Minutes from the January 14
Tracker-Grid interface meeting:
1. All 12 tower mount points
will use dual-eccentric cones for adjustment
2. The Tracker group will
mount the tower on the vibration fixture and
verify (probably by CMM)
that the tower is standing within its stayclear
above that fixture. Probably the Tracker group will use a
fixture with pins
to reference the bottom tray
to the vibration fixture when doing this
installation.
3. Each cone will have a
clock dial etched into it, and the Tracker group
will include in the EIDP the
positions of the cones.
4. The tower will ship to
SLAC still mounted on the vibration fixture.
The
I&T group can use the
Tracker cone positions on the 3 fiducial flexures to
align the tower into the
Grid. They will then install the other
9 cone sets
in such a way as to minimize
stress.
5. The Pisa engineering
group will review the bottom tray assembly drawings
and make sure that the
tolerances are consistent with the actual
manufacturing
capabilities. This input will need to
be used to ensure that
the corner-bracket-flexure
assembly design is such that the tower is
guaranteed to go into the
Grid bay without interference (shims will then be
used to take up the
clearance).
6. A new IDD draft will be
sent out by COB Thursday, and comments should be
returned by COB Monday. A telecon will be held Tuesday at 8:00 PST
to
review the comments. The IDD and Tracker drawings will be
updated, and a
review/signing party will be
held on Friday. Fabrication of the
Tracker
titanium parts needs to
start the following Monday to meet the Tracker build
schedule (and even then the
lead time has to be 4 weeks, which will be
pushing it).