Ring Loading Tooling
Ring Loading Tooling Drawings: 19-1 Ring.zip
- In the future, use drawing release process to reduce risk of interface issues.
Stave Loading Tooling
Stave Loading Tooling in progress...
Summary of requirements for loading 19-1 Outer Barrel Stave:
- Load RD53a Quad modules (drawings: 150um, 400um) with connectors oriented as shown in picture above
- Load modules onto 19-1 OB 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)
- 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
Summary of different requirements for loading 19-1 Inner Barrel Stave:
- 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)
Summary 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).
- Dowel pins in baseplate – two per module location.
- Bridge to have bushing and slot for precision fit onto dowel pins.
- +/-25um local support position relative to loading tooling baseplate coordinate system (to accurately place modules to meet +/-75um requirement).
- Dowel pin in baseplate – to accurately locate one end of the Stave in Z.
- Tooling to fasten to mounting features on ends of Stave.
- +/-50um module position relative to loading tooling baseplate coordinate system (to avoid collisions with 100um gap between modules).
- 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 apply pressure at all vacuum pad locations during gluing.
- Loading bridge to have micrometer adjusters to level the tool relative to the pickup table – to make good contact between vacuum pads and module.
- 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.
- Tolerances:
Tolerance Item | Where Used | Tolerance (mm, Dia.) |
Pick-up Table Edge | Locating Quad Module to Pickup Table | 0.012 |
Bridge Bushing ID | Locating Loading Bridge to Pick-up Table | 0.012 |
Pick-up Table Pin OD | Locating Loading Bridge to Pick-up Table | 0.012 |
Pin Location | Locating Loading Bridge to Pick-up Table | 0.020 |
Bridge Bushing ID | Locating Loading Bridge to Loading Fixture | 0.012 |
Baseplate Pin OD | Locating Loading Bridge to Loading Fixture | 0.012 |
Pin Location | Locating Loading Bridge to Loading Fixture | 0.020 |
Total: | .100mm (+/-.050mm) | |
Root Sum Square: | .039mm (+/-.019mm) |
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