[Halld-cal] 1st Article Update

[George Lolos]

Hi Elton:

We already have a number of photos but we'll take some more on Monday  
and send you a number of them to choose for Eugene.

Cheers,

George

On 28-Aug-09, at 1:08 PM, Elton Smith wrote:

>
> Hi George,
>
> Thanks for the update.
>
> Eugene is preparing his presentation for the Lehman review and it  
> would be
> nice to have some recent photos of your production. Could you'all  
> prepare
> some nice photos of fiber production, matrix fabrication, etc...  
> anything
> to show off the work you are doing.
>
> Thanks, Elton.
>
> p.s. anytime next week will be fine.
>
>
>
>
> Elton Smith
> Jefferson Lab MS 12H5
> 12000 Jefferson Ave
> Suite # 16
> Newport News, VA 23606
> elton at jlab.org
> (757) 269-7625
> (757) 269-6331 fax
>
> On Fri, 28 Aug 2009, George Lolos wrote:
>
>> As this week is coming to a close and the tenure of the student crew
>> that worked on the construction of the 1st Article is also coming to
>> an end, a brief update is in order.
>>
>> As of today, 81 layers of lead and fibers have been built,
>> corresponding to approximately 83 mm of matrix height.  Next week,  
>> the
>> new crew of Co-op students will start so things will slow down a bit
>> as they learn the techniques.
>>
>> We have not seen any "serious" problems.   There's a slight (~1 mm)
>> variation in height at different spots along the matrix and almost  
>> all
>> of it comes from the first few layers, when the technique was still
>> not learned.   We performed several diagnostic actions to determine
>> its causes but nothing conclusive yet.  The fact that this variance
>> remains constant and does not increase with built is a good omen.
>> Maybe a fiber jumped its groove early on.  Once we machine the module
>> and we can inspect the two end faces we can tell better.   In any
>> case, we're within tolerances but we aim for perfection....
>>
>> One thing that we have decided is that all Al base plates for the
>> construction will be machined flat on the inner surface to assure an
>> excellent base for the matrix and a reliable base for matrix height
>> measurements.   Several other small improvements have been identified
>> for the second press frame and they will be incorporated in the
>> present one as well, where feasible.
>>
>> So far, so good....
>>
>> George
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>