Page History

...

• 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.
• 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:
  • Module position relative to loading tooling baseplate (need +/-.050mm):

...

• • Stave position relative to loading tooling baseplate (need +/-.025mm):

• Total for all:
  • Limit: +/-.075mm
  • Root sum square: +/-.026mm

...