measurement report of boostec girders control after receipt

Measurement report of Boostec girdersControl after receipt

Sylvain GRIFFET, 13/12/2010

Measurements performed on the 1st and 2nd of December 2010 with the Laser Tracker LTD500

EDMS n°1108179

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Plan

INTRODUCTION

Tolerances to be checkedCoordinates systemFlatness and coaxiality

3079 girder3069 girder

Positioning3079 girder3069 girder

Perpendicularity

CONCLUSION

Measurement report of Boostec girders

Sylvain GRIFFET, 13/12/2010 2/12

INTRODUCTION

The objective of the measurements is to perform the dimensional control of the 2 Boostec girders after receipt at CERN (building 162). We measured these girders according to Nicolas Chritin plans and tolerances (EDMS n° 1098660) using the Laser Tracker Leica LTD500.Measurement conditions were correct: temperature stability of 17.3°C to 17.8°C the 1st of December and of 17.1°C to 17.5°C the 2nd of December but lack of space. We will present measurement results with an accuracy of about 10 µm rms for the flatness and coaxiality and of about 20 µm rms for the positioning.We have not fully measured again Boostec girders but only checked the important points. The objectives were to check that girders were not damaged during transport and the machining of the side plans was consistent with the measurement report provided by Boostec (EDMS No. 1107158).



Tolerances to be checked



ReferenceA

ReferenceD

ReferenceE

ReferenceC

ReferenceB

ReferenceF (Idem B)

ReferenceG

ReferenceH

ReferenceI

ReferenceA

REFERENCE A

POSITIONING319 mm

PERPENDICULARITY

PERPENDICULARITY

PERPENDICULARITY

PERPENDICULARITY

POSITIONING529 mm

ReferenceD

POSITIONING210 mm

PERPENDICULARITY

PERPENDICULARITY

ReferenceE REFERENCE E

POSITIONING1946 mm*

PARALLELISM

PERPENDICULARITY

PERPENDICULARITY

ReferenceC REFERENCE C PERPENDICU

LARITYPERPENDICU

LARITY

ReferenceB

MEDIAN PLAN

65+65 mm

POSITIONING65 mm

ReferenceF (idem B)

MEDIAN PLAN

65+65 mm

POSITIONING65 mm

ReferenceG AXIS POSITIONING

65 mmPOSITIONING

65 mm

PLANEITYOR

COAXIALITYYES YES YES YES YES YES

General tolerances of ± 0.01 mm, *Tolerances of ± 0.1 mm 4/12

Coordinates system

The coordinates system is the same that the one defined on site (EDMS n°1103378): _ Y axis = mean cylinders axis corrected by the offset generate by the cylinder diameter_ Z axis = perpendicular to the mean plane A_ System origin O = intersection of Y with the mean plane C



Flatness and coaxiality

3079 girder

_ Planes flatness : A : 18 µm rmsE : 9 µm rmsC : 4 µm rmsBg : 2 µm rmsBd : 6 µm rmsFg : 6 µm rmsFd : 4 µm rms

_ Axis coaxiality for the cylinder locations : 15 µm rms.



3069 girder

_ Planes flatness : A : 9 µm rmsE : 7 µm rmsC : 5 µm rmsBg : 3 µm rmsBd : 7 µm rmsFg : 8 µm rmsFd : 3 µm rms

_ Axis coaxiality for the cylinder locations : 8 µm rms.

For the two Boostec girders, and with the consent of Nick Gazis, the planes D, H and I were not measured again.

Positioning

3079 girder

_ Positioning of C with respect to E (along Y), distance between mean planes : 1946.073 mm or 73 µm of offset with respect to the nominal length.

_ Positioning of A with respect to Y axis (along Z): distance from the mean plane A to the Y axis of 528.935 mm or an offset of 65 µm (instead of 28µm on site). It will be necessary to measure this offset by CMM, the use of shims is possible.



_ Positioning of Bg with respect to the median plane: -64.904 mm instead of -65 mmPositioning of Bd with respect to the median plane:64.974 mm pour 65 mmPositioning of Fg with respect to the median plane: -64.976 instead of -65 mmPositioning of Fd with respect to the median plane: 64.947 mm instead of 65 mm

The Bd and Fd planes have been enough machined to allow the use of shims.

Positioning

3069 girder

_ Positioning of C with respect to E (along Y), distance between mean planes : 1946.063 mm or 63 µm of offset with respect to the nominal length.

_ Positioning of A with respect to Y axis (along Z): distance from the mean plane A to the Y axis of 528.951 mm, or an offset of 49 µm (instead of 8µm on site). It will be necessary to measure this offset, if any, by CMM, the use of shims is possible.



_ Positioning of Bg with respect to the median plane: -65.057 mm instead of -65 mmPositioning of Bd with respect to the median plane: 64.867 mm instead of 65 mmPositioning of Fg with respect to the median plane: -64.971 mm instead of -65 mmPositioning of Fd with respect to the median plane: 64.857 mm instead of 65 mm

The Bg plane seems not to have been machined enough of the order of 60µm, the CMM measurements by Boostec confirm that (EDMSn°1107158).

Perpendicularity



3079 and 3069 girders

For the two girders, and like on site, we have not detected any problem about perpendicularity between planes.

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CONCLUSION

According to the results presented here and the accuracy of LTD500, we can confirm the measurements taken on site the 28th of October 2010 (EDMS No. 1103378) for the tolerances concerning : •Perpendicularities between planes,•Flatness of measured planes,•And the coaxiality of cylinders put on the V-supports.

For the positioning, we find offsets, for the two girders, of the order of 50µm between the bottom plane A and the beam axis. It will be necessary to check that with CMM measurements because these faults are above values detected on site, however it is possible to use shims.

The machining of the side planes seems to be enough to allow the use of shims, except for the Bg plan of the 3069 girder which is above about 50 µm (that is confirmed by CMM measurements of Boostec). More accurate measurements with CERN CMM will be necessary to define shims for the side planes.

The Boostec girders have apparently not been damaged during transport.


12/12Sylvain GRIFFET, 13/12/2010

measurement report of boostec girders control after receipt

Documents

boostec edms

receipt sylvain griffet

measurement conditions

tolerances edms n

1mm412 tolerances

measurement results

axis coaxiality

y axis