[time-nuts] FEI FE-5680A

Bruce Griffiths bruce.griffiths at xtra.co.nz
Fri Apr 2 00:10:40 EDT 2010

Leigh L. Klotz, Jr WA5ZNU wrote:
> On 03/24/2010 03:18 PM, Magnus Danielson wrote:
>> Fellow time-nuts,
>> ...
>> Second, anything I should keep in mind as I power one up?
>> ...
>> Cheers,
>> Magnus
> There's a bit of discussion in the archives about the need for a heat 
> sink, and also about the whether it's necessary to anneal the case in 
> a 400C Hydrogen reducing oven after the SMA modification.  (Although I 
> do have access to one, it is over the threshold for things I'm willing 
> to do.)
> Leigh.
If one were to use a trepaning tool with loose abrasive and plenty of 
water coolant and slowly grinds the required hole through the mu metal 
cover, the thermal stress and mechanical disturbance of the mu-metal 
shield should be minimised precluding the need for hydrogen annealing. 
This is easily done using a drill press and a suitable tool.
The tool can be assembled from brass tubing and rod. Since the forces 
involved are low even soft soldering should suffice.

Water jet cutting should also work well.


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