Doesn’t seem to a schematic so hard to assess whether it would be any more robust.  Better I think to buy a KBE unit, the one on my little mill seems to be bulletproof (so far!…)

Doesn’t seem possible without paying?

Thanks, but that goes to the first two pages but it does not seem possible to see subsequent ones – you just get a “preview” message and an invitation to purchase the issue or subscribe?

Absolutely agreed Michael. Just makes it hard to judge whether this might be better than the originals.  Lower risk would be a proper industrial controller and they aren’t that expensive.

Robert

I have access to the article but have only skimmed through it. It does look like the output is not true dc but a pulse width modulated version of the full wave rectified mains (ie does not have smoothing capacitors). The setting up of the various pots is detailed in the article. It uses an IBGT for the output.

Stuart

Being pedantic perhaps but I still maintain ACCURATE speed control is not required. What is required is CONSISTENT speed under varying load. A vairiation of +- 10 or even 20% will not make any sigificant difference on a lathe This can easilly be done with a brushed DC motor with load compensation. Speed drop under load is more likely to be due to a lack of motor power.
I’d also question your “100% compatible” comment. This design is not specific to mini lathes and is not a “plug and play” replacement for a mini-lathe PCB. It is an electronics project.

Robert.

On 30 October 2024 at 03:07 Andre ROUSSEAU Said:

… Furthermore, I don’t recall saying anywhere or making a single reference to this circuit being a “plug-and-play” replacement for a mini-lathe PCB. By return reply, could you please provide me the screenshot where you can demonstrate I made such a claim, I would be most interested to see it. …

Well, Andre your opening post says, my bold: “Experienced a complete failure of the DC motor-controller of your Chinese-made mini-lathe/mill? …..what to do? NO problem! Get a hold of “SILICON CHIP” magazine, July & August 2024 issues wherein you will find a construction article for a 100% compatible motor controller, indeed, it was designed specifically for this type of motor.”

With respect, though this doesn’t actually use the words ‘plug and play’, I read it that way.  It’s a hazard of the internet: quite a few of my posts are misunderstood!

Where I agree with Robert is that the article describes an electronics project, not an easy way of replacing a burnt out board.   The big problem with it as a practical answer is cost.  An amateur will probably have to buy all the components retail and that makes a DIY build very expensive compared with buying a mass-production controller.   Especially if he has to have the PCB made, and doesn’t have the electronics wherewithal needed to assemble, test and debug it.

I was interested to read the article and resulting comments, but no way would I make one – even though I could.

Dave

Dave

On 6 November 2024 at 06:54 Joseph Noci 1 Said:

Meds not working anymore Andre?

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Thanks Joe for the reminder (thumbs up)

This thread is becoming very vitriolic and personal. I have not seen anything quite like this on this forom for a while.

Can I remind us “practical people” on here, that there is more than one solution to an engineering problem?