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M3
M2
A1

Motivation

LCn needed to depict safety devices preventing reaching in to a running machine but enabling the worker to load/unload the machine and maybe also see the process of fabrication to intervene if necessary

Trivia

First used a rolling shutter and a safety device bridge, called "red key", which allows running the machine with open rolling shutter (-> unsafe but happens)

  • was developed for drilling machine in M3
  • used a rolling gate 3D model with decreased size, adapted texture (same colour as machine: light grey), and rotated by 90°, so it opens vertically (instead of horizontally) -> to indicate that it is a shutter manually operated by the machine operator we added a handle (affordance)

Picked up topic (bridged safety device) in A1 but decided to use LCn

  • developed for machine which currently is assembled (not in use yet) and does not have any deductible purpose (only a case with a terminal and conveyor belt)
  • self-designed by constructing all typical elements using CAD (PTC Creo)
    • housing
    • LED/Sensor-ridge
    • blackened glass cover
    • light beams (representing the curtain)
  • we used already available "materials" (texture in unity):
    • moving light for light beams from MRTK
    • yellow from customers safety campaign
  • we added textures
    • blackened glass (translucent black)
    • diagonal black bars on yellow for housing
  • we added a key-operated switch for the purpose of bridging the safety device
    • later was moved from operating panel on the left to right below left part of LCn (to indicate/underline that they belong together) and got yellow metal sheet as mount (visually connected to light curtain -> belongs together -> affordance(?))
  • larger than in reality to pop-out
  • shows light beams, in reality those are invisible for humans (human eye cant see infrared light)

Problem with LCn on unfinished machine: a switched off safety device preventing to reach into running machine is no problem if the machine is not running. While in assembly, the machine might only run in test mode for which bridging safety devices is no issue (one of the view situations where it is OK).

-> replaced rolling shutter in M3. Rolling shutter also is used in A2 (former M2) and switched-off LCn remains in A1 ("decoration"/context)

Reflections

designing objects (the LCn) driven by need (no light curtain in right size available) but with known tool (cf ESr Overview and CAa Overview)

reflecting materials from reality in virtuality (pretty direct material dialogue)

Related Commits

Additional Data Points

Terms:
light curtain
gate
shutter
drill
red key
redkey
machine

06/09/2018, Mail to Customer/protocol: P060918
Room manufacturing:
...

  • Scene 2 (machine)
    • ...
    • open machine part
      • intervene: FORBIDDEN
      • Remove red key and close --> may have to be moved to another room or new scene

09/10/2018 Protocol P091018
Room: Assembly

-...
- Key switch Light curtain next to light curtain and larger
- ...

15/11/2018 Protocol P151118
Room: Assembly

  • ...
    -Assembly02: Redkey larger
  • ...

15/11/2018 ARS-128 Assembly02: Redkey larger

15/11/2018 ARS-129 Assembly02: Machine on (display)

14/12/2018 Protocol P141218
Manufacturing03
...
Light curtain from Assembly01 here, machine on
...
Assembly01
...
Light curtain to manufacturing
...
Assembly02
...
Activate drill

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