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How to Dimension While Sketching in SOLIDWORKS

How to Dimension While Sketching in SOLIDWORKS

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Tired of constantly dealing with the Smart Dimension tool? For nearly every new SOLIDWORKS user I meet, there exists a constant struggle of turning Smart Dimension on, remembering to turn it off, and making sure all your selections are correct for even the simplest of dimensions. Fortunately, there’s a better way that will have you typing in dimensions without ever leaving your sketch tool.

Managing System Options

It all begins in System Options in the Sketch category. To access System Options, click the gear icon in the Standard Toolbar at the top of your screen:

Simple black outline icon of a gear
A gear icon marks this tech tip on dimensioning while sketching in SOLIDWORKS.

From here, select the Sketch category (highlighted in blue below) and enable the option labeled “Enable on screen numeric input on entity creation.” Additionally, ensure that the sub-option beneath it is enabled as well. Otherwise, dimensions will be added to everything you sketch, even if you don’t type in a value. That’s all there is to it!

System Options Sketch page with Enable on screen numeric input on entity creation checked
Enabling on-screen numeric input lets you type dimension values directly while sketching.

Dimension Options

Now, when sketching a line for example, a popup box will appear next to your cursor, allowing you to type in the desired dimensions. Once you’ve input a value, simply press Enter on the keyboard to create both the sketch entity and the associated Smart Dimension. Additionally, if the sketch entity is aligned to capture any automatic sketch relations before pressing Enter, they will be added as well. By default, no dimension is added if a value is not typed in.

Short sketch line drawn on a blank canvas demonstrating the on-screen dimension entry point
This option skips certain entities, such as splines, polygons and ellipses, which need normal dimensioning.

Like most great things in life, this option comes with a few caveats. First, it should be noted that this option does not work for all sketch entities, including splines, polygons and ellipses. Additionally, the option only provides one dimension preview for each sketched entity. For example, if a line is drawn at an angle, only the overall length may be dimensioned, whereas a point to point horizontal/vertical dimension or angular dimension may be required. These dimension types will often still require the use of the Smart Dimension command.

Finally, if you have been using the A key to automatically transition from a line segment into tangent arcs, this functionality will no longer work with this option enabled. Instead, hover the cursor over the endpoint of the previously-created line, then move the cursor away in the direction of tangency. This will produce the same result as the A key.

Sketch cursor icon shown while dimensioning a newly drawn sketch entity
Enabling this option early on any new SOLIDWORKS install speeds up everyday sketching and dimensioning.

“Enable on screen numeric input on entity creation” is an option I enable early on any new install of SOLIDWORKS. With a bit of practice, it should have you sketching and dimensioning faster than ever before!

Sketch cursor icon closing out the tech tip on on-screen numeric dimensioning
This System Option is one of several favorites worth enabling on a fresh SOLIDWORKS install.

We hope you enjoyed this quick tech tip! Do you have any favorite System Options in SOLIDWORKS? Let us know in the comments! For more information on SOLIDWORKS or if you have any questions, contact us at Hawk Ridge Systems today. Thanks for reading!

Picture of Jacob Ames

Jacob Ames

Jacob Ames is an applications engineer for Hawk Ridge Systems in Bothell, WA, specializing in SOLIDWORKS 3D CAD, Simulation, and 3D Printers. Before joining Hawk Ridge Systems, Jacob earned degrees in mechanical engineering and aeronautics from MIT with a focus on renewable fuels. If he's not teaching class, you'll probably find him playing video games with friends or tearing up some trails on a dirt bike.

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