From luis.sospedra@ific.uv.es Mon May 24 10:58:58 2004
Date: Mon, 17 May 2004 17:27:36 +0200
From: Luis Sospedra <luis.sospedra@ific.uv.es>
To: Richard Bates <r.bates@physics.gla.ac.uk>
Subject: Re: returned spines

    Hi Richard

    We did not returned 153 (it is at MPI) but 135.
    I have attached photos of most of the defects I'm going to summarize.

    - Spine 135 (20220990290576)
        It has a bending of the central wing of the AlN of 0.8775 mm.
        But the reason to return this spine is a step on the TPG-AlN 
contact at the Top Right wing of the spine of 0.1 mm bigger than the 
0.9mm of the spine-detectors gap for glue. So detectors could contact 
spine and spoil the alignment.
    - Spine 159 (20220990290600)
    There is a step on the TPG-AlN contact at the Top Right wing of the 
spine of 0.09 mm equal to the spine-detectors gap.
    It also have as you mentioned crease in tpg at far end mounting ceramic.
   - Spine 166 (20220990290607)
    There is a step on the TPG-AlN contact at the Top Right wing of the 
spine of 0.085 mm.
    But the reason to return this spine is the crease in tpg at hybrid 
side mounting ceramic.
    - Spine 167 (20220990290608)
    Is not the scratches on the spacer but a crack in the left wing at 
far end mounting ceramic.

    I check twice every spine before return them and it is always the 
last step to be taken.
    The crease you mentioned it affect not only to the mechanical 
stability of the spine but also the thermal one. I reject the ones, 
where this crease it highlight an inner breaking of the TPG fibers that 
bring the heat from the module to the cooling block.

    Cheers, Luis.

Richard Bates escribió:

>hello Luis,
>
>4 spines (numbers 153, 159, 166 and 167) were retuned to CERN from
>Valencia.
>I have given them a quick inspection (just visual, no measurements) and I
>have seen some reasons why they might have been returned, these are
>listed below. can you confirm or add to the these.
>
>153	twist in spine and crack in far end mounting ceramic
>159	crease in tpg at far end mounting ceramic
>166	crease in tpg at far end mounting ceramic
>167	scratchs on bottom side AlO spacer.
>
>i am not sure what else is wrong with 167. these scratches i would not
>have thought failed the spine. the creases in the TPG may be acceptable if
>they do not compromise the mechanical stability of the spine. But I expect
>that you have other comments to add.
>
>thanks
>
>yours
>
>Richard
>
>  
>


    [ Part 2, Image/JPEG  58KB. ]
    [ Unable to print this part. ]


    [ Part 3, Image/JPEG  43KB. ]
    [ Unable to print this part. ]


    [ Part 4, Image/JPEG  25KB. ]
    [ Unable to print this part. ]