Both of mine were bombarder chokes, both home-made, and simply used a hose clamp, which really couldn't be used on the fly, but were quickly loosened, and adjusted.
________________________________
From: David Rieben <drieben@xxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Sent: Monday, February 17, 2014 10:16 AM
Subject: Re: [TCML] Making a slide choke.
Yes, the slide choke core will acquire the solenoid effect and with the level of power of medium to large sized SG driven Tesla coils, it's certainly not a force that one can manage with just "muscle power" :-) I once had a manufactured slide choke that was made to accomidated a 30 kV, 250 mA bombarder transformer and there was absolutely NO physically holding the sliding core from being completely pulled into the coil when energized! Of course the current throughput is minimal in this setup and current can only be incrementally increased by withdrawal of the core piece from the coil piece. The magnetic pull was just too strong to fight to try to slide the core piece out of the center of the coil. And the core had a nice handle built onto the end of it. I would also assume that the coil would also have to be very firmly secured fast to an unmovable surface to have any kind of manual control over the sliding core, which I never set up before selling
it to another coiler, IIRC.
Yurtle Turtle <yurtle_t@xxxxxxxxx> wrote:
>You'll need a method to keep the core where you want it, since it will want to go completely inside the windings. Depending on the power level, I was surprised at how much effort it took to adjust on the fly.
>
>
>
>
>________________________________
> From: Jason Johnson <jasonmsusolar@xxxxxxxxx>
>To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
>Sent: Monday, February 17, 2014 8:45 AM
>Subject: Re: [TCML] Making a slide choke.
>
>
>Round coil on square core is fine, though you'll have to use a bit more
>wire to get the same number of turns. You really only need enough clearance
>for the core to slide freely inside the coilform. Insulate the steel sheets
>from each other by spraying a bit of clear coat or varnish on them before
>assembly.
>
>Good luck and have fun!
>
>- Jason
>
>
>On Fri, Feb 14, 2014 at 11:13 PM, Caleb Thompson <calebriant777@xxxxxxxxx>wrote:
>
>> I am going to build a slide choke for my tc, but I have a few questions. I
>> have 500 ft of 10 awg thhn and a square core 2×2×16 made of 86 sheets of
>> steel. My question is, how much space needs to be between the core and the
>> coil? And can the coil be on pvc even though the core is square or should
>> the coil conform to the core? And input will help, thanks.
>> _______________________________________________
>> Tesla mailing list
>> Tesla@xxxxxxxxxx
>> http://www.pupman.com/mailman/listinfo/tesla
>>
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