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Re: [TCML] Lacquer
You wouldn't need to have the motor inside the vacuum. A larger pipe with endcaps and a vacuum fitting could be fitted over the freshly coated secondary. Both the vacuum pipe and the secondary could share the same shaft, which could be connected to the motor. Pump it down then spin it up.
Still, a lot of work.
--- On Thu, 4/8/10, Bill Noble <william_b_noble@xxxxxxx> wrote:
> From: Bill Noble <william_b_noble@xxxxxxx>
> Subject: Re: [TCML] Lacquer
> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> Date: Thursday, April 8, 2010, 2:20 PM
> if it just so happens that you have a
> container you can seal that will hold the coil and the
> mechanism to rotate it while the epoxy cures, and that it so
> happens that you have a vacuum pump, and you use grease with
> a low vapor point on the bearings of the motor, then you
> could get rid of the bubbles by drawing a vacuum - not a
> high vacuum - 20 to 25 inches would be fine
>
> --------------------------------------------------
> From: "Phillip Slawinski" <pslawinski@xxxxxxxxx>
> Sent: Thursday, April 08, 2010 10:18 AM
> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> Subject: Re: [TCML] Lacquer
>
> > Rob,
> >
> > Well, it took me a lot of practice to get results like
> that (and believe it
> > or not, I'm still not entirely satisfied with
> it). I use a plastic spreader
> > to apply the epoxy. On the first few coils I did
> I tried using a foam brush
> > (that's a BAD idea). I have a DC gear motor to
> spin the form. I have that
> > hooked to a variable DC supply and I can adjust the
> speed down to about four
> > RPM. It's important to apply the epoxy at a
> slightly higher speed than you
> > let it cure at. This ensures minimal
> dripping. After you ensure that the
> > epoxy is spread evenly over the form you can slow the
> speed down. I use a
> > heat gun to remove small bubbles from the
> finish. You have to experiment
> > with this, because if you heat up one spot too much it
> will bubble, or it
> > will become so runny that it drips off the form.
> One more important note:
> > you should do this in a low or preferably no traffic
> room. Be careful not
> > to move too quickly and stir up dust. If dust
> lands on the form during the
> > initial phase of curing it will make a dimple in the
> finish.
> >
> > -Phillip Slawinski
> >
> > On Thu, Apr 8, 2010 at 10:43, Rob Byron <mustang_5l87@xxxxxxxxxxx>
> wrote:
> >
> >> Phillip,
> >> How do you get your epoxy so crystal clear? I use
> a two-part epoxy ( not
> >> cheap stuff) and it allways ends up foggy looking
> because of microsopic
> >> bubbles. I use a 24h cure and have it set up on a
> rotating assembly with a
> >> microwave turntable motor. Is it how you mix it
> that matters? Or how you
> >> apply it? Your coils look amazing by the
> way!
> >>
> >> Rob.
> >>
> >> ________________________
> >>
> >> On 2010-04-08 09:33:32 -0600 Phillip Slawinski
> <pslawinski@xxxxxxxxx>
> >> wrote:
> >>
> >> >
> >> > Hi All,
> >> >
> >> > I too use the two-part epoxy coating on all
> my coils. I built a coil
> >> from
> >> > the ground up to produce a long spark length
> compared to the secondary
> >> > length. It has taken a lot of work, but
> I think the results were worth
> >> it.
> >> > http://www.flickr.com/photos/pslawinski/4354745760/ ;
> During the process
> >> of
> >> > developing this coil I have had multiple
> flash overs.
> >> > http://www.flickr.com/photos/pslawinski/4309814799/ ;
> I haven't lost a
> >> > secondary to a flash over or spark related
> event. My secondary is > wound
> >> > with 34 AWG on a 12" x 3.5" form. Not
> coating a form with such fine > wire
> >> is
> >> > simply not an option. The wire is very
> fragile, and will break with > only
> >> a
> >> > mild amount of force, also with wire this
> fine expansion and > contraction
> >> of
> >> > the form due to temperature change will cause
> the windings to loosen up
> >> and
> >> > fall down. Sadly, I know this from
> experience.
> >> >
> >> > -Phillip Slawinski
> >> >
> >> > On Thu, Apr 8, 2010 at 08:22, Peter Terren
> <pterren@xxxxxxxxxxxx>
> > wrote:
> >> >
> >> >> Firstly, the experiment with the
> conventional coil is not conclusive,
> >> >> sorry. Power was "about 20%" in the
> pre shot with racing sparks. No
> >> >> mention
> >> >> of actual values for the post shot and
> the sparks look very different >> on
> >> >> the
> >> >> pics.
> >> >> I am not saying the result is wrong, but
> it is highly likely the
> >> original
> >> >> power level was not reproduced.
> >> >>
> >> >> Secondly, DRSSTC's are different beasts
> in terms of coupling. >> Obtaining
> >> >> better Watt's ratios (spark length/sec
> length) seems a lot easier. >> 13:4
> >> =
> >> >> 3.25 does not seem remarkably efficient
> in this regard.
> >> >> On the other hand using an SGTC coil with
> no special insulation, I >> have
> >> >> Watt's ratios of 3.0
> (96inches/32in). Others have claimed larger >>
> ratios
> >> >> for
> >> >> SGTC's but I have not seen clear photos
> to show this. If you want to
> >> >> follow
> >> >> this link copy and paste it into your
> browser.
> >> >> http://tesladownunder.com/tesla_coil_sparks.htm#6 inch
> coil (the best
> >> >> ones)
> >> >>
> >> >> Nevertheless, the previous discussion of
> using ?Envirotex as a very
> >> thick
> >> >> layer does really seem to provide a lot
> of protection.
> >> >> Some years ago I started a TC project to
> dramatically outperform this
> >> 3.0
> >> >> Watts number. A lot of special
> fabrication was done and I still have
> >> >> everything ready to start some final
> plans and construction. One day
> >> when I
> >> >> have a few moments........
> >> >>
> >> >> Peter
> >> >>
> >> >>
> >> >>
> >> >>
> >> >> On 8/04/2010 1:16 PM, Dr.Hankenstein
> wrote:
> >> >>
> >> >>> Greetings,
> >> >>>
> >> >>> If you're not too sure on the effects
> of a good coating (or two or
> >> >>> three) of varnish; please refer to a
> scientific evaluation on the
> >> >>> following link:
> >> >>>
> >> >>> http://www.audiotesla.org/corona%20experiment.htm
> >> >>>
> >> >>> This should remove all doubt that
> varnish does more than just hold >>> the
> >> >>> winding in place and end the
> hypothetical armchair speculation. Dr.
> >> >>> Spark has at least 80 coats of
> varnish on "Fatboy"---13+ footers out >>> of
> >> >>> a 4 foot secondary proves it:
> >> http://www.drspark.org/fatboy1_rebuild.htm
> >> >>>
> >> >>> Regards,
> >> >>> Hank
> >> >>>
> >>
> >>> _______________________________________________
> >> >> Tesla mailing list
> >> >> Tesla@xxxxxxxxxx
> >> >> http://www.pupman.com/mailman/listinfo/tesla
> >> >>
> >> >
> _______________________________________________
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> >> >
> >>
> >> _______________________________________________
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> >>
> > _______________________________________________
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> >
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