How do I project a loft beyond the last face?

sam_hall489

Hi folks,

I still consider myself very new to CAD modelling and OnShape and I'm a bit stuck (have searched but can't find an answer to this).

I've got two simple sketches of partial circles that are 800mm apart and I've lofted between them. What I'm trying to do is extend the loft another 70mm beyond the second sketch so that the tapered profile is maintained. I know the cross-sectional dimensions at the points of the two sketches but not at the point I want to extend to.

Is there a way to project the loft beyond the final sketch or do I really have to resort to some complicated maths to work out the dimensions of the new face at 870mm and draw it that way?

The line in sketch 3 is the path I'd like to loft to follow. I did try using the "path" and "guide" options but the loft still stopped at the second face.

Would really appreciate any help. Thanks.

https://cad.onshape.com/documents/50106ae45932c8bfc719fde6/w/2b77fad3d2a34d59b1eb77b4/e/f1a5df782646c4af58d969a2?renderMode=0&uiState=6700d49a302a9f799ef2ee1b

Jed_Yeiser

Hey @sam_hall489 - the tool you're looking for here is 'Move Face'. This will essentially 'extend' your lofts exactly as you're describing. I've created. a quick copy with these features here. You can find the 'Move Face' tool by typing 'Move Face' into the search bar, or locating it in the toolbar.

It may be worth taking a look at some of the intro to CAD and Onshape courses available here. Even for those of us that spend a good deal of time in Onshape will regularly find out about new features or better ways to achieve a given task.

Cheers,

-j

Jed_Yeiser

Hey @sam_hall489 - the tool you're looking for here is 'Move Face'. This will essentially 'extend' your lofts exactly as you're describing. I've created. a quick copy with these features here. You can find the 'Move Face' tool by typing 'Move Face' into the search bar, or locating it in the toolbar.

It may be worth taking a look at some of the intro to CAD and Onshape courses available here. Even for those of us that spend a good deal of time in Onshape will regularly find out about new features or better ways to achieve a given task.

Cheers,

-j

rick_randall

@sam_hall489 I tried the move face method described above,but had some unexpected results. As a second alternate method, Use rollback bar,and create an offset plane, where you want to extend the loft - then go to the sketch (of the face you want to move) and edit the sketch plane to this new plane. Be mindful of parent child relationships. This method may or may not work depending on the complexity of your loft, but did work on a relatively simple loft. Others may have better ideas.

sam_hall489

https://forum.onshape.com/discussion/comment/107894#Comment_107894

@Jed_Yeiser thank you very much this is exactly what I needed. Much appreciated.

I do find "move face" a little counterintuitive though. I'd actually seen that button but dismissed it as I don't want to move the face I wanted to project it. Move face implied to me that it would move the face my sketch was on by 70mm. Maybe that's just me.

Thanks again!

sam_hall489

https://forum.onshape.com/discussion/comment/107907#Comment_107907

Hi @rick_randall. Thanks for taking the time to have a look. Move Face did what I needed in this instance but as per my comment above I do find it a little counterintuitively named. So much so that I'd already dismissed it as not being what I needed. If I need to do anything more complex I'll certainly take a look at your approach. Cheers.

sam_hall489

https://forum.onshape.com/discussion/comment/107894#Comment_107894

Oh and thank you for the link to those courses. I'll definitely check them out!

rick_randall

Sam, after rereading your post, I see now what you are trying to accomplish - And yes, "move face" is what you want.