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[TCML] Coil V1.8
Here's a video of the coil with the secondary I wound over the weekend, running at 100V out of 140V on the variac. <http://yfrog.com/0rcoil2z> This secondary is built around 4" schedule 40 PVC, so it's about 4.5 inches in diameter. It's 23" of 26Ga. My last working coil was around a 4" form, so there's a 1/2 inch added of width there.
Bart pointed out to me that on my last attempt all the arcing between the primary and racing arcs were caused by overcoupling, as we determined from JavaTC. I cut the innermost turn out of my primary, which gave me an additional 1/2 inch. The innermost turn of the primary is now , roughly 1/5" from the lower windings of the secondary. However, my lead wire for the primary is still going through the same hole, so it's closer. I saw a spark from there to the secondary when I reached 120V so I stopped. I will redrill the primary platform and run the lead to the innermost turn 1/2" further out.
I have also acquired another motor for another try at an ARSG. Just can't stand the failure of my first, I suppose.
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Update - I cut out ANOTHER inner turn on my primary - the distance between my primary 1st and the windings of the secondary is now about 1 3/4 inch.
I STILL got some racing arcs (on my brand new baby) at about 110V on the variac. So I raised the primary by 1/2 an inch. I can increase the variac to about 120v, but now I get some "sputtering" on the SRSG. So I'm suspecting I have a problem like I did a month ago, where we found out it was a timing issue, due probably to this "back emf" or "back voltage" problem John mentioned.
I'm still trying to get to a full 140v on the variac. I will tweak the timing a bit more, and maybe raise the secondary another 1/8" or 1/4".
By the way, this does seem to be one of the most addictive engineering hobbies I've every got involved in. Even more so than QRO DXing. I'm starting to wish I could drop it and get back to being a normal human being. Because, brothers, today I stopped at Lowes on the way home from work and picked up an 8" concrete form tube with every intention to chuck that up on my winder and cover it with wire. Ye gods.
Maybe I should join a coilers 12-step program or something.
Joe
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