Outline
- Stave Loading Tooling, 19-1 RD53a L1 Stave – .zip - 11 March 2022.zip
- Stave Loading Tooling, 19-1 RD53a L0 Stave
- Ring Loading Tooling, 19-1 RD53a
- Handling Frame, 19-1 RD53a L1 Stave
- Shipping Box, 19-1 RD53a L1 Stave
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Items | Vendor | Date | Response |
---|---|---|---|
| GoProto | 3/3/2022 | Working on quote |
| SLAC machine shop | 3/4/2022 | |
| KAL Machining | 3/7/2022 | No bid (capacity) |
| Parametric USA | 3/7/2022 | |
| Pro-Tek Manufacturing | 3/7/2022 | Received |
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- 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 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:
- Module position relative to loading tooling baseplate (need +/-.050mm):
- Baseplate has:
- Dowel pin, stepped, 6mm OD, h7 tolerance. (Misumi SWPG6-P6-Q5.5-L12-B12-E3-F15)
- Dowel pin, stepped, 8mm OD, h7 tolerance. (Misumi HWPG6-P8-Q7.5-L11-B12-E3-F15)
- Loading bridge has:
- Bushing, 8mm ID, G6 tolerance. (Misumi JBAUN8-20)
- Machined slot, 6mm internal width, G6 tolerance.
- Baseplate has:
- Module position relative to loading tooling baseplate (need +/-.050mm):
Dimensioning scheme changed to hole-to-hole tolerancing (instead of hole-to-edge):
Tolerance Item | Where Used | Tolerance (mm, Dia.) | ||
Pick-up Table Edge Repeatability | Locating Module to Pickup Table (repeatability of lining up module to machined edges)Locating Module to | 0.025 | ||
Pickup Table | .000 | Bridge Bushing ID | Locating Loading Bridge to Pick-up Table | 0.012019 |
Bridge Pick-up Table Pin OD | Locating Loading Bridge to Pick-up Table | 0.012 | ||
Pin Location | Locating Loading Bridge to Pick-up Table | .025 | ||
015 | ||||
Baseplate Hole Bridge Bushing ID | Locating Loading Bridge to Loading Fixture | 0.012025 | ||
Baseplate Bridge Pin OD | Locating Loading Bridge to Loading Fixture | 0.012015 | ||
Pin Baseplate Hole Location | Locating Loading Bridge to Loading Fixture (hole locations dimensioned as +/-.04 from adjacent hole, i.e. up to -.02 per hole) | 0.025020 | ||
Total: | .098mm 119mm (+/-.050mm060mm) | |||
Root Sum Square: | .043mm 050mm (+/-.019mm025mm) |
Stave position relative to loading tooling baseplate
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:
Tolerance Item | Where Used | Tolerance (mm, Dia.) |
Pin Location | Locating Stave to BaseplateLoading Bridge to Loading Fixture (hole locations dimensioned as +/-.04 from adjacent hole, i.e. up to -.02 per hole) | 0.020.025 |
Pick-up Table Edge Accuracy (absolute position) | Locating Module to Pick-up Table *this item affects all modules equally so does not affect gap/distance between modules | 0.025060 |
Total: | 0.080mm (+/-.040mm) | |
Root Sum Square: | 0.063mm .050mm (+/-.025mm032mm) |
- Total for all:
- Limit: +/-.074mm100mm
- Root sum square: +/-.028mm040mm
- Requirement: +/-.150mm
- Module Nominal Spacing (for 19-1 L1 Stave): .250mm (nominal gap)
- Worst case clearance: 0.012mm
- Clearance with RSS tolerance (3σ): 0.180mm
A design/drawings were made in 2020 (Version 1, deprecated, not released):
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