RE: [TCML] Secondary form material

["Phil Tuck" <phil@xxxxxxxxxxx>]

Andrew.
I use Acrylic without any problems. Sawing a tube is achieved by taking a
very light cut all the way around with a fine handsaw and gradually
increasing the depth each time you circle around. I find lathe cutting oil
helps wash the bits away and cools the saw blade, as it tends to stick in
the cut otherwise. 
Drilling is best done with a lubricant as well. 
If you varnish the tubes surface before use it helps the magnet wire to
grip. I make end caps out of Medium-density fiberboard (MDF) turned on a
lathe and glued in the ends.

Plastic pipe used by gas companies comes in various large sizes, plus
plastic sewer pipes (depending on where you live)

Regards

Phil
www.hvtesla.com

     



-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of Andrew Robinson
Sent: 26 June 2009 19:58
To: tesla@xxxxxxxxxx
Subject: [TCML] Secondary form material

As many have already discovered, PVC is apparently a terrible material 
to use as a secondary coil form. About a week ago my engineering group 
also discovered that acrylic is extremely hard to work with. We ended up 
cracking our only secondary coil form which we slaved over to find! So 
my question to everyone out there is what on earth should we use for the 
secondary coil form. We need a 4" OD coil form and if possible, if you 
can name a material that can also be an 1/8" thick we have a nice 
cutting tool that makes the most perfect end caps. So ideally 4" OD and 
3.75" ID is perfect for what we need. I've called numerous plumbing 
companies with no help what so ever. Thanks everyone!

Regards,
Andrew Robinson
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