How to reference construction lines from other sketches?

bruno_verachten

Hi,

I made a box, nothing fancy. It may not be the best way to build a box, but that's the way I did.
I created a sketch, a rectangle, some circles for the hosts/screw pillars, and then created another sketch for the walls (I could have gone the "shell" way).
I extruded the base, then the walls, and I now have to design holes in the extruded walls.
The problem I face is that the construction lines that could help me place accordingly these wall holes are on the first sketch (the bottom part).
I tried to add construction lines on a new sketch located on the back of the box (because it somehow "touches" the walls), but no luck, I can't seem to add a constraint on my new (blue) construction lines (in my wall sketch) in relation to my first  (grey) construction lines from the previous sketches.
I guess this should be possible, as I already managed to do it for another box (but at that time, I just did not understand how this could work).

Can anyone help?

Thanks.

larry_hawes

I think what Neil did was project/Use the 'point' from the construction line from the power plug side sketch that bisects the side and not the entire line as that line seems to be on a plane that Onshape can't 'use'.

http://www.youtube.com/watch?v=P7GT7LK77yo

NeilCooke

Of course, this is totally doable - should be no different than your previous design. As long as you can see the other sketch you can reference it.

Share your doc if you want somebody to show you.

bruno_verachten

Thanks Neil.
I'm pretty much ashamed of my document, but here it is: https://cad.onshape.com/documents/bd0aa71fccc858971abeeafb/w/0a8e2670ea3c8d1f67388ade/e/fccda905694bf934aa3650fe .

larry_hawes

I don't want to over simplify but setting the first sketch to 'show' from 'hide' on your first sketch allows those lines to be referenced from any new sketch...

bruno_verachten

Thanks Larry.
The Part Studio I'm working on is the "Top Box Part".
Thanks for your tip.
I can see previous sketches and so construction lines, but I can't seem to be able to put constraint on my new construction lines in relation to the previous ones from the previous sketches.
I get " Some of the entities could not be used. ".
What am I doing wrong?
Thanks.

NeilCooke

@bruno_verachten it’s still not entirely clear what you are trying to do?

i was able to add a coincident constraint to another sketch:



But are you trying to reference a sketch from the bottom part in a different part studio? In that case take a look at the Derived feature or maybe in-context is editing. 

bruno_verachten

Thanks Neil.

The two sketches are located in the same part studio.
You managed to do what I can't. I don't know why I get " Some of the entities could not be used. ".
I will try it again.

larry_hawes

I think what Neil did was project/Use the 'point' from the construction line from the power plug side sketch that bisects the side and not the entire line as that line seems to be on a plane that Onshape can't 'use'.

http://www.youtube.com/watch?v=P7GT7LK77yo

bruno_verachten

Thanks Larry, I think I got it now.