Author Topic: My 4.25" coil so far  (Read 244 times)

Offline Bradselph

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My 4.25" coil so far
« on: May 01, 2020, 08:38:38 PM »
figured id share what i been wrecking havoc with for the last 6+ months  ;D :o 8)

47" strike to grounded target without breakout point



its a 4.25" secondary wound with #22 awg wire 24" winding had enough wire for a 6" form but i wasn't sure about what material to use and until this week this project has only cost the wire and a harbor freight grinder on sale for $9.99  ;D its been hit by a streamer and still kicking

but the money spending as just got serious as Ive purchased 3 x 12kv 60ma NSTs looking for a 4th one still and working on trying to move away from the bottle caps but these things are just ridiculously bullet proof so far Ive only cracked 1 and it was caused by a rogue wire creating a hot spot

Ive had a lot of trial and error with just about every part possible

so far Ive tried too many different type of spark gaps and only 1 has impressed me and actually survived my abuse and that has been the angle grinder its even exploded from a brass electrode deciding it wanted to leave at over 200mph luckily i had enclosed the rotor with 1/2" MDF board so when things went south the wood did its job and stopped deadly projectiles at the cost of itself

Ive also been working on a synchronous motor with a 11" disc and i finally got it to impress me enough to start improving it and get it to actually be "synchronous" since i rushed assembly on it it surges too much but i can get it to lock on by pulsing the power switch for it a couple times so its a lot quieter than the angle grinder and until i tweaked it a little bit i wasn't impressed with it at all almost tossed it until it randomly got in time i guess and started almost matching the spark length of the grinder and it peaked my interest enough that I'm gonna rebuild it the right way and not rush it

my biggest gain in spark length was when i decided to add add 4 more flying electrodes to the grinder for a total of 8 and a large 3/8" aluminum diamond plate under the coil to act as a counterpoise to see if it would help with grounding since the sandy soil is most likely not the best even though i soak the area near the ground rod about 30 minutes before a run
« Last Edit: May 01, 2020, 08:41:27 PM by Bradselph »

Offline MRMILSTAR

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Re: My 4.25" coil so far
« Reply #1 on: May 01, 2020, 10:47:09 PM »
Nice results. I will say that of all the components of a SGTC the one part that can't be rushed in building is the SRSG. It must be built carefully and done right or else performance will be poor and/or dangerous.
Steve White
Cedar Rapids, Iowa
Retired electrical engineer

Offline Bradselph

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Re: My 4.25" coil so far
« Reply #2 on: May 02, 2020, 10:45:06 PM »
I’ve removed a little more material from the rotor and got the motor to sync better now and it seems to hold it without the surging and beating like before so now I have to make a better mount to hold the assembly then try it out if weather permits

As many have said before and I quickly realized as well it will rain every time I plan to setup for a run 😄

Offline MRMILSTAR

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Re: My 4.25" coil so far
« Reply #3 on: May 02, 2020, 11:09:02 PM »
Outdoor operation can be a big nuisance however if you want to produce the big streamers, outdoors is where you have to be unless you're one of those lucky people with a big pole barn. I'm not.

My 6.5 KVA SGTC with 9-foot streamers is outdoor operation only. It takes me about 15 minutes to set it up.
Steve White
Cedar Rapids, Iowa
Retired electrical engineer

Offline Bradselph

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Re: My 4.25" coil so far
« Reply #4 on: May 02, 2020, 11:30:23 PM »
Well I have the pole barn but sadly it’s full of junk 🤣

I’ve thought about adding a precisely placed air vent to my grinder box to help with airflow over the spark gap somehow I may try some other enclosure for it as when I added more power to it by making my own transformers I get a lot of trailing arcs that sound like a sputtering jet engine having a bad day

And it clearly effects the quenching and spark length

It used to take me about 30 minutes to 45 minutes to setup when I first started experimenting with it but after several rainouts I started makings everything modular and now it takes about 10 minutes to setup and go
The biggest problem is the beer bottle caps and best solution I found was milk crates they hold 25 bottles each and are 12”x12” but quick connections on them made it simple to add or remove a crate

Offline Bradselph

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Re: My 4.25" coil so far
« Reply #5 on: May 06, 2020, 12:38:56 PM »
Well i made i decided to wire it up to 240v instead of 120. now past few times ive done this has lead to almost instant death of the transformers almost every time.

i think i figured out why and have corrected my mistakes and now i made it to 4' i tried for a bit longer but dew started to settle and the safety gap would arc and not stop unless i powered it off at first i thought i had another failure but it was just the safety gap arcing a flame

now after several longer runs maybe 2+ minutes the transformers need cooling and i actually popped a beerbottle cap  ;D

« Last Edit: May 06, 2020, 12:40:37 PM by Bradselph »

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Re: My 4.25" coil so far
« Reply #5 on: May 06, 2020, 12:38:56 PM »

 


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