Sketch generation.

geoff_josey

I am new to Onshape so my questions are basic. I have watched the various tutorials on extrusions and created a long  rectangular cubic form. I am now putting holes thro it from various planes just to gain experience. 
Some times it works fine and then i find that I select a plane but cannot generate a sketch which appears in red. I am doing something wrong but cannot understand what.
On a related problem. When do you use the various extrude options eg. Thro and to next face ? Thro seems to work.

Jake_Rosenfeld

@geoff_josey

You have to leave the sketch dialog open while sketching.  Clicking the green check mark closes the sketch and the system will assume you are done sketching.  If you double click on that sketch, you'll notice that no sketch plane is selected:



So, you can double click on sketch 4, select a planar face or construction plane, and then start sketching.


There are example of all the extrude end conditions and what they do here:
https://cad.onshape.com/help/Content/extrude.htm

owen_sparks

Hi and welcome.

If you can throw up a screen grab of the error you're seeing and also a link to the document I'm sure we can help.

Details here if needed:- https://forum.onshape.com/discussion/9107/forum-post-checklist

Cheers,

Owen S.

geoff_josey

Its a Public Document "Plane Test"
https://cad.onshape.com/documents/c27988896b33391434ee832b/w/301e1bbda5f5d56c6aa21f74/e/2d1887
I have just selected Right face and tried to generate sketch4 and the problem occurs -Its in red  Thanks

Jake_Rosenfeld

@geoff_josey

You have to leave the sketch dialog open while sketching.  Clicking the green check mark closes the sketch and the system will assume you are done sketching.  If you double click on that sketch, you'll notice that no sketch plane is selected:



So, you can double click on sketch 4, select a planar face or construction plane, and then start sketching.


There are example of all the extrude end conditions and what they do here:
https://cad.onshape.com/help/Content/extrude.htm

geoff_josey

Thanks for your comments and the link. Very useful. I had missed the point you make ref clicking the green check mark.