Can USE do this?

SledDriver

All I want to do is USE the edges of the hole in Sketch 2, but it will not do it here.

https://cad.onshape.com/documents/f6ef7481f54a159f9381ad09/w/24086173c899c566bad8c32c/e/c5b0324009eb34afd2a30068

I can use the edges of the Part and the filet tangent line, but not the curves or the edges of the hole as it goes through the block. I realise I can construct the edge lines other ways, but it would be useful if the USE command could do this directly.

Should this work?

Cheers,
John

paul_chastell

I'm not 100% sure which edges you are referring to but I'm thinking you're referring to the silhouettes. I am able to project the various edges of the holes and the silhouettes. See: 

To create the silhouette edges first enter the Use command and then mouse over the face so that the silhouettes highlight and then select them. Like this (my mouse was over the dashed line):



Is that what you're after?

paul_chastell

I'm glad that helped @john_mccurdy. To get those screenshots I displayed the part in "hidden edges visible" mode and the orange is the default mouse-over highlighting. Then I grabbed the screen. The reason it didn't work the first way you tried is that the current workflow is to highlight the face so that the sketch knows what silhouettes to display: we don't currently have a general way of selecting visual silhouettes.

paul_chastell

You would be able to pick an edge or face through a face by using "Select Other" on the right mouse context menu to get deeper entities but silhouettes aren't selectable at all. Also, selecting a face is already handled by 'use' (which uses all the edges of the face when it is selected) so there's no way to 'select other' the face and then get its silhouettes. Hence the current behavior that we need to mouse over the face so that the selectable silhouettes show. For the most part though you can use Select Other to 'pick deeper'.

paul_chastell

A screenshot would help me see what you're trying to select. To clarify what I said in my last comment: select other will only work for edges and faces, not for silhouettes. So it is not going to help with silhouettes in this case and you need to rotate the view to be able to get to the face and from there to the silhouettes.

paul_chastell

I'm not 100% sure which edges you are referring to but I'm thinking you're referring to the silhouettes. I am able to project the various edges of the holes and the silhouettes. See: 

To create the silhouette edges first enter the Use command and then mouse over the face so that the silhouettes highlight and then select them. Like this (my mouse was over the dashed line):



Is that what you're after?

Tony_C_

You tried the slice intersect?

Tony_C_

I think the intersection command is what you're looking for.

Create a plane where you want your sketch to be and start a sketch.  Select the intersect command and pick the surfaces you want to project onto the plane. It will project the curve at the point the plane is slicing.

SledDriver

Is that what you're after?

Yes. That's exactly what I'm after. I was trying to USE the edges of the hole while viewing normal to Sketch 2, and it would not let me touch the edges in that situation. Not sue why that situation does not work - it seems like a useful thing. But at least I can USE the edges if I change my view.

To the other responses here, yes I could make a plane and to an intersection, but that seems more involved when a simple USE should do the job.

BTW, how are you capturing those screen shots with the highlighted orange bits?

Cheers all,
John

paul_chastell

I'm glad that helped @john_mccurdy. To get those screenshots I displayed the part in "hidden edges visible" mode and the orange is the default mouse-over highlighting. Then I grabbed the screen. The reason it didn't work the first way you tried is that the current workflow is to highlight the face so that the sketch knows what silhouettes to display: we don't currently have a general way of selecting visual silhouettes.

SledDriver

So OS doesn't allow selection of edges points or planes which are hidden items at the time of picking? Do you always have to rotate so that the desired pick point/line/entity is directly visible and not a greyed hidden item?

I thought maybe there was a key modifier to allow the mouse to select 'deeper' entities. It seems strange that when viewing normal to my sketch plane, and seeing visible although 'hidden' details, that I cannot select those details for USE. Maybe this is deliberate to avoid confusion?

paul_chastell

You would be able to pick an edge or face through a face by using "Select Other" on the right mouse context menu to get deeper entities but silhouettes aren't selectable at all. Also, selecting a face is already handled by 'use' (which uses all the edges of the face when it is selected) so there's no way to 'select other' the face and then get its silhouettes. Hence the current behavior that we need to mouse over the face so that the selectable silhouettes show. For the most part though you can use Select Other to 'pick deeper'.

SledDriver

Thanks for that explanation. Select other will help.

Cheers,
John

SledDriver

Well I thought Select Other would help, but I'm trying it on the drawing (attached above) with a sketch on the plane of the drawing and it does absolutely nothing. I've read the help on Select Other, and that's not helped at all. Can't find a video tutorial for select other, so I'm a bit stumped as to what you think select other is going to do. The description in the help is pretty much what I was hoping for, but when I try it it simply does nothing.

Viewing the part normal to Sketch2, I really cant understand why I am able to USE the fillet tangent line at a simple touch, but not the other lines which define the edges of the hole and the fillet profile.

Sorry to go on about this, but its so inconsistent, and your suggestion of Select Other is simply doing nothing here - whatever I click on  it just says "No Selections Found".

paul_chastell

A screenshot would help me see what you're trying to select. To clarify what I said in my last comment: select other will only work for edges and faces, not for silhouettes. So it is not going to help with silhouettes in this case and you need to rotate the view to be able to get to the face and from there to the silhouettes.