1. MECAmaster For CATIA V5 Luca Gentini (EN/MME) 03.03.2016

2. outlook What is MECAmaster? How MECAmaster works Practice example
MECAmaster at CERN
Conclusions
Luca Gentini– EN-MME

3. MECAmaster Assembly software
3D Tolerances : Analyse and Optimise assembly architecture, process and tolerances and then master its design at lower cost.
3D Loads : Analyse with a modelisation and calculation the propagation of static loads in an assembly.
Hyperstatism : Identify the overconstraints or mobilities in an assembly and solve them.
Luca Gentini– EN-MME

4. 3d tolerances Assembly architecture, process
Geometrical quality and tolerances …
Action on the assembly
Action on the component
During the preliminary design, decrease the 3D effects optimizing :
Components interfaces (Position / Type)
Assembly process (Assembly procedures / mock-up … )
During the detailed design
Functional definition of tolerances
Specifications
Luca Gentini– EN-MME

5. Definition of tolerances
O IT
X,Y,Z
IT= IT A2 + IT B2 + minor shape error [IT A2 ; IT B1]
INTERFACE
Luca Gentini– EN-MME

6. Definition of tolerances
X,Y,Z
O IT ????
Luca Gentini– EN-MME

7. Definition of tolerances
Point 1
ITx; ITy, ITz
Plane 1
X,Y,Z
ITx; ITy
Point 2
ITx; ITy, ITz
Luca Gentini– EN-MME

8. Definition of tolerances
Luca Gentini– EN-MME

9. Mecamaster assembly Example
Put the constraints between each pieces to fix the 6 degrees of freedom
Edit the constraints inserting the drawing tolerance values
Luca Gentini– EN-MME

10. Mecamaster and catia MECAmaster works simultaneously with CATIA.
One just needs to open it when the CATIA Product is already opened. The MECAmaster’s toolbar appears in front of CATIA.
We cannot work on several products at the same time.
Luca Gentini– EN-MME

11. Mecamaster and smarteam
When we open MECAmaster, it generates simultaneously a new MECAmaster product.
Each MECAmaster constraint is considered as a CATIA shape.
At each constraint modification (for example a value modification) MECAmaster generates a new CATIA shape which must be saved.
Luca Gentini– EN-MME

12. Mecamaster and smarteam
CAT Product
ST000001_01
Analysis assembly
CAT Product
ST000002_01
CATIA Assembly
Preconized SMARTEAM structure
Analysis assembly and MECAmaster assembly should have the same Item.
It would be nice if the CATIA shapes also have the same Item of the analysis assembly.
CAT Product
ST000003_01
CAT Part
ST000004_01
CAT Part
ST000005_01
CAT Part
ST000006_01
CAT Product
ST000001_02
MECAmaster Assembly
CAT Others
ST000001_03
CAT Others
ST000001_04
CAT Others
ST000001_05
Luca Gentini– EN-MME

13. Example
Luca Gentini– EN-MME

14. Mecamaster at cern CERN IS CURRENTLY EVALUATING MECAmaster
Training: 3 days training for “specimen” people has been done (4x designers, 2x engineers, 1x GrACQ member).
Working stations: We can install MECAmaster on all computers, but we have just ONE license on a USB key.
People working on: A new fellow works on MECAmaster at 50% wt. He will work on pilot jobs to evaluate the program.
Support: Currently, there is not a MECAmaster support at CERN. Our support takes care only about problems related to SMARTEAM and program installation.
Luca Gentini– EN-MME

15. Very good to evaluate and improve the design.
(MY) Conclusions
Make a whole MECAmaster assembly of complex systems takes a lot of time.
Difficult to create constraints which simulate the reality. It does not manage the hyperstaticity.
The results must be carefully interpreted. They are not valid for qualification.
Very good for series productions. Quality manufacturing class, statistics, feasibility, etc.
Very good to evaluate and improve the design.
Only program at CERN to do this kind of calculation!
Luca Gentini– EN-MME

16. Thanks for you attention
Mecamaster at cern
Key people
USB licence responsible
Marta Garcia Carnero
161377
Fellow
Riccardo Peron
Fellow supervisor
Federico Carra Diego Perini
GrACQ reference member
Philippe Trilhe
163957
Thanks for you attention
Luca Gentini– EN-MME