Select Constraint
Parallel Face from the main menu bar to apply a constraint that positions a movable instance so that a selected face is parallel to a selected face of a fixed instance. All position constraints are features of the assembly and can be suppressed or deleted using the Feature Manipulation toolset.
To constrain two part or model instances with parallel planar faces:
From the main menu, select ConstraintParallel Face.
Tip:
You can also apply the parallel face constraint using the 
tool in the Assembly module toolbox. For a diagram of the tools in the Assembly toolbox, see “Using the Assembly module toolbox,” Section 13.9.
Abaqus/CAE displays prompts in the prompt area to guide you through the procedure.
Select a planar face from the part or model instance that will move and a planar face from the instance that will remain fixed, as shown in the following figure:
Abaqus/CAE displays arrows normal to the selected faces.
When Abaqus/CAE prompts you to select the face from the fixed instance, you can select a datum plane that was created in either the Part or Assembly module. In contrast, when you select the face from a movable part instance, you can select a datum plane that was created only in the Part module.
From the buttons in the prompt area, do one of the following:
Click OK to accept the direction of the arrow on the face of the movable instance.
Click Flip to reverse the direction of the arrow on the face of the movable instance, and click OK.
Abaqus/CAE positions the movable part or model instance so that the two faces are parallel and the arrows point in the same direction. The orientation of the fixed instance remains unchanged. The effect of changing the direction of the arrow is illustrated in the following figure:
If the parallel face constraint conflicts with existing constraints, Abaqus/CAE displays an error message and cancels the operation. To avoid the conflict, you can try reversing the selection of the instance that will move and the instance that will remain fixed. Alternatively, you can delete the existing relative position constraints, apply absolute position constraints, and reapply the parallel face constraint.
