We started you with part 1 of our ‘Editing Existing Assembly Constraints‘ blog last week so now lets jump into part 2! Change the constraint from a Mate to a Flush by clicking the Flush button in the Solution section and then click OK. You will know that the error with the constraint has been corrected because the Design Doctor icon turns gray. Right-click in the browser and select Undo Isolate from the context menu.
To change just the value of a constraint, take the following steps:
1. Select the constraint. Click Flush: 10 listed under Channel – Base: 1 in the browser.
2. At the bottom of the browser, the offset distance appears in an edit window.
3. Resist the urge to click in that edit box. The value is selected for you already, so all you need to do is enter a new value.
4. Type a new offset distance of 2 inches and press ENTER.
Notice two things that happen: the model updates and the value is re-selected for you and awaiting your next entry.
Another way to edit a constraint value is to double-click the constraint in the browser. Double-click Flush: 10 and the Edit Dimension dialog box appears. Again, Inventor highlights the value for you. Enter the new offset value of 0 and click OK. The Edit Constraint dialog box can also be used to change a constraint’s input and type.
Right-click Flush: 10 and select Edit from the context menu to open the Edit Constraint dialog. Change the constraint back to a Mate constraint by clicking the Mate button and then click OK.
A dialog appears and provides several options to correct the invalid constraint that you just entered. Click to accept the constraint, and three things happen. First, a warning symbol appears next to the constraint in the browser. Second, the Design Doctor icon turns red, indicating a problem with the assembly. And third, the suffix of the constraint changes to 11.
Click Undo to reset the constraint back to its correct setting and switch to the Stapler assembly.
You can also edit an angle constraint. Expand Upper: 1 in the browser. Right-click Angle 1 and select Edit from the context menu. The Edit Constraint dialog opens. Change the Solution setting from the Undirected Angle to the Explicit Reference Angle. Notice that the selection button three automatically highlights. Select the Negative X Side of Upper in the silver area. This way, Inventor knows the absolute angle since three vectors have been defined. You should use the Explicit Vector option when applying Angle constraints to ensure that the angle will not unintentionally flip 180-degrees.
Change the Solution setting to the Explicit Reference Angle and notice that button three automatically highlights.
Expand the dialog box by clicking the More button. Select both of the options Use Angle As Resting Position and Maximum, then set the Maximum value to 230 °. Also select Minimum and set it to 178 °. Click OK.
Drag the Upper assembly in the window. Notice its motion is limited, and when you let go, it snaps back to the defined resting position.
To make it easier to see which part of the components are affected by a constraint, the two participants of the constraint relationship highlight with different colors. To help locate the participants in a constraint, use the Isolate option from the context menu of a constraint.
Join us next week for even more Autodesk Inventor tips!