[Lowfer] LF Coil Form

[Pat Bunn]

The Tesla coil guys don't like them because the arc. The only way to dry them out is to strip them of the wax impregnation and then dry them and then use electrical varnish in multiple coats. 

PVC tube is lighter and easier to work with.  Some say varnished wood is better than PVC.

Pat
N4LTA

Sent from my iPhone

On Feb 9, 2014, at 7:54 PM, Michael Sapp <wa3tts at verizon.net> wrote:

> Stan & All:  Those compressed cardboard "sonotubes" are popular for telescope building. Might be some useful
> info in the home scope builder domain for resin coating them.... that's all nasty chemicals tho, for $100 or so it's worth finding a tube section ready to go.... Mike wa3tts
> 
> 
> ----- Original Message ----- From: "stan, W1LE" <stanw1le at verizon.net>
> To: "Discussion of the Lowfer (US, European, &amp; UK) and MedFer bands" <lowfer at mailman.qth.net>
> Sent: Sunday, February 09, 2014 6:26 PM
> Subject: Re: [Lowfer] LF Coil Form
> 
> 
>> The round concrete form for footings is a good alternative from Home Depot.
>> Mine is 12.5" OD with 1/8" wall.   Buy the length you need in 4' increments.
>> 
>> It looks like compressed fiberboard, but I know that it disintegrates out in the weather,
>> but it matters not, because by then the concrete is hard.
>> 
>> My thought is to wind the coil, then give it a coat or fiberglass resin for a little waterproofing.
>> 
>> Other possibilities are a 55 gallon white plastic drum with straight sides or the 190 liter pickle barrels.
>> I would avoid any colored barrels, like black, because of the pigmentation may effect electrical performance, maybe.
>> These UN rated plastic barrels are very durable and have lasted for years in their outside storage role.
>> 
>> I got my 55 gallon barrels for yard waste from a used barrel dealer.
>> 
>> Stan, W1LE     Cape Cod
>> 
>> 
>> 
>> On 09-Feb-14 4:08 PM, Peter Barick wrote:
>>> OUCH, Old boy! Only $100?? ;~)
>>>  Locally I've picked up scrap green sewer pipe from street work around town (only after hours). Always have remnants of those jobs. Last one was about 5 ft by 18 inches. Also found a 3 foot D pvc drum (no metal rings) that a business discarded full of trash. I emptied it for them. And I have a smaller 18 inch white pvc
>>> bucket w/ straight sides, another discard.
>>>  Has anyone noticed the cement formers sold in home inprove stores? They are hardened fiber and I believe up to 2 feet in D. And scant few bucks!
>>>  Cheers, Peter, Illinois
>>> ---------------------------------------
>>>>>> pbunn <pbunn at matrixei.com> 02/07/14 8:28 AM >>>
>>> Just a FYI
>>> 
>>> I have been searching for quite a while for a reasonably priced coil form for 137 and 75 KHz. It ended up being right under my nose.
>>> 
>>> Harrison Superduct - Plastic duct is available in many sizes up to 60" diameter. I just bought a 36" long 16 " OD section for just over 100 bucks. That may sound expensive but compared to Schedule 40 or 80 pipe it is cheap. It is made of PVC and is thin wall duct. They take credit cards and will ship UPS but the plant is about 30 miles from here in Clover, SC and I can pick it up.
>>> 
>>> Pat
>>> WG2XLP
>>> WG2XCT
>>> N4LTA
>>> 
>>> 
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