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Re: [TCML] Proudly presenting My first coil
Phil, Mark,
Mark is using 12 spinning electrodes so his system is a "high break rate"
SRSG. Although it's more common for a SRSG system to be built to fire at 100
or 200 bps (low break rate), it is possible to use higher break rates. The higher
break rate is needed if the capacitors are small, to get sufficient power throughput.
It's always been my view that SRSG's don't offer much advantage over 200 or
240 bps, but still the higher break rate might offer somewhat smoother or steadier
operation compared to an async system.
With 12 spinning electrodes, the setting of the phase probably makes very little
difference to the operation of the coil. With 12 spinning electrodes, it's unlikely
that all of them can fire no matter how the phase is adjusted. On Mark's coil
it's possible that basically the gap might be firing on *every other* electrode
presentation. It might be skipping some firings all along.... again depending
on the capacitor size and motor rpm, etc. To me the sound sounds like about
maybe 400 bps or so? Even if a high bps SRSG fires on most of the electrode
presentations, it's likely that one or two that occur near the AC crossing of
the power line charging voltage will fail to fire... there won't be enough voltage
at that time to fire the gap. This will depend on gap spacing and many other
factors too.
In Mark's coil, I seem to hear a beat of about 1/2 second. I wonder if the
rotary is actually running at synch speed? Although I realize it's a proper
synch-type motor, the air-resistance loading of the rotor and electrodes may be
preventing the rotary from actually obtaining synch-speed? Mark did you
verify true sync operation using an o'scope locked to power line, or
a strobe of some sort?
In closing let me say that the coil runs very nice and smoothly overall, with
nice streamer behavior. Truly a very good job on your first coil !
Cheers,
John
-----Original Message-----
From: Philip <phil@xxxxxxxxxxx>
To: 'Tesla Coil Mailing List' <tesla@xxxxxxxxxx>
Sent: Sun, May 6, 2012 8:40 am
Subject: RE: [TCML] Proudly presenting My fist coil
Hello.
Nice streamers but it didn't seem to have the right sound for a synchronous
RSG. You tend to get more of a drone normally like this (skip intro)
http://www.youtube.com/watch?v=rZSiM7VeMjI If the phase was out it might
also account for the "not firing on all the electrodes" that you mention, as
the cap is not charged at presentation. What are you using for phase
control?
(Nice to see a 'classic' coil being built instead of SS) (Cd 942 caps would
improve things as well, and the coil seems worth the expense)
Phil
-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of SusaX2 X2
Sent: 05 May 2012 22:32
To: Tesla Coil Mailing List
Subject: [TCML] Proudly presenting My fist coil
Hi to all fellow TC enthusiasts!
Without further ado, I present to you, my first Tesla Coil:
http://www.youtube.com/watch?v=OJAVul8r7D8
very eager to hear your comments, remarks and or jokes about this one!
It's a genuine junk box coil, after watching the video, some might say it's
a coil in a pile of junk. No offence taken.
I'm a dutch mechanical engineer and slightly mad, so I guess I fit just
about in here.
I'm aware coiling is potentially very dangerous, I'm also aware coiling is
very possible.
About the coil:
The control box is plugged in a 3 phase wall socket, each fase is 220V and
16A. The power-on button actuates the 3 phase relay for the synchronous
spark gap induction motor, which is modified to salient pole operation at
3000 rpm. It has 1 pair of stationary electrodes and 12 flying brass
electrodes, but I don't think it fires on all of them.
For the power supply only 1 phase is used by the 6A Philips variac. Then I
connected an overdimensioned home made line filter, 48 uF PFC and a
ballast made from a demolished welder. This limits the current to 6,3A, so
the quad MOT stack doesn't melt my variac.
The capacitor is a SWC with 72 beerbottles, about 45 uF.
The primary is a copper ribbon pancake, tapped at the 7th turn.
The secondary is a 125mm PVC pipe with 830 turns of 21 AWG wire.
The top load is a 350x80mm and a 500x120mm toroid, both styrofoam with alu
tape and quite smooth. Best performance is with no breakout point.
RF-ground is a 3 meter steel pipe hammered into my back yard.
With the dual MOT stack, it produced 1 meter long sparks and a distinct
ozone smell. Now, with the quad MOT stack, sparks measure over 130cm and
the stench is more than alone ozone. It scrares the hell outta my wife, so
mission accomplished lol.
Greets from Holland,
Mark
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