SPACE FRAME

Interface between the LGT and the IST

21/06/2011 Marco Ciapetti

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Introduction

The IST (Inner Support Tube) insertion will be done by mean of the LGT (Long Guiding Tube), once the current beam pipe will be removed

The IST inner diameter is 85mm the outer diameter is 86mmThe LGT outer diameter is 55mm + the rolling spheres. It’s

envelope is 57.6mm

There is the need for an interface between the IST and the LGT. This interface is called “Space Frame”

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IBL insertion

The macro steps of the IBL insertion will be:1. Insertion of the LGT inside the current beam pipe (ᴓ 58mm)2. Connection of the LGT to the motor and the tensioning wire3. Extraction of the current beam pipe4. Insertion of the IST + Space frame5. Connection of the IST to the various supports6. Extraction of the Space frame + the LGT7. Insertion of the IBL

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Space frame

The current version of the Space frame is a carbon fibre pipe(L = 6620mm - ᴓi = 58mm - ᴓo = 60mm) with 7 peek flanges.

Due to commercial sizes constraints (max length is 4000mm), the main pipe will be split in 2 parts and joined together with a joint (L = 300mm - ᴓi = 60mm - ᴓo = 64mm)

Among the 7 flanges, there will be 2 special flanges (the external ones). These special flanges will slightly different from the others due to the presence of stopper rings screwed on them.

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Main pipe

Joint

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Main pipe long part

Long pipe 4000mm

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Main pipe long part + short part

Long pipe 4000mm

Short pipe 2620mm

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Main pipe

Long pipe 4000mm

Joint300mm

N.B. The Joint will not be in a symmetric position with respect to the pipe

Short pipe 2620mm

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Main pipe

Long pipe 4000mm

Short pipe 2620mm

Joint300mm

N.B. The flanges will be in a symmetric position in respect to the pipe

Special flange

Flanges

Special flange

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Main pipe - detail

Main pipe

Flange

Special flange

Each flange will be glued on the carbon fibre pipe

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Flange

Ri 30.006

Ro 42.4

12mm between the flange inner diameter and the main pipe outer diameter

200mm between the IST inner diameter and the flange outer diameter

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Special flangeStopper ringᴓo = 86mm

Modified flange

3 x M3-30 screws3 x M3 nuts6 x 3-7 normal washers

Either one of the following solution could be used:1. Each nut could be weld to its washer and the washer glued to the

modified flange2. Thread directly the modified flange without the need for the nuts

and second washers

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Special flange

The stopper ring of the special flange is used for the fine positioning of the Space frame with respect to the IST.

During the insertion of the Space frame inside the IST, one of the two stopper rings is removed. The Space frame is slid inside the IST and in the end the second stopper ring is added and tighten using the bolts.

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IST

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Space frame insertionModified flange

(Stopper ring has been removed)

IST

Main pipe

Flange

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Space frame insertion

Main pipe

Flange

Special flange

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Space frame insertion

IST

Modified flange

Stopper ring

IST

Special flange

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LGT + IST + Space frame

Side C

Side A

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Front view

IST

Special flange

(Side A)

Flange

Main pipe of Space frame

LGT

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Further work

• Design and realize the connection interface between the LGT and the Space frame for the extraction of the LGT

• Realize a prototype of the Space frame in order to check gaps and clearance between the parts, and to control the response of the various material to our need

• Design and realize the interfaces with the extraction/insertion tables (intermediate table, pit table, etc.)