New User Dimensioning Problem

brad_strassburger146

I am new to onshape (and cad in general) so I apologize if this is a really stupid question. I am trying to add dimension to a sketch that will cut out a section of my shape, but whenever I put the dimension in, it turns red and becomes unusable. I assume this is a warning of some type but I do not know what it means or how to fix it. Can anyone please help.

NeilCooke

It's because you have constraints to a vertex, the origin and a dimension which all conflict - choose one to delete

bruce_williams

Your sketch becomes over-constrained when you have it fully defined and attempt to add another driving dimension.  See the Learning Center and help on these topics.

john_mcclary

Can you link your document so we can take a look? 

It is likely a constraint that you aren't aware of 

brad_strassburger146

Thank you so much. It is for sketch 6
https://cad.onshape.com/documents/e87695c881453a0c2d24dc83/w/e33f9b571a6d08738cc6bbf1/e/f6e4296c3d5b71c607d0e7f5

NeilCooke

It's because you have constraints to a vertex, the origin and a dimension which all conflict - choose one to delete

brad_strassburger146

Thank you so much. Such a simple solution. Sorry for the simple problem.

john_mcclary

No apologies, That's what this forum is for. Sketch constraints are a confusing concept for most people when starting out.

But like Bruce said, the learning center is full of useful lessons and quizzes.

It is highly recommended you go through some of the self paced courses. Until then, we will always be here to help.