Hi Blaine

You need to add sketch relations to control how your sketch works - the green boxes

2018 SOLIDWORKS Help - Sketch Relations Overview

I have mine set to add automatically- here horizontal and vertical, note the diagonal dim is grey (driven)

so it will update if I do this

It also depends where you dimension to and from..

for example you can dimension between two lines which will infer parallel (if they are that way to begin with)

or you could dimension between two end points

or just click on a line

and these will all exhibit different behaviours.

it can be confusing to start with but you'll soon get the hang of it.

What you want to do is turn your sketch black, the blue lines mean the geometry is not fully defined.

Here I added a coincident relation with the origin and you can see all is black

What shape are you trying to make? If you want a rectangle then you have too many dimensions - it will be overconstrained.

If I turn the diagonal dimension to driving,, look what happens

ugh!

but if I remove the vertical relation

and then change its value

I end up with what you posted.

Hope that helps

Hi Blaine Geer ,

If you have the correct answer, please mark it as "true".

It will be good for people with similar problems.

Thanks a lot.

First off the 58.31 is a driving dimension. Second you probably do not have a vertical relation on the vertical lines otherwise you would would get an error when changing the 50 dimension to 60. Third you also probably added your 50 dimension by selecting the lower horizontal line (not good if you import dimensions into a drawing). Only a guess since I cannot look at your model.

Hi Blaine

You need to add sketch relations to control how your sketch works - the green boxes

2018 SOLIDWORKS Help - Sketch Relations Overview

I have mine set to add automatically- here horizontal and vertical, note the diagonal dim is grey (driven)

so it will update if I do this

It also depends where you dimension to and from..

for example you can dimension between two lines which will infer parallel (if they are that way to begin with)

or you could dimension between two end points

or just click on a line

and these will all exhibit different behaviours.

it can be confusing to start with but you'll soon get the hang of it.

What you want to do is turn your sketch black, the blue lines mean the geometry is not fully defined.

Here I added a coincident relation with the origin and you can see all is black

What shape are you trying to make? If you want a rectangle then you have too many dimensions - it will be overconstrained.

If I turn the diagonal dimension to driving,, look what happens

ugh!

but if I remove the vertical relation

and then change its value

I end up with what you posted.

Hope that helps