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Registered Member #7267
Joined: Tue Oct 16 2012, 12:16AM
Location: Detroit, Michigan
Posts: 407
as quoted from your link "If you make a primary from 0.25 inch coppper tubing with 0.25 inch spacing and a 9.3 nf capacitor you will be in tune at about turn 9 or 10(with a 12kV 30ma NST)."
So what don't you get how to do? whatever your supports are, either drill a 3/8" hole or 1/4" notch every half inch and thats it. From that you have 1/4" primary with 1/4" spacing between turns...
Registered Member #3768
Joined: Tue Mar 22 2011, 12:46AM
Location:
Posts: 107
That is the thing, I need to know how to do that properly, when I put the marks 0.25 inches from each other then go to drill a 0.25-3/8 inch hole the spacing is no longer 0.25 inches. Get what I am saying?
Registered Member #7267
Joined: Tue Oct 16 2012, 12:16AM
Location: Detroit, Michigan
Posts: 407
the mad scientist wrote ...
That is the thing, I need to know how to do that properly, when I put the marks 0.25 inches from each other then go to drill a 0.25-3/8 inch hole the spacing is no longer 0.25 inches. Get what I am saying?
yes. 1/4" spacing means 1/4 between the turns, not where you drill holes. distance between the center point for where you drill 3/8" hole will be half an inch. 1/2" minus 1/4" tubing = 1/4 spacing between turns.
EDIT:
Does this help? Use 3/8" drill bit as you might find trouble trying to slide 1/4" tubing through 1/4" holes. The dimensions will work out the same and you will have an average of about .22" spacing between turns but that hardly makes a difference.
Registered Member #7267
Joined: Tue Oct 16 2012, 12:16AM
Location: Detroit, Michigan
Posts: 407
If you do notches you can probably do 1/4" and snap the primary into the notch. If they still dont fit just take a circular file and file the notches till they fit in snug. But making the notches 3/8" is no problem either..
Registered Member #9020
Joined: Wed Dec 26 2012, 12:11AM
Location:
Posts: 4
the mad scientist,
I've tried a modification of Greg's cable tie method with refrigerator tubing on my toolbox Tesla (a coil designed from the start to be likely to fit in a typical toolbox). It was easy to construct and the cable ties provided approximately the right spacing for 1/4" copper tubing (which is already in a pancake coil shape).
The general rule of thumb I've encountered is turn spacing should be roughly wire diameter.
Strangely because I don't play any musical instruments which need me to tune them, I tune my coil by ear and by looking at the sparks. If the sparks and the noise please me, I am happy with my work (whether or not it's actually properly tuned). It's just a choice to be qualitative rather than quantitative once the coil is on the workbench almost all done.
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Tuning a primary coil.
