An Introduction to Autodesk Inventor iLogic - Part Three
Create Rules in the Assembly

Let’s begin to write this iLogic rule. Create a new rule named “port_b_rule”. Populate the rule as follows...

The first thing that we’ll do is decide whether we’re making a tee style block, and remember that in a separate variable. We’ll then use this variable later to set other parameters.

We’ll use the value of the isTee variable later – it holds a True or False value to indicate whether we are making a tee manifold.

We are now going to add lines to our rule that will turn off the constraints that locate the union and union screw when the manifold block is an elbow, and turn them on when we’re making a tee style. Notice how we can use the isTee variable to turn these constraints on or off according to the value of the block parameter.

Notice how specifying the names of these constraints has made it easier to refer to them in this rule. Also keep in mind that you can use the model tree information provided on the Components tab of the rule editor to help fill in the names of the constraints.

Next, we add two additional lines to conditionally include the Port B Union part, and corresponding screw pattern:

These both use the same “isTee” variable used previously. When the screw pattern is suppressed, the screw component itself is also suppressed.

Next, if we are using a Port B, we need to set the port size, the parameter values that control the screw pattern, and the Port B union part number.

Don't close the editor, more on next page...