[volt-nuts] plastic caps on 3458A reference board

[John Phillips]

I needs to insulate electrical and thermal and metal would not do well.

On Wed, Jan 28, 2015 at 11:36 AM, Dr. David Kirkby (Kirkby Microwave Ltd) <
drkirkby at kirkbymicrowave.co.uk> wrote:

> On 28 January 2015 at 18:56, Charles Steinmetz <csteinmetz at yandex.com>
> wrote:
>
> > The problem is that an LTZ1000 (or LM399) runs hot enough that most
> plastics
> > you find lying around won't stand up to it for very long (some of them
> melt
> > almost immediately when you power it up).  This is true even of
> > polycarbonate, which is one of the most durable common plastics, and is
> why
> > the original caps were made from polysulfone.
> >
> > Unfortunately, it also means that replacements may be hard to make by 3D
> > "printing," since the process depends on melting the base material.
> >
> > Best regards,
> >
> > Charles
>
> Is there any reason this cap is not made of metal? If its purpose is
> to restrict airflow by convection, metal will do. Copper sheet can
> easily be soldered to make something that would restrict airflow and s
>
> If you want thermal insulation, then PTFE rivited to a metal shield
> would provide a plastic that will not melt, and the metal would keep
> it in place, as its hard to form a box out of PTFE. It is not an easy
> material to glue, but nuts/bolts/rivits will work.
>
> Dave
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-- 

*John Phillips*