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Diabolical Artificer · 5th Feb 2023, 5:09 pm

Thanks both, that's a good idea re fitting the SW to the carriage. I got the thing to work but for a test I SW'd the direction by hand, result? A mess. The DC motor is too fast, it'd need either a reduction box or probably something more complex.

I'm trying to stay away from Arduino's, I just haven't the temperament to fiddle about with the damn things. Thanks for all those links David, you've made some very pertinent points about bunching etc. When winding EI tfmr's the turn's have to be bang on, you've only a limited window. I'm going to have to put a lot more thought into this. The coil winder in David's link #1 wouldn't last 5 minutes with big EI bobbins. The one I have is very well engineered, but the control gear, the one from Nut's & Volts is infuriatingly faffy.

At present I've wound half the primary by hand, it's only 2 x 172T of 1mm/18 gauge, it's a big Tektronix 500 series scope tfmr, approx 750VA with many windings, it has to be bang on 100% correct, I may just wind it by hand.

Andy.

5th Feb 2023, 5:09 pm	#10
Diabolical Artificer Dekatron Join Date: Jul 2009 Location: Sleaford, Lincs. UK. Posts: 7,670	Re: Motor control circuit. Thanks both, that's a good idea re fitting the SW to the carriage. I got the thing to work but for a test I SW'd the direction by hand, result? A mess. The DC motor is too fast, it'd need either a reduction box or probably something more complex. I'm trying to stay away from Arduino's, I just haven't the temperament to fiddle about with the damn things. Thanks for all those links David, you've made some very pertinent points about bunching etc. When winding EI tfmr's the turn's have to be bang on, you've only a limited window. I'm going to have to put a lot more thought into this. The coil winder in David's link #1 wouldn't last 5 minutes with big EI bobbins. The one I have is very well engineered, but the control gear, the one from Nut's & Volts is infuriatingly faffy. At present I've wound half the primary by hand, it's only 2 x 172T of 1mm/18 gauge, it's a big Tektronix 500 series scope tfmr, approx 750VA with many windings, it has to be bang on 100% correct, I may just wind it by hand. Andy. Attached Thumbnails __________________ Curiosity hasn't killed this cat...so far. Last edited by Diabolical Artificer; 5th Feb 2023 at 5:16 pm.