Is there any reason besides difficulty to use a cardboard tube or other
material as an arbor and use fiberglass fabric and epoxy Resin to make a
form?
On Thu, May 19, 2022, 6:00 PM <pupman.com@xxxxxxxxxxxxxxxxxxx> wrote:
> US plastics sells extruded 4" OD acrylic at $71.58 for a 6 foot piece,
> which isn't too bad. A local plastics supply house if you have one can
> chop it up if they have it in stock. 24" might fall into the scrap
> category too.
>
> Acrylic is pretty, and solvent welds nicely. It's free of compounding
> agents that leak out too.
>
>
>
> On Thu, 19 May 2022, Joshua Thomas wrote:
>
> > " It can be noticed that PVC isn't used in the electrical industry
> outside
> > of low voltage wire insulation. It's not a great choice, especially for
> > high voltage applications. We just use is as it's good enough, and at
> > least in north america, very available, and at a reasonable price as it's
> > the cheapest of all plastics."
> >
> > No kidding! I tried pricing 4.00" OD acrylic and polycarbonate - yikes!
> 24
> > inches of acrylic was over $225.
> >
> > On Thu, May 19, 2022 at 9:12 AM <pupman.com@xxxxxxxxxxxxxxxxxxx> wrote:
> >
> >> In general, PVC cannot be epoxied.
> >>
> >> There is nothing wrong with mechanical fasteners on a PVC pipe. Anybody
> >> with internal arcing on the inside of secondary is doing something else
> >> wrong. The voltage at the bottom of the secondary is zero. There is no
> >> reason to overcomplicate something as simple as a binding post.
> >>
> >> PVC pipes are not clean when you buy them.
> >>
> >> Wash and scrub them, including the bore before use. You don't know what
> >> release agents or plasticizers are on those surfaces. PVC pipes (or
> >> anything made of "PVC") is a complex mix of additives as pure PVC is
> >> completely useless as a final product.
> >>
> >> It can be noticed that PVC isn't used in the electrical industry outside
> >> of low voltage wire insulation. It's not a great choice, especially for
> >> high voltage applications. We just use is as it's good enough, and at
> >> least in north america, very available, and at a reasonable price as
> it's
> >> the cheapest of all plastics.
> >>
> >>
> >> On Wed, 18 May 2022, Joshua Thomas wrote:
> >>
> >>> Hi Jim,
> >>>
> >>> It looked to be the copper side that failed. I had cleaned both
> surfaces
> >>> with isopropyl before using the epoxy; perhaps I needed to wait a bit
> >> long
> >>> for the iso to clear up.
> >>>
> >>> I really not have had any great results trying to use epoxy (Bob Smith
> >>> brand, in this case) with plastic surfaces; but most of my epoxy
> >> experience
> >>> is with amateur rocketry, which uses material like phenolic and woods.
> >>>
> >>> Joshua Thomas
> >>>
> >>>
> >>>
> >>> On Wed, May 18, 2022 at 8:14 PM Lux, Jim <jim@xxxxxxxxxxxxx> wrote:
> >>>
> >>>> On 5/18/22 4:43 PM, Joshua Thomas wrote:
> >>>>> Hello Mads,
> >>>>>
> >>>>> Thank you for reminding me of your site, I had used it before as a
> >>>>> reference. I have been sticking to the ?rules? of not putting any
> holes
> >>>> in
> >>>>> the secondary, but I see you?ve gotten away with it on occasion. I
> >> might
> >>>>> try using a nylon bolt threaded from the inside to outside as a place
> >> to
> >>>>> terminate the bottom of the coil.
> >>>>>
> >>>>> On that note, do you have any recommendations for adhesives for
> >>>>> plastic-plastic (pvc) and metal-plastic bonding? The epoxy I used to
> >>>> hold a
> >>>>> piece of copper to a pvc pipe was a complete failure.
> >>>>
> >>>> Which side of the joint failed? The copper or the PVC? You have to be
> >>>> scrupulously clean.
> >>>>
> >>>> I use silicone sealer (like for tubs or aquariums) for a general
> purpose
> >>>> "glue" - it sticks to most stuff pretty well. It's not good
> >>>> structurally, but for something that's not seeing a lot of loads it
> >>>> works ok - good epoxy joints are stronger than the material in some
> >> cases.
> >>>>
> >>>>
> >>>> _______________________________________________
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> >>>>
> >>> --
> >>> 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
> >> _______________________________________________
> >> 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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>