Re: [TCML] New Coil

[Yurtle Turtle <yurtle_t@xxxxxxxxx>]

Also, be sure to use the help "?" for each parameter, which gives a great description and illustrations on what these values mean graphically. For instance, the primary coil inner diameter is variable. Think about it. It's a spiral. Also, if you're using 1/4" tubing, whether you measure inside to inside or center to center make a big difference.

Adam

--- On Thu, 3/11/10, bartb <bartb@xxxxxxxxxxxxxxxx> wrote:

> From: bartb <bartb@xxxxxxxxxxxxxxxx>
> Subject: Re: [TCML] New Coil
> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> Date: Thursday, March 11, 2010, 8:47 PM
> Hi Miles,
> 
> It's not too difficult really. Note that Javatc gives a
> "minimum" proximity between coils. This value (minimum
> proximity) is determined by the ability of voltage breakdown
> between coils and therefore requires a transformer input to
> be calculated. It is wise to add 1/4" to 1/2" above this
> value. There is no rule on a 2" gap (simply an empirical
> recommendation that is sometimes too wide and sometimes too
> narrow). I prefer to calculate it, but note that most coils
> will be in the 1.5" to 2" range regardless.
> 
> In any event, if you see that the minimum proximity is for
> example 1.5", then set your primary diameter to accommodate
> this value plus say 1/4" (primary radius = 1.75 + sec
> radius).
> 
> Now, if you desire a 0.14 coupling and your primary ends up
> below sec bottom turn, then you need to increase the inner
> diameter of the primary to attain that. For a reality check,
> realize that primary coils can be adjusted below, right at
> the sec bottom turn, or even above the bottom turn. It's
> placement is preferred to be even or below the secondary
> bottom turn (since the voltage across the secondary
> increases with turns). However, coupling is rather important
> for decent performance. You might be surprised at how many
> coilers pay little or no attention to these guidelines and
> still end up with great running coils.
> 
> Hope that helps,
> 
> Bart
> 
> Miles Mauldin wrote:
> > Hi Bart,
> >  Am I using the tool incorrectly then?  You
> are right, it does not output any diameters, those are
> inputs.  I am questioning the values I had to input to
> arrive at a coupling of .14k.  I do not believe I have
> seen any photos of a coil design that had the bottom
> windings of the secondary below the plane of a flat
> primary.  Also every other tool I've used, and research
> I've done, suggests the inner diameter of the primary be at
> least 2" greater than the outer diameter of the secondary
> form.  I am just guessing I'm not using the tool
> correctly.  Any guidance would be appreciated.
> >  Thanks,
> > Miles
> > 
> > 
> > 
> > ________________________________
> > From: bartb <bartb@xxxxxxxxxxxxxxxx>
> > To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
> > Sent: Wed, March 10, 2010 8:29:09 PM
> > Subject: Re: [TCML] New Coil
> > 
> > Miles,
> > 
> > The recommended minimum proximity in Javatc is
> calculating the distance as the "nearest points" as noted in
> the help file. If Javatc tells you 1.5" as the minimum
> proximity, then it's looking for a primary diameter that
> meets this distance. Javatc does not suggest a primary
> diameter in any of it's outputs.
> > 
> > Take care,
> > Bart
> > 
> > Miles Mauldin wrote:
> >   
> >> Could that really be correct?  Using the
> javatc tool it suggests my primary inner diameter to be only
> 1.5" greater than the secondary form (a difference of .75"
> radius), and to obtain .14k coupling the lower end of the
> secondary is .5" below the primary.  I worry when the
> primary and secondary is that close; should I?
> >> 
> >> 
> >> 
> >> 
> >> ________________________________
> >> From: John Forcina <forcijo10@xxxxxxxxx>
> >> To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
> >> Sent: Mon, March 8, 2010 1:22:52 PM
> >> Subject: Re: [TCML] New Coil
> >> 
> >> If i read correctly in this photo,
> >> http://www.cmnow.com/TeslaMan/Toroid/tn1.htm You plan
> to have your primary
> >> coil 4" That is going to be way too low and your
> coupling between your
> >> primary and secondary coils will be very small
> allowing very little energy
> >> transfer into the secondary coil.  I
> recommend you plug your coil specs into
> >> Javatc http://www.classictesla.com/java/javatc.html . 
> Adjust your primary
> >> height and diameter and adjust your primary
> coupling to about K=.14
> >> 
> >> On Mon, Mar 8, 2010 at 12:58 PM, DC Cox <resonance@xxxxxxxxxxxx>
> wrote:
> >>   
> >>     
> > _______________________________________________
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> >   
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> 



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