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Wed Sep 2 08:13:18 2020
Cryo vacuum chamber
Assembly of QIL Setup and other updates from 2020 Sep 01
2020 Sep 01, StephenA with remote assistance from RaymondR
Silicon Mass - Rana had dropped off the Silicon mass in the first room, so I found it when I arrived - thanks!
Organization - It was my first time accessing the QIL lab, but everything was pretty well organized and easy to find. All tools for modifications to parts were used in the EE lab which was also well organized. Raymond helped me to figure out where to access things on a few occaisions.
Packages - received from Downs Logistics room the Electropolished shield set, a Grainger order with deburring tool and step drill bit, and a McMaster order with a range of bolts - these have all been transported to the lab. Also transported the QIL machined parts that I had received from Machining Solutions to the lab.
Koji's Photodiode holders are in the QIL lab ready for pickup.
Summary of progress
Assembled frame (using torque values from T1100066- #8-32 used 20 in*lb)
Assembled brackets to frame
Hung silicon mass from music wire
Wire is captured under #4-40 SHCS with washers ((using torque values from T1100066- #4-40 used 5 in*lb)
Outstanding tasks and questions
Did the hang hold?
Do we want to have the layered Electropolished and Plain shields during the first installation? Or some sanded state?
Assembly requires oversized #8-32 washers which I wasn't able to track down from inventory - these are now on order, along with some more supplies for roughening the surface.
Refer to the DCC -
- for the videos capturing this assembly effort. I've snagged some screenshots which I've dropped into the attachments.
There is a tree catching procedures and other experiment documentation for the QIL Setup at
Issues - there were four issues with the fabricated parts, three of which required small modifications;
D2000299-01 small angle rails had threaded holes where there should have been clearance holes for the interface (no issue on big angle rails)
modified by drill press to drill out clearance holes at same location
D2000308 interface cubes all were threaded only partially through.
No action taken, just paid attention and made sure the threads I needed were adequate. Seemed like an offset of only a turn or two, suggesting the CAM program was just a little off (this can happen with tapping, the tap is tapered and the machinist needs to thread deep enough to have the thread major diameter realized through the hole.)
D2000307-04 frame upper spacer had threaded holes that were not tapped all the way through.
I ran a tap through all of these threads.
D2000299-02 large angle rails had threaded holes that didn't pass all of the way through, and we happened to be inserting screws into the wrong side.
I ran a screw through these threads, which required a little bit more force than I would have liked, and forcing the screw provided an adequate thread.
Note that I anticipate that there will be an issue similar to this, with similar resolution, on the D2000299-01 small angle rails. The shield panels installed on the sides are to be installed from the inside. This can be resolved with a screw coming in from the outside.
There was also some inability to access certain screws with the long torque driver, especially if loosening/tightening after putting the frame together.
This was managed by use of an L allen key, which of course meant those joints were not torqued to spec. I'm not worried about this compromise.
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