Minutes of the Tracker
Meeting
December 4, 2003
Action Items:
Agenda:
- Summary of yesterday's engineering meeting
- Results from inspections and measurements in Italy
- Sidewall coupon testing issues, Ben Rodini's requests, etc.
- Plan for testing at SLAC the 120-degree countersink idea
- T/V test preparations, Jack's travel plans. . .
- MCM preproduction status, pitch-adapter attachment test, etc.
- A.O.B.
There was some discussion of
the engineering work going forward on the flexure-grid interface. See the web page http://www-glast.slac.stanford.edu/Tracker-Hardware/ART/vibe/vibe.html
for the latest. Sandro, Riccardo, et al
will review the SLAC sketches and send their own suggestions on Friday.
Tom will start looking into
getting more precise shoulder bolt made, so that the clearance between bolt and
hole in the Grid can be closed up.
Sandro emphasized that he
would like a steel or titanium sleeve in the grid, to support the shoulder of
the bolt. He suggested to do a mock-up
the joint and do a pull test to see if the grid is damaged.
Sandro mentioned the
possibility of a helicoil with a locking feature.
No measurements were yet
made on the new fixture. The fixture
was changed out, replacing the damaged one with the new one, and they are going
forward with the ESPI test on the tower.
They inspected the old
vibration fixture. There was no visible
damage to the helicoil. Also, it looks
like all threads were used except about 1.5, so the thread engagement was not
as bad as Tom thought.
Robert said that he will
send two PWBs with pitch adapaters attached at Teledyne with Ronaldo, to be
inspected in Italy for wire bondability.
Also, the bias circuits will be sent with Ronaldo if Parlex gets them to
SLAC in time. Parlex had issues with
their plating processes and is a couple of weeks behind in delivering the bias
circuits.
Pisa will select honeycomb
samples to send to SLAC. Tom suggested
to ship them with Elliott or with Luca/Ronaldo in the SLAC case that is already
over there.
Sandro confirmed that in the
vibration test, the torque in the side flexures only decreased from 2.9 N-m to
2.5 N-m on two separate flexures in slots +X and +Y. There was no complete loss of torque in the side flexures.