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"Same same, but different" or WTF with arks
evgenii_fyodorov
Member Posts: 6 ✭
So, I want to put an arc in my sketch. I have a center point, I have a point where I want to start this ark and where I want to end it. So I use the center point arc tool and watch how half of my sketch get's lid in red, like so:
But when I do literally the same thing, but instead of ending ark in one of those two points, I continue the arc just a little bit further - everything is ok, sketch resolving correctly:
And that would be fine except that now I'm getting a loose end in my sketch. Which makes me a bit annoyed.
As far as I can see, it does not matter which direction the arc is made - the result is always the same. It precisely passes through both point 1 and point 2, but everything resolves correctly only when I get it past the ending point.
I acknowledge that I did not use any courses to teach myself CAD. I prefer just to dive right into making something. And when I eventually get stuck on something that I don't know how to resolve or how to do, the trial-and-error method (with a bit of heavy swearing) usually does the trick. But this time, I can't explain what's happening to Google well enough to get to the answer.
Thanks in advance for wasting time on my problems)
https://cad.onshape.com/documents/212f3144157fe77975f92f73/w/cf2d9021a4958718c308cf82/e/2f9467bf56600dd6362b8911?renderMode=0&uiState=697df61170507c976b079296
Comments
That is strange. I can't comment on why it's red. But since it works if you go past the point, what if you just use the Trim tool to trim off the loose end?
If that doesn't work then probably something is not lining up the way that it seems.
CADNurd's Linktree - find me everywhere else - https://linktr.ee/Liam.G
I'd suggest experimenting with different 'Workspace Units' - yours are currently set to meters which can't help with accuracy.
CADNurd's Linktree - find me everywhere else - https://linktr.ee/Liam.G
Yep, Trim does not work.
Initially, I set workspace units to be represented by the SI standard, like in physics. So, given that a millimeter is 0.001 of a meter, it is not surprising that when I switched to millimeters, the result is the same. But, I must admit that writing "0,00" before all my values is kinda tedious, at least at the start.
Millimetres are also SI units. It's not surprising that your sketch is having difficulties solving - why are there so many short, unconstrained lines? The general rule of thumb is to keep sketches simple with no more than 20 entities or so.
Can I forward your comment to every undergrad engineering CAD professor? There's this tendency to show students final drawing views of fully finished products with hundreds or thousands of lines and dimensions and conflate that with master sketch modeling practices. It's probably the thing I see done most often that slows down new hires fresh out of school and some people carry that practice into industry for way longer than they should.
Derek Van Allen | Engineering Consultant | Meddler