help but think that this machine has been 'tinkered with'......

But now have the confidence that there is a missing hole for the board to be attached to....

A job for tomorrow now, and I can get it back to its owner...

Once again many thanks...

John
eccentric millionaire financed by 'er indoors
Location:  Backworth Newcastle

Skype: chippiejnr

Offline Peter Cordell

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Re: Warco mini lathe
« Reply #3 on: February 25, 2021, 02:39:47 PM »
The fitting for the sensor is like  the old meccano L brackets one side has a round hole the other has a slot thats about it,
The round hole has a small nut and bolt going to the sensor the slotted hole has a selftapping screw into the metal casing,

The sensor wire just runs unprotected round the outside and slips under the side of the control box hopefully not getting trapped


Pete

Offline John Rudd

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Re: Warco mini lathe
« Reply #4 on: March 02, 2021, 02:57:53 PM »
Well after getting the runaround on this lathe, I finally got it sorted....

Its very rare to see closed loop control on speed on a lathe....And this lathe is an exception...

After replacing the slotted opto device I got the lathe to run....but the tacho readout was way off.....by a factor of 4....

Top speed of the lathe is supposed to be 2500 rpm....Not 10,000!!!


Looks like somone has been fiddling and fitted the wrong encoder disc...I made another out of fibre glass pcb  and cut 10 slots...Painted it black.

Now we get the right speeds...

All sorted now so its owner is coming to collect on Thursday hopefully....


THE END.....
eccentric millionaire financed by 'er indoors
Location:  Backworth Newcastle

Skype: chippiejnr

Offline Spurry

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Re: Warco mini lathe
« Reply #5 on: March 02, 2021, 04:32:21 PM »
Well done John. It's always harder to sort others' "repairs" than start from scratch. :thumbup:
Pete

Offline hopefuldave

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Re: Warco mini lathe
« Reply #6 on: March 03, 2021, 06:08:10 PM »
Don't think it is closed-loop, the encoder just runs the tacho and speed is maintained by IR compensation set by the IR COMP pot on the speed control board.

Dave H. (the other one)
Rules are for the obedience of fools, and the guidance of wise men.

Offline John Rudd

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Re: Warco mini lathe
« Reply #7 on: March 04, 2021, 02:05:37 AM »
Dave,
There arent  any preset adjustments on either of the two boards....
The main board houses the power supplies and motor drive mosfet, the micro board has the tacho section and generates the pwm signal for feeding the main board.

https://ashermade.com/2019/03/10/mini-lathe-pwm-controller-repair-cj0618/
« Last Edit: March 04, 2021, 02:41:06 AM by John Rudd »
eccentric millionaire financed by 'er indoors
Location:  Backworth Newcastle

Skype: chippiejnr