Tips & Tricks: Sketch-based Features

Sketch-based features available in PTC Creo Parametric allow you to quickly draw and edit geometry. When you drag elements of a given sketch, multiple dimensions change automatically. For example, if you drag a corner, the angle of the corner changes, along with the length of lines that intersect with the corner. This means you can change the sketch really quickly. However, in dragging elements of the sketch, you often don’t get the dimensions exactly how you want them.

Here’s how to change dimensions of sketch-based features with more precision:

Entering the sketch environment

First, did you know that when you are entering sketcher during new feature creation you can bypass the typical section orientation constraint step that you generally go through in PTC Creo Parametric? To do this, follow these steps:

  1. Select a sketch-based feature (for example, click Model > Extrude).
  2. Select a plane or surface.

The system automatically chooses a valid section orientation reference, which you can change later if you want.

For more about entering Sketcher mode, check out this Help Center page.

Changing dimensions on a sketch

You can change your dimensions on your sketched feature with a bit more precision using dimension draggers (the open triangles at the end of a dimension) or by replacing a certain dimension value with another.

Image: A dimension dragger is shown within the red circle.

You can change dimensions on a sketch-based feature in Sketcher mode or in Feature Preview mode.

To change a dimension of a sketched feature, follow these steps:

  1. If you are in Feature Preview mode, right-click on the model and select Show Section Dimensions. The feature’s dimensions appear, as shown below. If you are in Sketcher mode, you can skip this step.

Image: Within Feature Preview mode, right-click and select Show Section Dimensions to view all of the sketch’s dimensions.

  1. Either…
  • Click anywhere on the sketched feature and drag it.
  • Double-click on a dimension, and then type a new value in the field to change that isolated dimension.
  • Select a dimension dragger and move your mouse to change that isolated dimension.

Notice that dimension editing functionality is not only available within the sketch environment; it is also available when the Feature Preview function is enabled.

When you click a dimension dragger and move your cursor or when you replace a dimension value, only that specific dimension changes. The sketch’s other dimensions are forced to remain locked.

To watch a demonstration of these steps, watch this video at the PTC University Learning Exchange (you may need to register, if you have not already.)

To learn more, read the PTC Creo Help Center page, About Dynamic Movement of Dimensions.

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Flow visualization devices by user community contributor mbonka