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Progress for August 3, 2011

• The boat shipment with the prime focus cage, cage cart, imager handling system etc … arrived on the mountain top this morning.

• It had been unloaded from the shipping container onto the flatbed shortly after it was taken off the ship, making it possible for Gale & co. to unload the boxes using a forklift.

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Unloading the Truck

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Unloading the Truck

• The boxes were taken off by forklift or crane. Dario drove the forklift.

• Here’s the unloaded truck just as it starts back down.

• Gale Brehmer in action.

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Stored Boxes

• All but one of the boxes were stored inside on the ground floor. Looks like there won’t be any basketball this trip.

• The box containing the cage and cage cart was stored outside. – Gale is going to cover it

with a tarp to protect it against the weather.

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HexaPod Progress for Aug. 3

• Brenna, Alistair, Klaus, Steve and Tom met with GG and Danielle from ADS and reviewed out experience with the hexapod during this trip. We discussed the significance.– The ~70 micron shift in Xmax corresponds to a 4 um shift in the

position of the faulting joint limit switch on actuator 2. – We agreed that this small shift maybe due to either the vibration

from the shipping or even simply because the Coude Room is at 50 deg and previous tests have been at more like 70 deg F.

Hexapod– It is important to ensure nothing can

“come loose” after we mount the hexapod on the barrel.

– A software and/or firmware update with a new limit inside X=15930 can be performed at any time we are in position to power the hexapod rack.

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HexaPod Progress for Aug. 3

• Steve and Tom identified the offending limit switch (#4 of 8). It’s on the underside of the #2 flexure.– These limit switch contacts look very sensitive and delicate, so we

stayed away from them– We noticed that the upside-down bolts on the underside had no

Loctite but all the right-side-up ones on other limit switches did.– Steve tightened the 7mm hex-head bolts (2) that attach that joint

limit switch shim plate to the flexure knuckle. They turned ~1/12 to 1/6 of a turn. It is important to note that they weren’t loose.

– Steve also slightly tightened the corresponding bolts on actuator #6.– The ones on #4 didn’t move.– The limit switch is still engaged at X ~ 15930 microns, as before.

• Steve checked the long power cables. They are OK.• We reran the full motion test and recorded the data for later

analysis.

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Progress for August 3, 2011

• The Filter Changer and Shutter are buttoned up. And in the Coude Room.

• Ken & Cheryl worked in the carpentry shop near the warehouse area.

Carpentry Shop

• They made progress on assembly and painting of 3 cabinets.

• The color: nobody but Cheryl (and Ken) knows.

• Ken and Cheryl returned to La Serena and will be back early tomorrow.

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Next Steps & Plan

• Hexapod– Secure the hexapod, leaving it safely stowed in the Coude

Room for the late September trip. It will be warmer – we can check the temperature dependence of the limit switch position.

– Steve will take the 6 short power tails from the rack (that his power cables plug into) back to FNAL for retermination.

• Finish & fill cabinets• Put a tarp over the box containing the Cage.• Recover the boxes that we wanted to keep from the

outdoor trash pile.