Re: mdpe tubing for secondary form

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>

Hi,

Poly shipping wrap film is maybe suggested here.  That stretch wrap that
they use to wrap up a bunch of shipping items in is very dielectric and
very cheap.  I use it in my OLTC and my "new" SSTC secondary.  Any office
store sells it cheap.

Also, wind the wire "tight" on the form!!  Not much "spring" to copper but
get watcha can ;-))

Cheers,

	Terry


At 09:59 PM 10/23/2002 -0700, you wrote:
>Justin -
>
>Aside from securing the magnet wire to the form, your biggest problem may be
>the very large coefficient of thermal expansion of polyethylene. If your
>secondary will spend its life indoors at room temperature only, its probably
>not an issue. If it will be exposed to either high or low temperatures, you
>may find the windings sliding loose on the form, especially if they are not
>somehow bonded to the form. If the form cools, it will shrink substantially
>and the windings will slip. If it gets hot, it may stretch the wire as it
>expands, and again your wire may end up loose after everything returns to
>room temp.
>
>Its certainly worth trying a PE form, but if you calculate the change in
>diameter of an 8" form over a 40 degree F temperature range you'll see what
>I mean.
>
>Regards,
>Scott Hanson
>----- Original Message -----
>From: "Tesla list" <tesla-at-pupman-dot-com>
>To: <tesla-at-pupman-dot-com>
>Sent: Wednesday, October 23, 2002 7:40 PM
>Subject: mdpe tubing for secondary form
>
>
>> Original poster: "Justin Wright by way of Terry Fritz
><twftesla-at-qwest-dot-net>" <justin-at-tracesofnut-dot-com>
>>
>> Hello All,
>>
>> I have found a source of MDPE tubing (thanks to Mark Finnis).  The
>> tubing they have is 200mm (8") but the walls are 8-9mm thick.
>>
>> I have heard that the thickness of the tubing will affect the
>> performance of the coil?
>>
>> Is this thickness going to be a problem?
>>
>>
>>
>> Regards
>>
>> Justin.
>>
>>
>>
>>
>>
>>
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