How To Dimension A Spline In SOLIDWORKS - Javelin Technologies

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Article by John Lee, CSWE updated July 21, 2020

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What if in SOLIDWORKS you need to model a wire, tube, or other path that has a predetermined length but you’re not sure exactly what shape it will take?  A spline might be the way to go, in preparation for a sweep, but did you know that you can dimension a spline’s length?  You can, and it’s just as easy as dropping a Smart Dimension onto the spline just as you would with a line.  This trick went unknown to me for years, until needing to apply it in the middle of an exam.  Then it was a matter of trying it out to see if it would work.

Just drop a Smart Dimension on the spline and set the length

Just drop a Smart Dimension on the spline and set the length

Need to change the length?  Go right ahead and edit the dimension value:

Edit the dimension, and the spline changes length

Edit the dimension, and the spline changes length

For tube or wire, try setting the start and end location, direction, and tangency, and then removing all other spline points.  With the length set, it’s one way to fully define the spline.  A style spline is another way.

Spline defined

Spline fully defined

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John Lee, CSWE

John Lee is inherently lazy in that he prefers to work smarter - not harder. A CSWE with fifteen years of experience using SOLIDWORKS and a background in mechanical design, John has used SOLIDWORKS in various industries requiring design for injection molding, sheet metal, weldments and structural steel.

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