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Right angle HDI bend and dimensions


I made a holder to hold one of the small HDIs at 90°. The HDI bends of the 3 modules at BNL had relaxed by ~25°.

Fig. 1 ->

Measurements were taken from the model, with stops at 68.3mm horizontal and 27.8mm vertical.

Fig. 2 ->

The HDI did not fit - the neck was too long.

Fig. 3 ->

After cutting 5mm off the vertical stop, the module fit, and was placed back in the dry box at about 15:00 Wed Oct 27. The next day, the HDI relaxation angle had decreased from 25° to 15°.

Fig. 4 ->


The apparent discrepancy, of order 5mm, between the measurements from the model and the dimensions of the as-built HDI are not yet understood, since the drawings are generated semi-automatically from the 3D model.
Hubert van Hecke
Last modified: Sat Jan 15 14:58:31 EST 2011