> but how much time has been wasted now doing your fast winds and time
spent coating both? And cost of forms, wire, coatings?
My first wind was by hand and ~1000 turns of 28ga magnet wire on a 3.5" PVC
form. Came out terrible. I bought big spools of magnet wire from a supplier
and PVC from the hardware store, so that was probably $15 in materials all
totalled. Tried using liquid polyurethane varnish ($5) and that didn't work
as I liked it. $20 is really not much in my grand scheme of things - I
spent 4 times that much on capacitors.
Second wind was after I built a winding jig powered by cordless drill. Much
better, still has some obvious gaps in spacing. Same material cost. Used
spray varnish this time, has worked much better (less dripping, lighter
coats dry much faster).
I'm pretty sure I can eventually refine my winding jig to get me to wind an
excellent coil without much hassle. I've seen plenty of other people do it,
so it's certainly not an impossible problem. However, if I can find a
professional place to do it for reasonable cost, I'm more than willing to
have that done. There's a number of custom coil winding shops in my area.
If I continue to do my own I will likely change from PVC to some other
material - I've noticed the common PVC I can get may be slightly
out-of-round. G10 and FR4 are other options - I've used them for rocket
building.
Joshua Thomas
On Tue, Nov 23, 2021 at 9:17 PM Chris Reeland <chrisreeland@xxxxxxxxx>
wrote:
> Hi Joshua,
>
> Just one more thing on secondary winding...you are obviously again
> questioning your secondary...not to sound harsh about not having patience
> to hand wind, but how much time has been wasted now doing your fast winds
> and time spent coating both? And cost of forms, wire, coatings? Sounds like
> time and money already wasted and your still not getting your coil to run
> the way you would desire...
> Again not trying to be harsh here...just stating facts I can see here.
> But please do not get discouraged... keep at it...this is a learning
> experience after all... while trying to have fun.
>
> Chris Reeland
> Ladd Illinois USA
>
> Sent from my Lenovo Tablet
>
> On Tue, Nov 23, 2021, 8:07 PM Chris Reeland <chrisreeland@xxxxxxxxx>
> wrote:
>
>> Hi Joshua,
>>
>> Well, me I have some issues with how you have grounded now...you have a
>> case of the coil circuit using 2 grounds from what you are saying.
>> Hopefully some others will chime in soon and possibly agree with me.
>> Probably reopening this "can of worms" now...
>>
>> Me on my coil , I use RF ground on the NST.
>>
>> Can not really help on winding myself...too busy with so many things...
>> maybe someone here will volunteer at a decent price...and possibly not.
>> Some commercial offerings I have seen in the past is not cheap at all for
>> secondaries!
>>
>> Chris Reeland
>> Ladd Illinois USA
>>
>> Sent from my Lenovo Tablet
>>
>> On Tue, Nov 23, 2021, 7:52 PM Joshua Thomas <joshuafthomas@xxxxxxxxx>
>> wrote:
>>
>>> I haven't had the chance to change the wiring yet, but I have decided to
>>> have the NST grounded to mains earth. This seems to be the best option from
>>> among the available options.
>>>
>>> I've tried winding by hand and it was.... tedious. I may just lack the
>>> patience, but spending 4 hours carefully winding a coil is not my idea of a
>>> good time.
>>>
>>> > Your coil is running better with smaller toroid. Is this with all the
>>> primary tapped?
>>>
>>> I had adjusted the tapping several turns in when using the small toroid,
>>> based on some JavaTC calculations. It's hard to quantify how much longer
>>> the arcs were, but I would not say more than 10%. I need a function
>>> generator so that I can find the primary and secondary resonance
>>> frequencies, and adjust my tuning with better accuracy. Perhaps after
>>> Christmas....
>>>
>>> Joshua Thomas
>>>
>>>
>>> On Tue, Nov 23, 2021 at 8:08 PM Chris Reeland <chrisreeland@xxxxxxxxx>
>>> wrote:
>>>
>>>> Hi Joshua,
>>>>
>>>> You have not mentioned it...but I take it you corrected the NST
>>>> centered tapped RF ground issue?
>>>>
>>>> Can not really help you on toroid construction...it took me several
>>>> years to collect what I have in spun toroids on the used/NOS that I have
>>>> acquired at decent prices.
>>>> I can not ever justify buying direct brand new. They get extremely
>>>> expensive when getting large. I have been lucky on most of the prices I
>>>> have paid.
>>>>
>>>> On your secondary, I would suggest winding by hand... your secondary is
>>>> not really big at all...it doesn't take as long as you would think...just a
>>>> little patience.
>>>>
>>>> Your coil is running better with smaller toroid. Is this with all the
>>>> primary tapped?
>>>> If so, your bigger toroid does not work good because you are out of
>>>> primary tuning available.
>>>>
>>>> Chris Reeland
>>>> Ladd Illinois USA
>>>>
>>>> Sent from my Lenovo Tablet
>>>>
>>>> On Tue, Nov 23, 2021, 6:33 PM Joshua Thomas <joshuafthomas@xxxxxxxxx>
>>>> wrote:
>>>>
>>>>> Thank you!
>>>>>
>>>>> My topload is covered with copper foil. The base is dryer tube. While
>>>>> cheap, it is difficult to get a strongly smooth surface from it. I am
>>>>> jealous of those who can get the smooth spun-aluminum toroids.
>>>>>
>>>>> On the topic, can anyone recommend a service that will create secondary
>>>>> coils to specification? I am fairly bad at this and itâ??s one area I
>>>>> would
>>>>> be willing to spend a little money.
>>>>>
>>>>> Joshua Thomas
>>>>>
>>>>> On Tue, Nov 23, 2021 at 10:20 AM <pupman.com@xxxxxxxxxxxxxxxxxxx>
>>>>> wrote:
>>>>>
>>>>> > Hi Joshua,
>>>>> >
>>>>> > The arcs look and sound great in this video. They grow and move vs.
>>>>> > appear once and vanish. It does looks like there may be too many
>>>>> > breakout/sharp points on the toroid though, and lots of energy is
>>>>> being
>>>>> > lost. A light wrap of foil might smooth things out enough to allow
>>>>> > fewer, but longer and more developed streamers.
>>>>> >
>>>>> >
>>>>> > On 11/21/2021 4:03 PM, Joshua Thomas wrote:
>>>>> >
>>>>> > <content trimmed>
>>>>> > > These were used with 3 between each HV rail and RF ground. The
>>>>> caps
>>>>> > caught
>>>>> > > on fire after short use. You can see video of that event here:
>>>>> > > https://youtube.com/shorts/Sx_lHwjR_bs?feature=share
>>>>> > >
>>>>> > > (I should likely have shut this down sooner)
>>>>> > <content trimmed>
>>>>> > _______________________________________________
>>>>> > Tesla mailing list -- tcml@xxxxxxxxxxxxxxx
>>>>> > To unsubscribe send an email to tcml-leave@xxxxxxxxxxxxxxx
>>>>> >
>>>>> --
>>>>> Joshua Thomas
>>>>>
>>>>> My new email address is: joshuafthomas@xxxxxxxxx
>>>>> Please update your information if you have not already done so.
>>>>> _______________________________________________
>>>>> Tesla mailing list -- tcml@xxxxxxxxxxxxxxx
>>>>> To unsubscribe send an email to tcml-leave@xxxxxxxxxxxxxxx
>>>>>
>>>>
>>>
>>> --
>>> Joshua Thomas
>>>
>>> My new email address is: joshuafthomas@xxxxxxxxx
>>> Please update your information if you have not already done so.
>>>
>>
--
Joshua Thomas
My new email address is: joshuafthomas@xxxxxxxxx
Please update your information if you have not already done so.