We recently looked at some of the powerful part mold analysis tools that are available in Creo Parametric. In this tip, we’ll show you how to fill loops on a parting line. If you’re working with a reference part in a mold assembly that contains holes, you need to cap them before you can split the mold. Here’s how:
- Hide the workpiece so you can collect surfaces on the reference part efficiently. To do this, in the Model Tree, right-click the work piece and select Hide from the pop-up menu.
- On the reference part, locate the holes that need to be capped.

The holes within the red circles need to be capped in order to split the mold.
- On the Parting Surface tab, click Shut Off.
- Select individual surfaces around the hole(s).

Select the surfaces around the hole.
- On the Shut Off menu bar, select the check box titled Close all internal loops.
- Select the Accept (check mark) button to apply the changes.

The holes are now capped (shown in orange).
To see a demonstration of these steps, check out this video on PTC Univerity’s Learning Exchange. You may need to create a PTC University Learning Exchange account if you don’t already have one. But the good news is that with a login, you’ll have access to hundreds of in-depth demonstrations and tutorials for PTC products.
To learn more, read the Creo Help Center page, About Filling Loops in a Parting Surface.
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About the Author
Bettina Giemsa
I graduated from Ruhr University in Bochum, Germany, with a Master of Arts in American Studies, Japanese, Economics * Started my career in Marketing on the agency side, spending almost 3 years in media planning * Ran Marketing at ITEDO Software GmbH, Germany from 2001-2006 where I first got in touch with the CAD business * Became part of the PTC Marketing organization when ITEDO was acquired by PTC in October 2006 * Currently, I work in PTC Customer Success, focusing on PTC University’s global Marketing program. Last, but not least, I am the mother of 2, enjoy running, riding and rock music among many other things.