Minutes of the Tracker
Meeting
May 20, 2004
Action Items:
1.
Riccardo:
send Martin the tray thickness measurements for the adhesives
2.
Riccardo
or Sandro: send Martin the dimensional inspections on the mid-tray closeout
machining
3.
Sandro:
update the PS-01801 document by Monday
4.
Sandro:
send Martin a drawing of the G&A grounding lug and the copper material spec
5.
Jim:
get a PR going for the vibration fixture
6.
Jim:
find the status of the Ti washers (done)
Tray Assembly at G&A:
Sandro reported that G&A
is still doing evaluation of wire bonding.
A short report from them is expected tomorrow afternoon.
Luca needs some changes made
to LAT-PS-02367, which Hiro will do.
Luca is still working on the G&A electrical test document.
Luca needs a clamp-on
current meter in Pisa. Hiro has at
least one already to send.
Martin is working on the top
and mid-tray-with-converter assembly drawings, for mounting MCMs and
ladders. He has lots of redlines made
but has a shortage of designers and will have to wait until Monday for Mike
Foss to return.
Sandro reported that the
core thickness in the mid-tray panel assembly drawings are not the same as the
actual (28.04mm). The actual value is
correct, however.
Tray glue thickness:
Riccardo is at G&A checking out the tooling for the bottom tray. He will do the thickness crosscheck tomorrow
and then sent Martin information to include in the drawings. This concerns the bond thickness between
tray, converters, and bias circuits.
Martin reminded INFN that he
still need redlines for mid-tray piece-part drawings to show their as-built
condition. Sandro said that there were
no redlines to the closeout drawings and that the machining was done to the
print. Martin had a hard time believing
that it could be possible since the Swales drawing checkers found a lot of
problems with those drawings, such as inconsistent dimensions and tolerances. Martin decided that he will have to redline
the drawings himself and in order to do that wants to receive the closeout
inspection data. INFN Pisa will send
those data to him or provide a web link.
Sandro will work this over
the weekend on the PS-01801 assembly procedure document, for the work at
G&A.
For the TMCM pin fabrication
they are waiting 1 or 2 more days for the material (6082 aluminum bars). After that the machining will be fast and
Sandro expects to have the parts by the middle of next week, including
coating. The shop is the same Plyform
subcontractor who is doing the inserts.
G&A needs Nusil
adhesive. Jeff has been working on
getting them. The CV2500 is haz-mat and
therefore cannot be hand carried, so it may be another week or so getting to Pisa.
Robert reported that 15 MCMs
should complete burn-in on Saturday.
They then go to a final electrical test and will be ready for shipping,
except that 4 of them have an NCR against them. Robert will work with Roger and Marcus on Saturday to do some
tests on those 4 at –30C to see if there really is a problem (they had some
errors in register readback at that temperature) and whether it can be
resolved. So those 4 might have to ship
out later. Tom pushed to get the 11 at
least on an airplane Saturday or Sunday in the hands of a courier.
Nanda will check on whether
cables are needed from SLAC for the G&A test. Minitower cables will work, but they need to be tested to a “released”
written procedure first.
Mid tray issues:
Aeroglaze tape test: The associated NCR needs closure by MRB
before trays are used with flight MCMs and ladders.
INFN received various
recommendations for suitable tape. They
will try to test tomorrow at Plyform. Plyform confirmed that they are qualified
to do the test. Ben wants tape with adhesion equal to or better than what they
talked about yesterday (500 g/cm2). We
will need data sheets or certs for the tape to verify that spec. Riccardo will be there at Plyform during the
test.
Plyform urgently needs the
Nusil CV-2646 conductive silicone adhesive for installing the grounding tubes
and, on the bottom tray, the grounding wire.
It was stuck in Chicago but should be at SLAC soon. It is not hazardous and can be hand carried.
Bias circuits:
Parlex was set back a week
or so by problems with getting good material from Dupont. The recent batch of 47 circuits was lost in
the mail, it seems, for a while, but we learned during the meeting that they
were Fed-Ex’ed to SLAC and should arrive today. Another 50 are expected at SLAC next week, and a large lot of 250
is in work for the following week.
The tray-panel
thermal-vacuum procedure was sent to Natalie to go out for release. Monday they went to Roma II for a review,
including Aldo for QA: the fixture will be modified by tomorrow and a curtain
is being installed between the test setup and the door.
Aldo will also visit G&A
in the same way, next Thursday or Friday.
Bottom Trays:
Riccardo is at G&A
checking out the metrology on the tooling.
Insert material and
machining: Sandro has material certs, and they conform to Martin’s drawing (AMS
3928 spec). The material should be in
hand by tomorrow and inserts machined next week.\
Bottom tray core trimming will
be done at time of use at Plyform. This
is routine for them, so they have internal procedures.
The static test fixture grid
simulator is under CMM at SLAC. Some
features don't conform to drawings because there are redlines. Mike has drawings
in work for the as-built state. They should
be done with the CMM today; Mark Molini will hand carry it to Pisa.
Interface hardware: Mike
called receiving yesterday and it wasn't in; Jeff said that AMT will not
deliver until May 25th. Mike will call and check if there is a
partial delivery. (GSFC has not started yet on their batch.) The goal is to hand carry 17 of them to Pisa
on May 30th. The other 17 will
go to Santa Clara for coating; then to San Diego for the locking feature; then
back to SLAC. Santa Clara is 1-day, but
we don't know the San Diego lead time. 10
studs made on the spur of the moment to relaxed tolerances are being picked up
today in Santa Clara with coating. Some
will go to San Diego, so we will know the turn-around soon.
Top/bottom tray assembly
procedure: tomorrow another draft should go out for review.
Top/bottom tray assembly
drawings were sent out a few days ago by Martin for review. Sandro said that the only comment from INFN
is glue thicknesses. However, the
drawing needs to conform to the inspections to be done at Plyform. Sandro will
verify that Riccardo has reviewed the drawings. The top tray assembly drawings will go out for release. The bottom tray assembly drawings are still
on hold for some details such as lugs.
Martin was concerned that he
had been told that crimping is a better solution for the grounding lug than
soldering. However, Jerry said that
solder is fine for such a small wire. Martin
will follow up with Nick whether the G&A lug solution is acceptable. Jerry will help out. Martin needs a drawing from Sandro. He also needs the copper spec.
EM vibe test status &
schedule:
Vibration fixture machining:
the drawing is signed off and will be released today with Jerry’s comments
incorporated. Jeff wants to go to dual
sources: Tapemation and 1 other. Jim
will work on getting the PR started today.
Nuts: Jeff placed an order
for 30 nitronix nuts with 2 weeks lead time.
Procedures: John hopes to
send out the static test pretest analysis today. H thinks we can finish all cases in 2 days during the actual test. His schedule: dynamic test pretest analysis
by May 26; TRR on June 2. There will be
no force limiting, so he can update the previous procedure with few changes. He may want to reorder the tests. Also the depth of the notch is being
re-evaluated.
Peter is working on cone
extraction tools. It takes 300 lbs to
press the cones out of the flexure. A
machinist is making a tool by Monday or Tuesday. Also spanner wrenches are on the way by Monday.
Mike says that for cone
installation we will have a detailed procedure to start with, which will be released
after static and vibe tests. Can we use
GSFC cones for the alignment simulator?
If not, then we may have to re-use the static test cones for that.
Mike said that there is no
coating planned for cone surfaces.
Molydisulfide lubricant did not change the removal force much.
Arthur has a concept for
locating the start position for the 9 cones installed following the 3 alignment
joints. It has not been tried yet.
Sidewalls:
Prepreg
delivery: it should have been shipped yesterday; Riccardo will get status
tomorrow
Release of the specification document: new draft will be ready
Monday
Titanium washers: Jim will find the status
Facesheet coupons will be in
the mail to Ben tomorrow.