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Real Bull mini-lathe circuit board diagrams.

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andyf:
I was contacted recently by a gentleman called Pat Darragh, who had seen a bit of info on my website about the KB Electronics KBIC/KBLC 240 control boards - the type I use to run the treadmill motor on my old milling machine. He has a Chester Conquest, which like the mini-lathes supplied in the UK by Warco and Amadeal, comes from the Real Bull stable cattle shed in China.

It turns out that he is conversant with electronics. He must be patient, too,  because he has analysed and drawn up both the speed control board and the ancilliary board which turns the motor on and off, brakes it, and provides the 5v power supply for the tachometer sensor and display.

He has very kindly allowed me to put his work on my website so it reaches a wider audience. If anyone needs it, it starts half-way down this page: 
< http://andysmachines.weebly.com/variable-speed-controls.html >.

Andy

Stilldrillin:
Thanks Andy, and Pat!  :thumbup:

I'll probably need some of that info, eventually........  :palm:

David D

hopefuldave:
More thanks to you both! I have a number of "fried" KB boards, if I can repair 'em they can be pressed into service...

I'm attempting a task like Pat's on the thyristor controllers found in some of the small milling machine power feeds - if I can get it worked out I'll post the diagram; Andy, you'd be welcome to put it on your site?

Dave H. (the other one)

andyf:

--- Quote from: hopefuldave on April 05, 2012, 08:03:12 PM ---More thanks to you both! I have a number of "fried" KB boards, if I can repair 'em they can be pressed into service...
I'm attempting a task like Pat's on the thyristor controllers found in some of the small milling machine power feeds - if I can get it worked out I'll post the diagram; Andy, you'd be welcome to put it on your site?
Dave H. (the other one)

--- End quote ---

Hi Dave,

As to your fried KB boards, and in case it helps, I was contacted by a Dutch chap who had blown a power diode on the KBIC/KBLC 240 board in his minilathe, seeking help in finding replacement power diodes. His Gooling the "D8010L" on the parts list didn't produce results. I located some in the UK - an extract from my reply to him appears below in blue, to save my typing finger.

If you are making a power feed for a small mill, you might consider a 12V motor powered by something like the Velleman K8004 PWM power control; get to it from this page:
< http://www.esr.co.uk/velleman/products/index_kit.htm >.
Geared 12V motors from China which do 30, 60 or 120 RPM are under £10 on Ebay, and one of them will happily push along the table of my small Dore Westbury miller.

Andy.

The D8010L is a 10A diode, and the D8020L is 20A. You could use two D8020L diodes; one of them would be overspecified, but that would not make any difference to its operation.
 
This seems to be a suitable source < http://parts.digikey.co.uk/1/1/264192-rectifier-800v-20a-220-d8020l.html > . They charge a lot for shipping, though the diodes are not expensive at about 2 Euros each.
 
Here is another UK supplier < http://www.dalbani.co.uk/catalogue/product_details.php?id=34855 >. I don't know how much they charge for shipping, because you have to register on the site before ordering.
 
I found them by Googling "Teccor D8020L".

Bluechip:
Both the S8020L SCR & the D8020L Diodes are also available from Farnell.

SCR link ...

http://uk.farnell.com/jsp/search/browse.jsp;jsessionid=5FK55CFDZBCCWCQLCIPZOXQ?N=0&Ntk=gensearch&Ntt=s8020l&Ntx=mode+matchallpartial&exposeLevel2Refinement=true&suggestions=false&ref=globalsearch&_requestid=506494

Diode link ..

http://uk.farnell.com/littelfuse/d8020l/diode-standard-20a-800v-to-220/dp/1456539?Ntt=d8020l

Which is where I got mine from when the WM16 controller went  :zap:  :zap:


BC

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