The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)

The Craftmans Shop > New from Old

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awemawson:
Yes Cliff definitely a good step forwards :thumbup:

Up early to put in yet another call to Australia to chase the original bits, according to a colleague they are still in a tote on PK's desk (who was off picking children up from school). There is now a large entry on his 'white board to do list' asking if I can please have my bits back :bang:

So while I was up I thought that I'd have another go at the MP12. It takes four AA cells, retained by a cover that also does the inter-cell bridging, with the 6 volts being picked up by a pair of spring loaded gold pins. Rigging up the lab power supply with croc clips on the pins, with my trusty Avo 8 in series showed me that when first connected there was an initial surge of perhaps 10 mA, very rapidly falling back to about 1 mA or less. However if I pointed my remote control for my 100 W led flood light at it, and gave it some random IR it would switch into a higher current mode - maybe 5 mA.

Re-installing the four AA batteries and exposing it to the OMM in the lathe there was still no response. Frustratingly like this I couldn't monitor its current draw.

However I conclude that the MP12 is at least partially alive, and can be switched into operating mode by a burst of IR. Still possible that it's signalling specification differs from the OMM.

I may try and make up some sort of replacement battery cover that lets me use a lab supply and monitor current while on the machine exposed to the OMM. This way I can get a better idea if the OMM is actually switching it from standby to the on state.

Brent Crude:
I have exactly the same MP12 here and was able to start it using the OMI I sent to you. I used the same wiring colours as on the piece of paper I included so it may be you have a bit more wrong with your probe as you suspect. I wonder how easy they are to pop open...

awemawson:
I 'think' that the body unscrews. With my smaller probe that was sentenced to transportation, PK made a gripper for the body to unscrew it, and I suspect that the construction is similar, using an 'O' ring seal between he two parts.

Do you know what the white LED that emerges downwards through the bit of the top that is not the battery retainer is supposed to indicate ? Perhaps 'probe triggered' status ?

*** later edit, I've found a datasheet implying that it's a switch that changes the probe mode - doesn't look like a switch to me ! ***

Brent Crude:
I’ve seen that too. I think there were two different versions of the MP12. Mine is the same as yours. Mine isn’t selling. I’m not fussed over mine. Hey, if you were to give me a silly name, you know the score, it might just appear for the cost of postage!! 🤪😃🤪😃

awemawson:
:thumbup:

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