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Sketches not fully defined and I... admittedly don't understand constraints yet.
christopher_leffel
Member Posts: 5 ✭
Okay, I'm at a loss for what I'm doing wrong here in that my sketches aren't fully defined. I get that it has something to do with constraints and possibly mate connectors, but I have no idea what I have to do to fix it. I see all kinds of discussions on WHY parts need to be fully defined, etc., but I'm finding exactly nothing telling me HOW to fix it. A clear explanation of what steps will actually resolve the error would be much appreciated!
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Answers
Have you done any of the fundamental training from learn.onshape.com? You might find it helpful to learn what constraints do what and how to adjust them.
so when you define the length, width and radii of your geometry, the shape is fully defined. but the position is not!
the lower line is black and so it's probably constrained vertically, but the end vertices are blue so they can probably move horizontally still.
so you may be one (horizontal) dimension/constraint away from fully defining your sketch…
No.
I am coming at this from rusty experience with AutoDesk, 3dsMax, Maya and the like.
If someone could even just get me pointed in the right direction to what/where I need to click in the interface - I honestly don't have time to go through a bunch of random courses to finally find the one piece of information or series of steps I need. I tried reading forum posts, tried finding a relevant video (though I'd really prefer text)… but… even a link just to the right training for the question at hand…
'Anchor' your sketch by intersecting a point in it to the origin or by dimensioning a point in the sketch to the origin. In the future, consider starting the first element in a sketch at the origin. - Scotty
simply searching for fundamentals or constraints at that website would likely yield you an answer that would pay dividends down the road. if you really want to shortcut it and the the blue dot is a real hindrance…. just select everything and click on the fix constraint. 90% of the time this questions comes up its related to Scotty's comment, you haven't told the program where you want the sketch located in relation to existing geometry.
I'm unable to determine why this is not fully defined. Everything has a constraint or a dimension, per the tutorial I'm following, but it's no go. What's the element I'm missing?
The angled line with the 35 dimension is not aligned horizontally or at a specific angle. It's also not going through the center of the circles. in other words, there's not a lot really constraining the size of the whole thing.
Simon Gatrall | Product Development Specialist | Open For Work
It looks like you've not constrained anything "vertically" to existing geometry/elements.
Maybe a tangent constraint would help
@bruce_price ,
Just grab a corner (or anything blue) and start dragging slowly with the mouse and see what moves, it should help understand what is "unconstrained".
Off the bat, I can see you're missing a dimension for either the large circle or the small circle (your pick)
+1 this is the way to go
The BEST way to determine whether or not you've fully constrained a sketch (besides blue vs black/white) is to drag some of the blue points/lines around. Do they change in an unexpected way?
Ramon Yip | glassboard.com
I like the 'cookie-cutter analogy' when it comes to sketch constraints. An un-dimensioned, un-constrained sketch is like a cookie-cutter made out of some sort of stretchy rubber; unpredictable and therefore useless.
I thought that if I constrained the circles to the rectangle parts, that would constrain the circles. Fix the suggestions, and I'm now I'm fully constrained. Thanks for the quick assist. Now it's on to the next stage.
Here's another constraint issue
Everything seems to have a measurement but ?
Blue fillets are not tangent - add a tangent constraint