Re: Bending rectangular copper waveguides
- From: "christofire" <christofire@xxxxxxxxxxxxxx>
- Date: Fri, 14 Nov 2008 17:32:09 -0000
"Rene Tschaggelar" <none@xxxxxxxx> wrote in message
news:491d7041$1@xxxxxxxxxxxxxxxxxxxxxx
During my work I came across several way to
bend a rectangular waveguide. The copper is
best softened before by a heat treatment.
Then the choices are :
- fill it with sand and heat while bending
- fill it wit water, freeze it with LN2 and bend
- fill it with Wood metal melting at 60 Celsius
and bend at room temperature
- fill with brass strips and bend at room
temperature
Short of trying all, what are the better choices?
Yes, I'm aware there are rectangular cast bends
to solder in. They are limited the rectangular
though.
Rene
If you have no experience with any of these methods then you probably need
to try some of them and compare the results (e.g. by way of swept
return-loss measurements) because there is more to each method than you've
mentioned. For example, using 'Cerrobend' you need to choose whether you're
going to bend the waveguide: between rollers; by hand with one end in a
vise; in a press with a form tool or caul; and so on. Each may yield
different results and you may need to refine the technique. I've never
heard of success using sand although I suppose it might work if the ends of
the guide are suitably plugged. Ice doesn't sound likely to work - surely
voids would appear as the guide was stretched during the bend?
However, if you intend to apply these techniques to circular or elliptical
guide with the intention of preserving the cross section then you are asking
a lot and you might be better off getting electroformed elbows made. If you
do, keep in mind that electroformed copper can be gas-permeable - I made
that mistake once!
Chris
.
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- From: Rene Tschaggelar
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