Gallery, Projects and General > How do I??

Mini lathe motor. Once again.....

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John Rudd:
David,
Can you disconnect the speed pot from P1,2&3 and re measure please?
Then measure the voltage at the ends of R17 ( the big grey resistor) with the meter negative lead still connected to I1...

I am expecting to see 12v at the 12v pad, around 22v at the end of R17 ( the end nearest the board edge) and a much higher voltage the other end....

Meanwhile if you have a good working board, swap it out for the faulty one to get you going....

Stilldrillin:


No problem, over here, Eric......  http://www.amadeal.co.uk/acatalog/Potentiometer-AMA_SP_CJ18_157.html#SID=189

If you don't want to order, yourself. I'd be happy to post one to you.....  :thumbup:

Stilldrillin:
John.

1, 2, 3 disconnected.  Initial, 'kick'. Dropping to 2v.....

Outer end of R17..... 2v.
Inner end..... 500v.  :bugeye: ?  :zap:

I've located the spare board.
 Deemed, a good 'un. By Dave Bluechip. Several years ago......

John Rudd:
David,
My apologies, could you conduct the tests again,

But this time with meter black lead connected to F- on the board.....

Think I need to look for the board schematic after this, its hidden away somewhere in my manuals.....

Let me know how you get on....

Oh, one more thing, can you check the horsepower resistor? On ohms it should read zero-ish and is plugged in proper like....

Stilldrillin:
No problem, John!  :thumbup:

Pad to F-. 1, 2, 3 disconnected..... Initial, 19v. Increasing, to 26v.

R17..... Outer, 50v.... Inner, 500v


Pad to F-. 1, 2, 3 connected..... 28v.

H/P resistor. 9 ohms. Properly plugged.


The replacement board.
 The original one, from the initial, Chester Conquest lathe.




Repaired, 2012......




Well..... The Stilldrillin Engine Orphanage, pre-Christmas party, is now, in full swing. Time to close the shop door, for a couple of days.....

Wishing, a HAPPY CHRISTMAS, to all Modders......

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