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Registered Member #103
Joined: Thu Feb 09 2006, 08:16PM
Location: Derby, UK
Posts: 845
It's coming on really nicely, good work!
I remember using one of those hot wire plexi benders at school, problem is the heating wire was way too far down - about 4" from the plexi, and I was never able to get good results. I might have to build one like yours and try it again!
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Hi avalanche
Wire is 3-4mm away from plexi on mine, andI actually toughtto bring t closer, but wasn't bothered to find longer screws (these were already becoming unstable).
Wire shouldn't be too hot but should almoust touch acrilyc for best results.
26.1.07: cut primary supports, and added a pic. They aren't looking too good...
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Hi again.. Updated with some new pics.
One thing that bothers me... C. hooper pointed out steel screws I used on my primary supports.
They are chrome-nickel stainless steel and they don't seem to be noticeably magnetic. Should I worry about these setting my coil on fire? (plexi wouldn't like to get hot at all.)
I used to have lots of ferrous things around my primary, sometimes even big plates or connection clips and didn't have any trouble...
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
'evening.. Pics of almost finished coil finally! Just have to get some more wiring soldered and hooked up, and I hope for a first light tomorrow.
I also remembered I have an large amount of ceramic caps, in one of old MMC's, laying unused. They aren't best choice, but still much better than few polyester caps .
Each capacitor is rated 10nF 3kV, and I have 25 strings of 2 in series for 6kV 125nF, surge impedance ~10ohms. I didn't have enough bleeders for them all, so I just used two seris resistors over entire bank.. hope they won't care!
Since there's so many of them, each cap would suffer only 20 amps of peak current if I ran the coil at full 500amps.. with some luck I may get some bigger sparks with them!
Only thing I'm afraid for them is that they'l start to heat up due to losses, and detune the coil all the time due to their gross C/t dependence. Current and frequency are low so I may have some chance.
PS. 26.2. hope to continue this as soon as possible..
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Marko's DRSSTC v1.1
