[TCML] wooden bobbin
cn at q.com
Sun Nov 20 07:43:34 MST 2011
On 11/19/2011 2:25 PM, Ed Phillips wrote:
> I've used wood a lot although your application probably requires it to
> be pretty thin. Before cutting the piece to be worked is placed in a
> pan full of melted paraffin was whose temperature is almost hot enough
> to scorch it. Air and probably steam bubbles out for a while but when
> that stops the wood seems to be pretty well impregnated and ready for
> use. The reason this is done before shaping is because the stuff
> usually shrinks significantly and can possibly warp. The wood is
> removed from the pan and suspended to allow the excess paraffin to
> drain off. After it cools is seems more solid and easier to work.
> This is a very very dangerous process because of the possibility of
> igniting the paraffin but I've never had any problems. Keep a fire
> extinguisher on hand 'just in case'. I should mention I've used this
> as a base for RF coils with no apparent increase in loss.
> Hi, Scott,
I have some 2" diameter nylon rod--if you want a foot or so, I'll send
it to you. Contact me off-list.
>> Hey all,
>> Still doing some research on making flyback transformers, I'm toying
>> with the idea of making a slotted bobbin to make a series pancake type
>> secondary, as it sound infinitely easier to wind, and I plan on making
>> several... My question is can I use wood as a bobbin material, it
>> be fairly easy to machine to my shape, and much cheaper than plastic,
>> and I
>> figure it can just be soaked in wax or polyurethane or epoxy or
>> to provide protection from the corona of the windings... Probably a bad
>> idea, but what do you guys think, using wood in a transformer,
>> royally bad
>> idea or no?
>> Scott Bogard.
>> Tesla mailing list
>> Tesla at pupman.com
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