...
- Load RD53a Quad modules (drawings: 150um, 400um) with connectors oriented as shown in picture above
- Load modules onto 19-1 OB Stave (no assembly drawing yet, preliminary CAD on LBL Windchill site)
- Load without collisions: 200um nominal gap / 100 micron minimum gap between modules (no assembly drawing yet showing modules on stave)
- Glue layer thickness to be 100um -50/+100um
- ESD protection during loading: grounding of tooling
- Mechanical protection of wire bonds during loading: stay clear of wire bonds, handle modules using tooling only, consider covers/shields
- Baseplate to be installed onto glue robot: weight limit 7kg (per manual)
- Stave to be removed from baseplate and transferred to test box for QC testing
...
- Load Triplet modules (drawing, .step)
- Load onto 19-1 IB Stave (no drawing yet, preliminary CAD on LBL Windchill site)
- Load without collisions: 200um nominal gap / 100 micron minimum gap between modules (no assembly drawing yet showing modules on stave)
Design approach intended to avoid collisions during loadingSummary of specifications:
- Closely toleranced pins/bushings – same approach as used for 19-0 tooling
- Requirement: +/-75um module position tolerance in local support coordinate system (per requirements document "ITk Pixel Module Loading Accuracy Requirements" AT2-IP-ES-006-v3)
- Distribute tolerances:
- +/-50um module position relative to loading tooling baseplate coordinate system (to avoid collisions with 100um gap between modules)
- +/-25um local support position relative to loading tooling baseplate coordinate system (to accurately place modules to meet +/-75um requirement)
- Glue with beads to control glue layer thickness
- 100um dia beads, for ~75um glue layer thickness on carbon fiber.
- Loading tooling does NOT control the glue layer thickness.
- Loading bridge to rest on the module's pickup areas (vacuum pad locations) during (~10 minute) hold for gluing.
- Loading bridge to have micrometer adjusters to level the tool relative to the baseplate to +/-12um.
- Loading bridge to have micrometer adjusters to level the tool relative to the pickup table to +/-12um.
- Vacuum pads to pick up modules
- Vacuum pads to fit within clear areas on modules.
- Height adjustment of vacuum pads while on pickup table.
- Vacuum to securely hold modules.
Notes for design of 19-1 Stave tooling:
- Re-use tooling from 19-1 Quad loading bridge; make new 19-1 linear Triplet loading bridge and tooling.
- Using beads to set glue thickness; no longer need dial indicators or differential adjusters.
- Use 2 sets of micrometer adjusters (absolute scale).
- Add soft material to vacuum pads for better sealing and smoothness.
- Consider adding a hole patterns for trussing / support below the 19-1 Stave baseplate.
- Reconfirm that Stave and Module CADs / drawings are compatible with tooling, before manufacture.
- Use dowel pins and screw interface to ends of Stave (locate same as in production assembly).
- Consider longer dowel pins in the baseplate (help locate the bridge, without pivoting).
Some past presentations:
- 30 March 2021: Tooling and Plans for Loading, 19-0/1, Stave and Ring
...