In this post, I’m celebrating another Onshape CAD mystery solved! You see, time and again I was left scratching my head as to the mystery of why my nicely and precisely placed dimensions kept disappearing when building up my 2D sketch sections in Onshape! Before me was the case of the “Disappearing Sketcher Dimensions” (DSD). Yep, and I’ve not so single-handedly solved the case of the dreaded DSD. Fact is, Ole SkillCoach did his due diligence and “kept his ear to the ground” and “eyes on the picks and clicks” while working my way through the Onshape online Learning Pathway materials. There I learned that it matters a great deal which entities you’ve selected to create your dimensions. For example, choosing to place a dimension based on a line segment vs. the line’s endpoints often will result in the dreaded DSD once you begin to trim away unwanted portions of lines. Wham! Just like that, you’ve lost the beauty and parametric power of your carefully laid out dimensioning scheme. But not to worry. Now that I’m one step closer to achieving Onshape modeling proficiency, you can be too. Have a look at the video I’ve posted to my Vince Haley_SkillCoach Youtube channel. I’m confident this little nugget of Onshape sketcher modeling truth will help you on your way to capturing your design intent and in building more robust parametric 2D sketches. Enjoy.

YouTube video

What You Will Learn

My aim through this CAD tutorial snippet is to demonstrate Onshape sketcher behavior related to dimensions. By the end of watching the video you’ll know how to:

  • Modify 2D sketches
  • Create dimensions using lines and/or vertices
  • Use the trim tool
  • Hide and Show sketch constraints
  • Use the fillet tool
  • Dimension your 2D sketch sections more intelligently


Until next time, keep learning!


Vince has worked as Studio Engineer for consumer and medical product brands such as Whirlpool, Newell and ResMed Ltd. Australia. He's garnered 39+ patents and has designed everything from totes to toasters, and fiddles to furniture. He enjoys all things 3D and has carved out a niche as a Class-A Surfacing Guru. Active in both industry and academia, Vince serves as a Creative and Technical Skill Development Coach providing hands-on training and workshops pertaining to CAID/CAD. Vince relishes opportunities to keep learning and sharing what he's learned!