Re: Invar low expansion metal


Ed Majden wrote in message ...
>in article dgfpso$o78$1@xxxxxxxxxxxxxxxxxxx, Malcolm Stewart at
>malcolm_stewart@xxxxxxxxxxxxxxxxxxxxxxxx wrote on 9/16/05 18:00:
>
>> <Havriliak@xxxxxxx> wrote in message
>> news:1126905471.491937.86980@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>>> Boy is that stuff expensive
>>
>> Interesting -
>> a few years ago I bought an old surveying subtense bar which contains two
>> invar rods holding surveying targets set precisely 2m apart. It cost me
>> little more than 2x the currently listed cost of the invar rods, and I
had
>> no idea that invar was in this league, nor that invar was officially
graded
>> as "Harmful".
>
> Expensive is right! WOW! I didn't know it was harmful either! I'd
>better try something less harmful. Thanks to all for the information.
>
>Ed
>

well, try then a combination carbon fiber + kevlar epoxy composite . It can
get to extremely low and controlled CTE . You can also mold the part easily.

best regards,
matt tudor


.

Relevant Pages

  • Re: Invar low expansion metal
    ... > a few years ago I bought an old surveying subtense bar which contains two ... > invar rods holding surveying targets set precisely 2m apart. ... > little more than 2x the currently listed cost of the invar rods, ... I didn't know it was harmful either! ...
    (sci.astro.amateur)
  • Re: Invar low expansion metal
    ... a few years ago I bought an old surveying subtense bar which contains two ... invar rods holding surveying targets set precisely 2m apart. ... little more than 2x the currently listed cost of the invar rods, ...
    (sci.astro.amateur)
Quantcast