On Fri, Aug 29, 2014 at 10:31 AM, John Griessen  wrote:
> On 08/29/2014 10:36 AM, Nathan McCorkle wrote:
>>
>> I'd like to try and keep the chemical list down to a minimum, as
>> certain materials like to off-gas for a very long time and that
>> behavior can foul the vacuum and imaging system contained therein.
>
>
>
> OK, now I get that you're working on getting real vacuum over time
> and are investigating low cost rubber and wire, so that's why the piano wire
> idea.  Piano wire rusts though...
>
> Probably you could get decent results with a sharp sewing needle threaded
> with some
> stainless wire.  A #16 or #18 needle could be just right -- they come with
> standard sharp
> points, rounded points triangle knife points for leather.  Standard is going
> to be good for your
> test, and qty ten available on ebay for $4 shipped.  Maybe even hone it
> some on a fine ceramic whetstone, or piece of alumina like an
> old X86 computer chip package...those light purple ceramic computer chip
> packages.


All good ideas! I'm not sure how much I'd need to worry about rust, as
the inside of the vacuum should be quite dry, and the outside would be
very short... short enough that I could tin the wire with solder.
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