I shared your distaste at the thought of hand winding something like a secondary. When I did mine, I took a piece of ready rod, a couple of pieces of wood big enough to span the end of the form, a crank, and two saw horses. A couple of nails in the saw horse to run the ready rod in and spaced them far enough apart to run the secondary form between them. I enlisted my daughter to turn the crank and count and I fed the wire. I was very pleasantly surprised to find how easy and quick it was to wind. At even one turn per second that is 3600 turns per hour and it goes a lot faster than one a second. Another advantage is that the person paying the wire can brush on polyurethane at the same time if you want the wire truly bedded in poly or varnish.
Brian
-----Original Message-----
From: Joshua Thomas [mailto:joshuafthomas@xxxxxxxxx]
Sent: Tuesday, November 23, 2021 5:52 PM
To: Chris Reeland
Cc: tcml@xxxxxxxxxxxxxxx
Subject: [TCML] Re: Terry/lowpass filter design, OBIT
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>
>> > _______________________________________________
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>> > 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.
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