How to Fully Constrain a Sketch in Fusion 360 Tutorial
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- Опубликовано: 14 июл 2024
- How to fully define a sketch in Fusion 360 before you start modeling. It is important to use constraints and dimensions to fully define your sketch so there are no surprises later in the modeling process.
that cleared a lot of things up! cheers man!
Glad it helped 👍
As a beginner i found this very useful. Thank you
Glad it helped constrain sketches in Fusion 360 👍
Your explanation of what it takes for a sketch to be fully defined was very clearly explained. I could not find a simple answer. It was literally explained when you said that we still don't know WHERE it is in reference to the origin. As soon as i did this, it immediately turned all black. THANKS A MIL!
Glad it helped
Helpful!!
Glad it helped 👍
I assumed the green line for starting a line would line up with origion... it does not. I have also drawn a line off origion and set the line vertical and it still does not constrain. there are some parts of fusion that allow you to assume a relation but when tested they do not.
Yes, sometimes it can be confusing, the worst is when a sketch won't constrain because of some random point on a line
sometimes a line still blue, it results not movable, and you finish the fantasy about which constraint is missing. Especially when multiple arcs ar involved etc. I would like to have a tool that states "hey: these following constraints are missing" (perhaps there is but I'm not aware about). Indeed I still have some sketch with all black lines but there is not the lock on the sketch. So I have not clue what's not cosntrained.
For when you have black lines in a fusion 360 sketch but still no lock, often, there is a single point along the line that makes the line into two points and that point is not defined or constrained, one way to do this is to occasionally delete a black line and then you might discover it was really two lines, you can then always undo quickly and try it with a different line until you find the one you need to constrain
i believe i have to learn this. i have been using fusion 360 for about 5 years but never needed any constraints ever, not in the way that i have had to use the constraints tools anyway, i guess sketches constrains automaticly or something, or are they just not needed? :)
If you draw a center rectangle from the origin, and then define the dimensions of the two sides, then it would be fully constrained
It starts to matter more when you are using parametric dimensions and other user parameters that can change based on the values that you input. Then the constraints are needed to make sure that everything adjusts accordingly.
I too seldom worry if my sketch is fully constrained. But most of my projects are functional one of a kind so I haven't found very many problems. Well there is one. On a complex sketch, with some lines being offset lines, if I try to cut a part of the offset line or its source line the sketch will distort (lines go everywhere). The solution is to remove the offset constraint.
I tried to do the exact same with a 3D sketch but somehow it turns blue as soon as I add a line in the 3rd dimension. However, nothing moves and all lengths are defined Can someone explain to me how to fully dimension a 3D sketch?
You need to define the angles from the plane that the first sketch is in. You probably need to define the angles from three dimensions. It's basically a vector in space that needs to know the distance and the angle from multiple planes and then it should be fully defined
ive spent 3 days trying to figure out why my whole sketch wasn't defined turns out I just need a coincident constraint. 🤦🏼♂️
Sometimes it is the simplest things, glad you figured it out
I've been having a problem where my sketch is fully constrained - every single line is black, clicking interior highlights said interior, exterior does exterior. I've zoomed in and confirmed (despite the black lines indicating constrained) all lines are connected at each end to another. Reviewing your video, I've gone through the entire sketch to confirm all constraints are in place, and profile/lines are unmovable, as you indicate. It simply will not define.
If I select the interior of the object and hover over a line, ALL of the other black lines turn RED! The lines remain black unless I hover over sketch line/arc. Google indicates Red lines means there is an adjacent profile next to the particular line - which there is, and should be. But, the sketch which won't define is intended to cut/excise a portion of the adjacent profile body, so it's suppose to be adjacent :(
Been messing with this for 2 days now, even started from scratch several times - arg :( Is there anywhere in Fusion which will show what's preventing definition?
Often when you can't constrain a sketch in Fusion 360, there is a stray point somewhere. When drawing lines in Fusion it is easy to accidentally click an extra time and create a line that looks like a single line but is really two lines end to end.
Even if these lines are "locked" and can't move, Fusion doesn't consider the sketch constrained unless the distance to that point is defined.
Try looking for stray points
@@WhatMakeArt Thank you for the quick reply. II think I might have discovered where, but not why. I'm defining a dovetail joint tooth (I' d upload pic if I could). Everything is fine until I place the upper, angled, tooth line. I define that at a set angle, but the length is dependent on the depth of the tooth itself. But, I assume as the length is not fixed, F360 doesn't like it - even though if I did fix it, it would "break" the other depth and width constraints. It may not be possible to fully define this particular sketch :( Now, I just have to figure out why my definition won't define but the Tutorial I followed does. Frustrating, but that's actually part of the fun of learning.
F360 is an incredible application, made only better by those of you who are willing to spread your knowledge on how to best use it. Thank you!
@OopsWhatIMeantToDo that does sound like an interesting sketch situation, hope you figure it out and thanks for sharing with everyone what you tried so far
Is there a way to tell how many constraints I need to make it full constrained. This is a feature that I like in Siemens NX. It does the line thing, but tells you how many more constraints you need before you are fully constrained. This is really helpful for all of the really complex engine parts I have to design where you have lots of lines and dimensions in each sketch.
It doesn't give you a number but the unconstrained line are blue in Fusion 360 sketches
@@WhatMakeArt Ahh I was just hoping for a way to turn that feature on. Line colors will have to do. Thanks tho!