LHCb Pedestal Assembly

Peter Cooke

Peter Cooke 28 Feb - 1 March 2006 - VELO PRR

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LHCb Pedestal Assembly

Feet to Base Assembly Paddle Preparation Assembly Machining Inspection Summary

Peter Cooke 28 Feb - 1 March 2006 - VELO PRR

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LHCb Pedestal Assembly

Peter Cooke 28 Feb - 1 March 2006 - VELO PRR

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Feet to Base Assembly

Accurately machined fixture

Locate Invar feet to dowel and slot

Bond in the carbon fibre base (Araldite 2011)

When set, machine paddle inner profile to form location spigot 5mm deep

Peter Cooke 28 Feb - 1 March 2006 - VELO PRR

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Feet to Base Assembly

Left clamp foot – located with precision dowel

Right clamp foot – spigot 14 + 0.000 / – 0.008 mm located in precision machined slot 14 + 0.002 / -0.010 mm

Peter Cooke 28 Feb - 1 March 2006 - VELO PRR

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Paddle Preparation

Dress open end of paddle to fit drilling jig – spigot and length

Drill holes Bond in M2.5mm inserts

Peter Cooke 28 Feb - 1 March 2006 - VELO PRR

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Peter Cooke 28 Feb - 1 March 2006 - VELO PRR

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Precision Assembly Fixture

Peter Cooke 28 Feb - 1 March 2006 - VELO PRR

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Assembly

Apply thin layer of Araldite 2011 to the machined spigot on base

Fasten onto fixture Apply layer of adhesive to inside of

paddle Offer paddle to base Hold in position with M2.5mm screws

Peter Cooke 28 Feb - 1 March 2006 - VELO PRR

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Peter Cooke 28 Feb - 1 March 2006 - VELO PRR

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Peter Cooke 28 Feb - 1 March 2006 - VELO PRR

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Machining

Hold in fixture Grind substrate mounting face to

set distance from centreline

Peter Cooke 28 Feb - 1 March 2006 - VELO PRR

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Inspection Visual inspection for defects Inspect substrate mounting face on

CMM for flatness and position to centreline

Re-inspect following grinding of mounting face

Enter information in database

Peter Cooke 28 Feb - 1 March 2006 - VELO PRR

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Peter Cooke 28 Feb - 1 March 2006 - VELO PRR

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Summary

Demonstrated techniques and accuracy by building five mechnicals

Z dimension consistency Can produce one assembly per day (due

to curing time)