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Seek & Destroy: Under Defined Sketches in SOLIDWORKS

Table of Contents

Search Filter is a tool that will allow you to search through your whole feature tree by name; it is located at the top of your Feature Tree. This is very useful when you’re working with complex parts or assemblies with a large tree.

In this example we’re searching down those pesky under-defined sketches. We’ll do this by searching for “sketch”.

SOLIDWORKS feature tree showing an under-defined Sketch2 marked with a minus sign
The minus sign in front of Sketch2’s name marks it as under-defined in the feature tree.

You can identify the under-defined sketches by the (-) in front of their name.

SOLIDWORKS feature tree with the under-defined Sketch2 selected
Selecting the under-defined sketch is the first step before enabling Use Fully Defined Sketches.

Now we’ll turn on “Use fully defined sketches” located in System Options > Sketch

Activating the “Use fully defined sketches” option will make it so you cannot leave a sketch without it being fully defined, therefore no more under-defined sketches moving forward.

SOLIDWORKS System Options Sketch page with Use Fully Defined Sketches enabled
Enabling Use Fully Defined Sketches here only flags new sketches, not ones already under-defined.

Note that it did not flag the already under-defined sketches. We’ll still have to go back and edit the ones that were under-defined before the “use fully defined sketches” option was activated.

SOLIDWORKS sketch editing view with a dimension shown while editing an under-defined sketch
Editing this under-defined sketch sets up the warning that appears when Exit Sketch is clicked too soon.

Now we’ll go into one of these sketches to edit it. I want you to see the notification that comes up if you try to leave a sketch without it fully defined, so I’ll click “Exit Sketch”

SOLIDWORKS warning dialog stating the operation requires a fully defined sketch
This warning appears until the sketch is fully defined, after which Exit Sketch proceeds without complaint.

Now if I were to fully define the sketch and click “Exit Sketch” it’s happy as a clam.

SOLIDWORKS sketch editing view showing Sketch2 being fully defined
Fully defining Sketch2 here removes the minus sign that flagged it as under-defined.

No more (-) Sketches!

SOLIDWORKS feature tree with no more under-defined sketches marked
A star icon in the feature tree flags the last sketch fully defined, clearing the model of under-defined sketches.

Fully Define Sketch is a tool that will automatically fully dimension the sketch that you’re in. It can be very useful with large, jumbled, copied/converted or unimportant sketches.

Let’s introduce this tool with the help of the humble Lego head. We’ll also use the Search Filter and our knowledge of (-) to seek out any under-defined sketch.

SOLIDWORKS feature tree on a Lego head model with an under-defined sketch selected
The Fully Define Sketch tool only appears while editing an under-defined sketch, like the one selected here.

We’re going to edit this sketch and finish it using the Fully Define Sketch tool. Note that this tool will not even show up unless you’re in a sketch, an under-defined sketch to be specific.

SOLIDWORKS Sketch toolbar with the Fully Define Sketch command highlighted
Fully Define Sketch is launched from the Sketch toolbar and then asks for a few dimensioning inputs.

The Fully Define Sketch tool requires some input, and with that input it will dimension how you want it to.

Entities to Fully Define: You can select to dimension the whole sketch or just part of it.

Relations: Add relations between the entities to help constrain the sketch.

Dimensions: You can edit how it will dimension (Centerline, Baseline, or Ordinate) and from where and where the tool will drag out those dimensions.

SOLIDWORKS Fully Define Sketch PropertyManager with dimension schemes set to Centerline and Baseline
Choosing dimension schemes like Centerline and Baseline here controls how Calculate places the new dimensions.

After hitting the Calculate button and liking what you see, click OK. If the dimensions are not where you want them to be, you can move them to their desired locations after clicking OK.

SOLIDWORKS Fully Define Sketch panel with the Calculate command about to dimension the sketch
Running Calculate here adds the dimensions needed before the sketch can be exited fully defined.

After organizing your sketch dimensions, click “Exit Sketch”.

SOLIDWORKS sketch shown fully dimensioned before exiting the sketch
The sketch is now fully dimensioned and ready to exit without leaving an under-defined flag.

No more (-) sketches! Look how good we are!

SOLIDWORKS feature tree on the Lego head model with all sketches fully defined
Every sketch here is fully defined, though under-defined sketches are sometimes fine for quick tests.

Please note that sometimes under-defined sketches can be okay. If you’re doing a quick demo or test than under-defined dimensions are often no pest at all.

So! If you’re being troubled by under-defined sketches, need help promoting the good practice of fully defined sketches, and need help hunting down those existing under-defined sketches, “Use fully defined sketches” and the Search Filter are here to help you!

Picture of Neil Lantto

Neil Lantto



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