[Halld-cal] 1st Article Update

[Elton Smith]

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
> _______________________________________________
> Halld-cal mailing list
> Halld-cal at jlab.org
> https://mailman.jlab.org/mailman/listinfo/halld-cal
>