Re: Mounting a Secondary

To: tesla-at-pupman-dot-com
Subject: Re: Mounting a Secondary
From: "Dr. Resonance" <Dr.Resonance-at-next-wave-dot-net> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
Date: Thu, 06 Jan 2000 17:26:54 -0700
Approved: twftesla-at-uswest-dot-net
Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme


Cut a piece of 3/4 plywood to friction fit into the ends of the coilform.
Then tap into the form until the ends are even.  Next, drill and tap for
10-24 machine screw.  Mark with piece of tape to retain alignment for
reassembly. The threads in the wood seem to hold fine as long as you are not
assembling and disassembling the coil more than 3-4 times in it's lifetime.
Don't overtighten.

Disassemble and blow out with compressed air.  Attach your 1/4 inch dia
brass feedthrus and reassemble.  Use 10-24 plastic (nylon) machine screws to
hold end in place.  With a 4 inch dia tube 4 screws are adequate.  With a
larger tube such as 10-12 inch use 8-12 machine screws (always nylon --
never metal).  Protection your tube interior with a pair of 1/4 inch acrylic
disks fitted approx 3 inches up each end of tube.  Secure in place with GE
silicone II calking (clear type).

The lower brass feedthru goes through your wood base assembly and then a
brass nut holds it in place.  We usually make a plastic washer 4-5 inch dia
also on the lower side to help distribute the clamping forces over the wood
area so as to not chip it.The brass feedthrus are made by threading each end
of cut to length brass rod --- available from any metal supplier in your
area.

Regards,

Dr. Resonance



-----Original Message-----
From: Tesla List <tesla-at-pupman-dot-com>
To: tesla-at-pupman-dot-com <tesla-at-pupman-dot-com>
Date: Thursday, January 06, 2000 12:00 PM
Subject: Mounting a Secondary


>Original Poster: Ted Rosenberg <TRosen1-at-Tandy-dot-com>
>
>My thanks to all for several good and innovative secondary mounting ideas.
>Ted
>=================
>
>Original Poster: "Andy Cleary" <gemware2-at-dreamscape-dot-com>
>
> On my smaller 4" coil I used a form of friction fit, adjustable coil
>coupling.  I took a same-size piece of PVC drain tubing, and cut about 1/8"
>down one side, to make it slightly smaller that the PVC itself.  I then
>screwed endcaps on each side, and screwed that piece to the base of the
>stand.  The system has worked well for me.
>
>-Andy C.
>===============
>> << How do most secure a 6 inch diameter tube to whatever is the
>> base of the
>> > assembly...maybe the platform beneath the primary opening. If
>> you just let
>> > the end sit there, what prevents it from tipping over? Then
>> ends, of course,
>> > are sealed with non-conductive epoxy to 6 inch diameter plexiglas
disks.
>>   >>
>>
>> Ted, all,
>>
>> I use a variable coupling post and socket arrangement on my coils.
>> A wooden or plastic post is attached to the bottom of the secondary.
>> The post can be 1.5" dia or so for strength.  The socket is made of
>> wood to accept the post.  The post can slide up or down in the socket
>> to adjust the height of the secondary.  A screw which screws through
>> the side of the socket bites into the post and holds the secondary at
>> the desired height.
>>
>> Cheers,
>> John Freau
>>
>>
>
>And Gary too.
>
>
>