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Registered Member #316
Joined: Mon Mar 13 2006, 01:30PM
Location: Marietta, GA
Posts: 212
You really should seal the ends of the pipe, especially if you will be arcing farther than the length of the secondary. Otherwise you can get an arc inside which will cause a carbon track and ruin your secondary. Also, you must be absolutely sure that your ground connections, wires, bolts, etc. do not run inside the base of your secondary.
Registered Member #316
Joined: Mon Mar 13 2006, 01:30PM
Location: Marietta, GA
Posts: 212
Lexan would be good, but just about any plastic will work as long as it isn't black. I usually use silicon to attach the disc to the end (you really only need to do the top) since it insulates well and fills all the cracks.
Registered Member #79
Joined: Thu Feb 09 2006, 11:35AM
Location: Arkansas
Posts: 673
Huh. I never thought about sealing the end of the secondary to protect it, I just did it because I had to. I have accomplished 2.5x secondary spark length with 3/4" plywood sealing the ends and no problems at all. That was 50" with a 20" secondary. I'll bet plexiglass would work just fine if lexan is too expensive.
They're seroius about not letting wires and bolts extend down in the secondary. This happened to one of my first coils because I let the secondary wire hang down in the tube.
BTW, vasil meant that a rounded rotor would be safer. I agree.
Registered Member #341
Joined: Thu Mar 23 2006, 07:41PM
Location: Northern Illinois, USA
Posts: 69
I have read on other threads about the shortcomings of having the wires on the end of the secondary inside of the form and the need to seal the ends of the form. I have never sealed the ends other than having a piece of plywood covering the top and the bottom setting on a glass MO tray. I’m new to building coils, but I can’t understand why fresh air would be our enemy
As you can see, I don’t leave much wire inside the coil, enough to get the job done with a little slack. And even with my salt water/wine bottle cap. I routinely make streamers that are twice the length of the secondary and have never had a problem. Maybe I’ve just been lucky.
Registered Member #341
Joined: Thu Mar 23 2006, 07:41PM
Location: Northern Illinois, USA
Posts: 69
I have read on other threads about the shortcomings of having the wires on the end of the secondary inside of the form and the need to seal the ends of the form. I have never sealed the ends other than having a piece of plywood covering the top and the bottom setting on a glass MO tray. I’m new to building coils, but I can’t understand why fresh air would be our enemy
As you can see, I don’t leave much wire inside the coil, enough to get the job done with a little slack. And even with my salt water/wine bottle cap. I routinely make streamers that are twice the length of the secondary and have never had a problem. Maybe I’ve just been lucky.
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
I would say you should be ok. Although cracked tar might be a sign of prevoius abuse
I am not sure it the second pic is supposed to be showing the weld (which is normal) of just the tar, but it looks ok to me. At the top the tar isn't really important, it just needs to protect arround the hv secondaries...
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Questions regarding variacs & protection
