Stiff%20tail%20troubles - PowerPoint PPT Presentation

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Stiff%20tail%20troubles

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Stiff tail troubles The new stiffer hybrid tail flexes the interconnect card on the rod by about 1 to 1.5 mm Some tilt in the connector as well – PowerPoint PPT presentation

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Slides: 9
Provided by: kyr46
Learn more at: http://hep.ucsb.edu
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Title: Stiff%20tail%20troubles


1
Stiff tail troubles
  • The new stiffer hybrid tail flexes the
    interconnect card on the rod by about 1 to 1.5 mm
  • Some tilt in the connector as well
  • Force needed to push board flat 250g
  • Rod tested fine at room temperature, but not in
    the cold (could be open connectors)

2
Old, softer tail in the same position
  • Some flexing of the PCB board
  • No tilt in the connector
  • Force needed to push board flat 80g

3
New bends to the tail
  • Pos. 3 on the rod (smallest gap between module
    and interconnect card)
  • Tail bent in situ on the rod
  • Bends are close to c-fiber than before
  • Some improvement, but still deflection of the PCB

4
New bends to the tail
  • Same bend moved to pos 5 (larger gap)
  • No deflection of the PCB
  • But Highest point of tail is 1.5mm above
    stay-clear, not acceptable

5
New bends to the tail
  • Tail bent like original (soft tail)
  • Added kinks with tweezers, while module was on
    the rod
  • Less deflection of the PCB ( 100g)
  • Also works in pos. 5
  • The 2 modules used for these tests showed no
    opens in the tail after extensive bending

6
The tail tale continues
  • The goal is to bend the tails only on the vacuum
    fixture, not on the rod, to avoid putting stress
    on the connector
  • Try out new bending tools (the tweezers used
    previously crease the tail dramatically)
  • non-tapered rounded tweezers
  • Modified sur-clip pliers

7
Bending with the new tools
  • Was not able to repeat the tail bend shape
    previously developed (see slide 5) by bending on
    the vacuum fixture with either tool
  • Try different shapes
  • Tweezers work better than surclip pliers

8
Best bend so far
  • Small radius on top, large radius on bottom
  • Use new tweezers to make the small radius bend at
    the connector end, and bend tail back over the
    module frame by hand to make bottom part more
    rounded
  • Board deflection 80g
  • This seems to be as good as it can get without
    bending the tail while the module is on the rod
  • A SS6 rod was assembled using this bend on all
    modules, still needs to be electrically tested in
    the cold
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