How to wake midpoints to use as constraints?

BLJ_ENGINEERING

Midpoints will not wake unless I choose something new to draw e.g. a new line. I'd like to use constraints directly on midpoints but Onshape tells me; "A constraint must involve something from the sketch".
 

Did I miss something? 

Narayan_K

Firesale said:

Midpoints will not wake unless I choose something new to draw e.g. a new line. I'd like to use constraints directly on midpoints but Onshape tells me; "A constraint must involve something from the sketch".

The error "A constraint must involve something from the sketch" is because you didn't selected any entities before selecting constrain option.In Onshape you have to select sketch entity first(before selecting any constrain option) to apply constrain.

Yes, I agree with your point, mid point will not highlight/snap for dimension and applying  mid-point constrain between two lines unless we have a point.

derek_ward

@Firesale, you can place points on the midpoints of your rectangle sides, select them and then use a coincident constraint.  

Hakro

I would first create a point at the mid of each of the 2 lines, select the 2 points and then use the coincident constraint.


Or ...
Create only 1 point at the mid of one of the 2 lines, select the point and the other line and then use the midpoint contraint.

Result:

BLJ_ENGINEERING

@derek_ward and @hakro: 
Thanks, that works but I think the "wake midpoint" should be active on constraints also. Oh, and on Dimension also. A huge step-saver!
Bottom line is; I don't see any good reason for putting it to sleep:)

Narayan_K

Firesale said:

Midpoints will not wake unless I choose something new to draw e.g. a new line. I'd like to use constraints directly on midpoints but Onshape tells me; "A constraint must involve something from the sketch".

The error "A constraint must involve something from the sketch" is because you didn't selected any entities before selecting constrain option.In Onshape you have to select sketch entity first(before selecting any constrain option) to apply constrain.

Yes, I agree with your point, mid point will not highlight/snap for dimension and applying  mid-point constrain between two lines unless we have a point.

BLJ_ENGINEERING

I'll "reject" the answers above because it seems that you can not wake the midpoints for this operation. The answers do explain the best alternative though
I am sure there is a more complex reason for them not to wake. 

BTW @hakro ; nice screen caps, do you use Snagit? 

Hakro

@Firesale: No, I use Jing from TechSmith for screenshots and screenmovies..