[TCML] wooden bobbin

[Carl Noggle]

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.
>
> Ed
> 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.

---Carl




>
>> 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 
>> should
>> 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 
>> something
>> 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.
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>>
>>
>>
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