MECAmaster
For CATIA V5
Luca Gentini (EN/MME)
03.03.2016
Luca Gentini– EN-MME
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What is MECAmaster?
How MECAmaster works
Practice example
MECAmaster at CERN
Conclusions
Luca Gentini– EN-MME
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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
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…
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Assembly
architecture,
process
Geometrical
quality and
tolerances
Action on the component
Action on the assembly
During the preliminary design, decrease the 3D
effects optimizing :
• Components interfaces (Position / Type)
• Assembly process (Assembly procedures /
mock-up … )
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During the detailed design
• Functional definition of tolerances
• Specifications
Luca Gentini– EN-MME
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O IT
X,Y,Z
IT= IT A2 + IT B2 + minor shape error [IT A2 ; IT B1]
INTERFACE
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X,Y,Z
O IT ????
Luca Gentini– EN-MME
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Point 1
ITx; ITy, ITz
Plane 1
X,Y,Z
ITx; ITy
Point 2
ITx; ITy, ITz
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Put the constraints between each pieces to fix the 6 degrees of freedom
Edit the constraints inserting the drawing tolerance values
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Luca Gentini– EN-MME
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•
MECAmaster works simultaneously with CATIA.
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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.
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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.
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CAT Product
ST000001_01
Analysis assembly
CAT Product
ST000002_01
CATIA 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
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 Others
ST000001_05
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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.
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- 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!
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Luca Gentini– EN-MME
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Key people
USB licence responsible
Marta Garcia Carnero
112 03-008 161377
Fellow
Riccardo Peron
376 01-001
Fellow supervisor
Federico Carra
Diego Perini
376 01-012 167465
112 02-013 163284
GrACQ reference member
Philippe Trilhe
112 02-003 163957
Thanks for you attention
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Luca Gentini– EN-MME
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