CATIA PLM Weekly Email 0743 – Linking Dimensions in a Sketch

Attn: CATIAHotline PLM’er,

I’m not sure if many of you know but I have 3 girls. They are 12, 10 and 8. My middle daughter has taken up running as something fun to do. Now I know lots of folks that when they ask me what I’m doing this weekend and I say ‘Oh I’m going on a 20 mile run on Sunday’ they roll there eyes and say that sounds like fun while inside there head they are thinking FREAK!!! But it is what it is.

I’m not writing to brag about my daughter or her running or my running. There will be loads of time to do that. But what I am writing about is this. We ran in a 5k run this weekend called the Seattle Jingle Bell Run. She of course got on the web and noticed that some people run it in costume. So she asked Dad can we do that. I said, “Definitely we can do that.” So off to the sketch book I went. She wanted to be a ornament I thought well a star is an ornament so that is what we will do.

I sketched it out and then measured her out. Then I was trying to figure out where the points of the star were going to go and I first thought Google.. but then I thought you know what I have CATIA and access to a license so here we goooo…..
I pulled up CATIA and started my Sketch.


Then using the Profile Button I sketched out a 5 Point Star.


Next I set up constraints onto each leg of the star.


So here is the Subject of the Mailer. I wanted to make each leg equal to one so that when I measured it out say 4 feet that they all would change at once. To do this it is very easy. You double click on the Constraint that you wish to edit or make the Driven Constraint. This will open up the Constraint Definition Panel


In the Constraint Definition Panel you will find the ‘Value’ area. Right Click in the White Space and select ‘Edit Formula’.


The Formula Editor Panel will popup. The Cursor will be in the ‘Formula Editor Field’. Select the Constraint that you want to Drive the other Constraint(s) and select OK.


The ‘f(x)’ will be displayed next to the value and the Constraint Definition Panel will be grayed out.


You can keep on doing that until all the constraints that you wish to drive with what ever values you want are done.


So as you can see I have all my legs Constrained as well as 2 interior angles with one angle linked to the other angle. I can now control the size of my star by changing the one value. Which I did to make it 48 inches.


Then we built the Star and It looked Fabulous. She brought smiles to 1000’s of people, had a blast wearing it and making it, and won 2nd place in the contest.