Just wanted to post an update. I increased the number of electrodes from 3
to 5. The sparks are longer, but still not quite what I was expecting for a
coil this large. I am thinking of increasing the number of electrodes again
to something like 7. Is this a good idea given the results I just observed?
Here <https://www.youtube.com/watch?v=718hnoMDuEQ> is the coil at its most
recent test.
-Kuba Anglin
On Thu, Feb 26, 2015 at 1:56 PM, Terry L <terry@xxxxxxxxxx> wrote:
> Hard to tell from the photo but your rotary spark gap clearance, between
> the fixed electrode and the rotary electrode, looks too wide. This gap
> clearance when electrode align should be tight. I run my at about 10
> thousand of an inch maximum. Again, I am looking at a photo and could be
> seeing this wrong.
> Terry L.
>
>
> On 2/26/2015 4:29 AM, Mark Olson wrote:
>
>> Bps too low?
>> Is strike rail grounded?
>>
>> kc5gym@xxxxxxx
>>
>> On 02/26/2015 12:30 AM, Kuba Anglin wrote:
>>
>>> Hello,
>>> I recently finished building my second Tesla coil.
>>> Here are the specs:
>>>
>>>
>>> - 2 parallel 12KV 60mA neon sign transformers 12KV 120MA
>>> - 2000V .15uf capacitors. 6 strings of 13 (78 total). 69nf.
>>> - Rotary spark gap 1780rpm with 3 tungsten electrodes.
>>> - Resonant frequency: around 110KHz
>>> - 1/4" primary coil (tubing) 10 turns, 7.5 turns for optimal spark.
>>> - 24 AWG secondary. 6" form (6.625"). 1240 turns. 30" wind height.
>>> - 24"x6" Spun Al toroid
>>>
>>> After firing up the coil, I was disappointed to see only 1-2' sparks. My
>>> previous 4" coil that uses only one transformer could output about 3'
>>> sparks. The primary is properly tuned and the spark gap fires about 80
>>> times per second as it should. I double-checked the wiring and it looks
>>> great. I must be missing something, but I cannot figure it out. I 3D
>>> printed the primary standoffs to perfectly hold the primary coil. The
>>> secondary coil is perfectly wound and glazed. The transformers are fully
>>> functional. The whole coil should operate at around 1800 watts (including
>>> the motor). Here are some links to pictures of the coil: Tesla coil
>>> <http://s11.postimg.org/50b6jpg6r/Large_Tesla_coil.jpg>, Spark Gap
>>> <http://s1.postimg.org/xfowkeppr/Spark_gap.jpg>. Here is a video of the
>>> first run: Test <https://www.youtube.com/watch?v=n5gSaWPfZH4>.
>>>
>>> Any feedback would be greatly appreciated.
>>>
>>> Thanks,
>>> Kuba Anglin
>>> _______________________________________________
>>> Tesla mailing list
>>> Tesla@xxxxxxxxxx
>>> http://www.pupman.com/mailman/listinfo/tesla
>>>
>>>
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