1248 finalize design of back panel acrylic for v04

[casa-code]

Description

-- Finalize design of back panel acrylic for v0.4 #1248

Summary of changes

• Power connector properly attached in CAD #1040
• Power switch properly added in CAD #961
• Added USB cutout in CAD #1280
• Added Ethernet cutout in CAD #1281
• Oxygen Inlet fittings updated in CAD #646

Relevant motivation and context

Dependencies that are required for this change

Updates #(issue)

Finalize design of back panel acrylic for v0.4 #1248

OR

Closes #(issue)

Self-review checklist:

• [ ] Self-review: looked through the Files changed tab, browsed repository in branch
• [ ] Documentation updated - reflects changes in code, electrical or mechanical design
• [ ] Documentation and graphics follow the documentation style guide
• [ ] New content is linked, easily discoverable, does not require too many clicks
• [ ] Follows other relevant parts of contributor wiki
• [ ] PR has a descriptive name
• [ ] Tagged relevant reviewers

CAD / mechanical only:

• [ ] Follows our mechanical engineering standards
• [ ] Everything is metric and ISO where possible
• [ ] All features and constraints are named
• [ ] Imported parts are well-named, with source URL and iProperties
• [ ] Screenshots and/or assembly photos updated

[CLAassistant]

All committers have signed the CLA.

[codecov[bot]]

Codecov Report

Merging #1297 (acc412c) into master (91699f1) will not change coverage. The diff coverage is n/a.

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  Lines        3456     3456           
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  Hits         1973     1973           
  Misses       1483     1483           

Flag	Coverage Δ
common	95.90% <ø> (ø)
controller	57.19% <ø> (ø)
gui	28.05% <ø> (ø)

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[martukas]

Additional notes from assembling a work-in-progress version:

• I used 2.5 x 10mm thread-forming screws for mounting the power connector. According to the data sheet, length without head should be 3.175(acrylic)+6.60-1.8(head)=7.975mm, so the ideal part would be this: https://www.mcmaster.com/96817A894/
• Not a big deal, but connector cutout diameter is 13.2mm, should be 13mm per datasheet
• Screws that come with the USB pigtail are too short to make it through the acrylic. I found some with matching threads that worked. They were 12.25mm, not sure what that is in bald eagle units. It would be preferable to find ones that use either hex or torx bit rather than phillips. Length should not be longer than this because the nuts in the USB thingy have stops and part may not tighten to panel if they bottom-out.
• I think distance between the USB pigtail mounting holes should be smaller, as noted in measurements taken for #1280 . Was there a datasheet that you are going off of that says otherwise? It felt like I had to pry the tabs a bit wide.
• I think it's more appropriate to now call it the "main power panel" because it is not just the switch. Let's rename it.
• Not your fault, but it looks like the M2.5x14mm screws in our model link to the wrong McMaster part, the M5 instead. Can you please update it to be this instead? https://www.mcmaster.com/92095A504/
• The m2.5x14mm are actually quite expensive being an "odd" size. I would see if the next size up (16mm) might be a good option? This is a bit of "purchineering", i.e. purchasing-informed engineering.
• I think I will repeat myself -- the USB and Ethernet ports need to be moved further away from the metal edge and further from each other vertically. They seem ok in theory, but there will be a gasket where the closure panel meets the acylic. That screw head, if you look at the pictures I posted in Slack, is barely a millimeter away from the metal. We have plenty of space to spare here.