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You're correct. High Density Polyethylene (HDPE) or Ultra High Molecular
Weight (UHMW) polyethylene are both good choices. Both materials are
strong, easy to machine, are excellent electrical insulators, they don't
easily carbonize/track, are readily available, and are relatively
inexpensive.
Before settling on this design approach, you may want to think about how
you will tap the primary. Most coilers find that they need to adjust
primary inductance for fine tuning. Even changing the size of the
topload will result in a tuning change. Using a series of slotted radial
"spokes" of machined HDPE would provide you with the same degree of
primary support while also permitting easy tapping.
Bert
--
Bert Hickman
Stoneridge Engineering
http://www.capturedlightning.com
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t-burns14 wrote:
I have an opportunity to use a CNC milled piece for my base, as seen
in one of the Geek Group videos. The milled a spiral into the piece
of plastic and then just hammered the tubing into the spiral cutout.
I'm wondering what material would be good for that. They might have
been using High Density Polyethylene, because I remember them saying
it was food grade and polyethylene is used for cutting boards. Any
insight? Thanks
Sent from my Galaxy S®III
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