Welcome to the Onshape forum! Ask questions and join in the discussions about everything Onshape.
First time visiting? Here are some places to start:- Looking for a certain topic? Check out the categories filter or use Search (upper right).
- Need support? Ask a question to our Community Support category.
- Please submit support tickets for bugs but you can request improvements in the Product Feedback category.
- Be respectful, on topic and if you see a problem, Flag it.
If you would like to contact our Community Manager personally, feel free to send a private message or an email.
Comments
Zoom out:
But I get this and the connection of the circle and curve (after cutting the down-part of the circle):
@NeilCooke Has this bug been looked at since June 2019?
https://cad.onshape.com/documents/1dc31ec0617759f1ad29162f/w/8efa318f66b229012d883ec4/e/59f3871d8c7cb810700cb4eb
@NeilCooke Thanks for the answer.
More detailed, my situation: I have a lever (drawn inc fillets). The lever sinks into a part, and needs to rotate about 50 degrees.
The base has a 0.2mm clearance wrt to the lever.
Creating the fillets in parts is a good option, but because of the offset & clearance I prefer using fillets in the sketch.
In the document you can see the double points as described above after cutting the lower part of the circle in sketch 2.
Now I can't create the 0.2mm offset....
PS. Perhaps there are other solutions for this particular situation, however, I came across the limited "precision".
As you mentioned, of course there is a maximum of points to render.
However, when making cuts or edits in drawings, then I would expect onshape to use parametric data?
Thanks!
Your white piece is a squared shape inside of the arc.
see this exaggerated image:
The fillet's endpoint will not touch the arc.
You "use" the fillet of the white arm's sketch, so the fillet is still full length in your new sketch. You will need to trim there as well to remove that artifact.
If you follow through with your trimming it would look like this:
I definitely vote for tessellation-setting in sketches. We are only talking 1/10ths of millimeters here..
It will avoid these kind of mistakes.
For example, the piece in between, rendered at a different location than the actual curve:
Solidworks will improve tessellation as you zoom in with drawings, but that ends up being a huge lag monster when zooming in and out.
Of course you can't just increase the tessellation all of the time, because even the dumbest models could kill your speed.
Its a fine balance between pretty and functional. So is the limit of digital technology.
I actually get better tessellation and performance in Onshape than i do in Solidworks, so they are doing something better than the competition in this regard. Not bad for something that can run on a cell phone.
Though I do like the AutoCAD option: regen on request.
Something for Onshape then as well?
I believe this is more than a graphic error. I use these lines as machine tool paths. When the machine follows these lines, it does not move in a smooth circular manner, rather it segments its path and it becomes very choppy… Not good for the machine, and not good for the part's quality.
We do not have these problems with other CAD systems (Rhino), and we are forced to use Rhino over OnShape, which is unfortunate because of the Cloud and other benefits. Please fix these segmented archs before my team changes everything to Rhino.
That seems odd… Most of the discussion is about display quality when zooming in except for the last bit about STL.
Didn't see this discussed before but you can turn on "high quality" mode using the shift+R shortcut to force the higher quality display. However this won't have any effect on what's exported…
What format are you exporting to your machine?
In my experience, the tesselation setting don't have any effect on sketches and curves, they only affect parts. I've seen this or a similar issue last week, and it is a bit odd and not always reproducible. On one model, the curve segementation changed after some time, for example. I was working on a small (sub-millimeter) detail in a sketch, and points wouldn't match an arc. After I worked on another region of the sketch, and came back to the problematic area, the segmentation was suddenly much better, so I thought I might be able so solve it right now, but when I started working on it, it became worse again. It feels like there might be some auto resolution at work, which doesn't always do the right thing. I the tried to reproduce it with a sample part I coud share, but it didn't work.
I've had a similar discussion with the dev team at ansys years ago. It lead to implementing a tweak, where the number of max. segments an arc was calulated in (and as mentioned by @NeilCooke earlier in this thread, can only be so large and has to be defined somewhere), was made dynamic and referenced to the current zoom level. That way, even watchmakers can now see circles instead of poligons.
are you using rhino files directly for cnc? Or exporting to another format that your cnc reads.