External Parameters in CATIA V5

Catia V5 has a powerful and yet simple way to control many parts over so-called external parameters. First you create the parameter (for instance a length) then you use it in as many parts as you like. Changing the parameter will cause all the parts that use it to be updated.

1. Create a Product and a Part called “Reference” (or anything else).
2. Go to the first level below the Part

Part Build Tree

3. Click on the f(x) icon, then on “New parameter or type”

f(x) icon

4. Change the name and give it a value

Parameter Dialog

5. In Tools/Options make sure the following options are set

Tools > Options > Infrastructure > Part Infrastructure

Tools > Options > General > Parameters and Measure

6. Copy your parameter (select, Edit/Copy).
7. Create the Part that shall use the parameter and go to the first level below the Part. Right-click on it and select “Paste special”

“Paste Special”

8. Select “As Result With Link” and OK

“With Link”

9. Here is your external parameter ready to be used!

External Parameter in Build Tree

Now you can create a sketch, add a constraint, right-click in the Value field to edit the formula and click on the linked parameter to insert it in the formula. You can also select any other parameter outside the part but it will only insert the actual value of the parameter without any link.

Using External Parameter – Step 1

Using External Parameter – Step 2