PS/SPD VFE Electronics Boxes Repairs

Philippe Jacquet, Pascal Perret, Guy Reinmuth

LPC Clermont

23 October 2007

Pascal Perret - LPC Clermont 2

A lot of screws have been damaged when opening/closing of boxes …

1T 2T 3T 4T

1B 2B 3B 4B

Threadingdamaged

Brokenscrew

Threadingdamaged

Brokenscrew

5T 6T 7T 8T

5B 6B 7B 8B

Threadingdamaged

Threadingdamaged

Brokenscrew

PS C-side

PS A-side

Pascal Perret - LPC Clermont 3

A lot of screws have been damaged when opening/closing of boxes …

1T 2T 3T 4T

1B 2B 3B 4BThreadingdamaged Broken

screw

5T 6T 7T 8T

5B 6B 7B 8B

SPD C-side

SPD A-side

headScrewdamaged

16 mm screw!Pipe marked!

Threadingdamaged

Threadingdamaged

Pascal Perret - LPC Clermont 4

Repairs

Repairs done before magnet test! Access very difficult for SPD

Scaffolding not very stableToo far from VFE boxesM1 beam is in the way for milling tools …

2 screws not repaired …SPD SM5 topSPD SM7 top

Some “helicoils” installedMore fragile …

Be careful!

Pascal Perret - LPC Clermont 5

Remarks & Advices

M3 screws, 10 or 12 mm long to be used A lot of screws have been damaged when using a worn tool…

or screw to hard …

Damaged threading comes from screwing not right

Pascal Perret - LPC Clermont 6

Remarks & Advices

Use allen keys in good conditions: if not don’t hesitate to change it or repair it!

Apply small strength to screw: use small part of the key … Change screws each time you open a box 2 people are needed to close the cover (top) in order to

maintain, push and screw properly (good access is needed!)! Marks have been put on covers (except SPD A top):

If you feel it is too difficult, don’t do it: ask for explanation or an expert …

More info in attached files

2T 3TScrew in the order 1 – 6

Push the cover according to the arrow directions