Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Rework V5 models

Rework V5 models

Rework V5 models

Hi All
Boy I wonder how much this posting will attract.
I have used V4 and V5 Catia for about one year and find the contrast remarkable. V4 would appear to be very easy to modify "old" models in, V5 seems to be very good at producing new models. Now when I attempt to modify documents in either version things could not be more different. V4 could not give a monkey (in the round) about dependencies between solids and 3D geometry but in V5, boy you had better wear a tin hat. Just how many dialog boxes are displayed telling you of various dependencies that require fixing? - does anyone remember the game "pick up sticks" you can't alter one thing without affecting something else.

Anyone have anything to addd?

My training in V4 & V5 Is IBM

RE: Rework V5 models

I do have the same feeling. Too much muck-around ;
I think at the first place proper stict procedures needs to be followed in V5 than in  V4 ;

RE: Rework V5 models

How long have you been using V5?

I had the same opinion for maybe 2 days after I finished my training, but once I starting using V5 in production, I changed my opinion: V5 is much easier to modify parts than V4.

One technique I use when making heavy modifications, is to start at the top of the part body tree, and right click on the first feature to be changed and DEFINE WORK OBJECT. Change that feature and then do a local update. If you get error messages - read them and fix them. If you can do a local update OK, change the next feature as the underlined work object and change it and local update it. Changing the part from the top of the tree down, helps me get through all my changes and minimizes the error messages.

A V5 modeling technique that helps: Create an open body of REFERENCE MASTER GEOMETRY containing datum planes, center points or centerlines, and other important geometry. Then when you model the partbody, use the master geometry to define everything. ie; contrain sketches to master geometry, or extrude pads to reference planes, etc. When it comes time to make changes, just edit the master geometry and the part should "magically morph" to the new design.

Haribabuaus is right: procedures need to be established and followed.

RE: Rework V5 models

Solid Modelling: Do most of you use Boolean operations as per V4?  

I ask, because V5 seems like it is designed to work without using these operations.  My trees generally end up looking like this (for a machined from solid part)

Body xxx
 Pad (for machining blank)
 Remove Longitudinal Bores
  Body xxx
   Body xxx
   Body xxx
 Remove Other Holes
  Body xxx
   Body xxx
   Body xxx
   Rectangular Pattern


In V4 the tree for this would be a lot simpler.  Is this the way most of you model (is there another way?)

RE: Rework V5 models

I agree with many of the other posts with the exeption of that V5 is any easier to modify than V4.  You can modify many features within V4 just a easily as in V5.  Something to consider within both enviroments is your modeling integrity.  My experiences have pointed me towards using the boolean operations on larger files, mainly because you can manage the degree at which operations fail.  I look at booleans as groupings of geometry, and in doing so I have been able to minimize failures to lets say 10 items vs. the 60+ you could face with fillets being referenced to drafts that have been deactivated.  

A bigger challege I've run into is the difference in modeling tolerance, V4 being .01 and V5 being .001.  Tangent surfaces in V4 are whacked in V5.

Good luck with the developement of your V5 methodology.

RE: Rework V5 models

I agree with Bsurf!

Limit booleans to only when you must use them, and do use them to group design features of larger, more complex parts.

50% of the lines in Roseda's example are unnessary.

RE: Rework V5 models

jackk, please can you spell out how you would create the same tree.

RE: Rework V5 models

I'd do something like this, Roseda:

Body xxx
 Pocket (sketch contains hole circle and mirrored circle)
 Rectangular Pattern (of just the last hole)

My guess is simiplier trees result in faster processing, and easier understanding for the next person who works on this part.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close