Hi morroklump, welcome to Fusion and nice first model. Dan’s receommendation is completely correct, based on the way you created this model. I’ll break down what you did.
the main volume of the box you created using a primitive.
this gives you a very fast way to build form and explore ideas, however, it’s not the best method if you want to control your design.
the method you went trough to create the speaker shape is really where you should start if you know you want to control your design.
steps worth trying
start with a sketch of the main shape, you can dimension this and add the main features in this sketch as well, speaker holes/location, ports. connector locations, etc.
best practice: keep your sketches as simple as possible, stay away from adding fillets or secondary level of detail that will need to be added to your model
Create the main extrusion
now you can go through and add the remaining features using new sketch + project (from your original sketch)
good luck and we’re happy to answer other questions to help get up and running
I’ve added this into the model you posted. have a look at what I started and you’ll be on your way, because you’ve got the generaly prinicples, just need to put them together a little differently
hope this helps,
Jamie Gilchrist
Principal Experience Designer
Fusion 360 Design, Validate & Document
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17531 Views, 16 Replies
08-28-2013
04:02 PM
Sketch Geometry Overconstrained
This has to be one of the most annoying features of F360. There doesn’t seem to be any logic behind it and the message doesn’t offer any indication of which constraints are causing the problem. Solidworks seems to offer a much more userfriendly solution when it comes to sketch constraints.
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16 REPLIES 16
08-28-2013
05:22 PM
I’ve received that error myself, so I know exactly where you are at. Are you positive there is no underlying sketch geometry, projected sketch geometry, or a misunderstood constraint that is causing this issue?
Is there any chance you could post a video or a sample file to this post? I would be happy to look at the video/file and see if I have any suggestions that may help.
Kind Regards,
Nathan Chandler
Principal Specialist
08-28-2013
08:22 PM
so it turns out that I had some of the sketch geometry fixed as well as being driven by constrains and dimensions.
It would be nice if the pop up messages offered explainations rather than just giving a warning. I shouldn’t need to come and post here everytime I can’t figure something out.
08-02-2014
11:31 PM
So I’m hitting this too.
«Are you positive there is no underlying sketch geometry, projected sketch geometry, or a misunderstood constraint that is causing this issue?»
Well, in my case, I’m positive that I did do something wrong — probably many things. How do I find out which one of them is causing the problem? Is that error message really just «something’s wrong, somewhere — good luck finding it!» Surely it must log something that would help to track down the problem.
—-
James Moore
james@restphone.com
08-03-2014
06:11 AM
@innovatenate wrote:
… a misunderstood constraint that is causing this issue?
Try changing the dimension in this sketch that controls the other dimensions (the largest construction circle diameter, I forget what diameter it is currently set to in this file, I think it should be d7).
Sometimes it works, sometimes it doesn’t.
If I make the change in small increments rather than large increments, it is less likely to return error (I can eventually make large change through small steps).
Geometric Constraints.zip
08-18-2014
06:40 PM
Looks like I had the same issue. What the problem was I was doing a center arc and it already put in the R-6 dimension on the bottom flat part. If I wanted to add the a sketch dimension for the left flat part for clarity of what the scaled size is, then I have to delete the first dimension number.
08-19-2014
01:36 PM
Same here. A clue as to what the program doesn’t like would be nice. I used Solidworks for about a year and I have to admit it was a lot more user friendly in that area.
08-16-2018
09:25 PM
I often have the same problem and I agree about the level of frustration (plus time wasted) in trying to figure out what’s causing the issue. I’ve been chasing one today for many hours and I’m pulling my hair out trying to figure out what’s causing it. ARRGH! I love Fusion 360 but this is painful!
John
PS. Here’s a screenshot of my current issue:
08-17-2018
07:36 AM
@bratwiz
If you dimension a rectangle BEFORE you put the Fix constraint on it, okay no problem. Actually, that dimension should turn into a driven one when you Fix the rectangle.
If you dimension a rectangle AFTER you put the Fix constraint on it, then of course it will be a driven constraint.
08-17-2018
03:26 PM
Hi, thanks for the reply!
Where have I used a Fixed constraint? If you spot one, please let me know! I would really like to figure out what I’m doing wrong.
When I said I set the value, I set the value equal to the global parameter «Height» when I created the rectangle. As you can see in the picture, the «Width» dimension, as shown across the bottom is still tied to that parameter (fx:whatever) but the one on the right has somehow become fixed / driven as evidenced by the (30.00). Incidently, ‘30.00’ was the original value of the «Height» parameter.
John
08-17-2018
08:21 PM
I can tell the Fix constraint has been applied to the rectangle because it is green.
08-17-2018
08:28 PM
Okay, apologies for my being dense… why is one leg (the width) NOT constrained (fixed) and the height is? I’m willing to agree that you are correct but I don’t understand how the rectangle could be «fixed» but only one side is fixed and not the other? And more to the point, if the rectangle has been «fixed», how do I unfix it?
08-17-2018
08:37 PM
Probably you drew the rectangle and dimensioned both sides when you created it, or soon afterwards at least.
Later, you Fixed it.
And later still, you deleted that dimension and recreated it.
You can UN-fix something by selecting it, and then toggling the Fix/Unfix constraint on the sketch options palette.
08-17-2018
08:44 PM
THANK YOU !!!!! 
I figured it out just after your last email, but you are 100% correct. That did it. I never noticed anything turning green before, but that was definitely the problem.
MANY THANKS!!!
John
08-27-2018
02:24 PM
New to all of this, but doing well with lotz of practice.
Know this is an old thread but was having same issue, found also if you took what 360 was thinking you wanted for a dimension and just hit enter, the error would appear, if you instead entered the figure all was well?
@rpagewood wrote:
This has to be one of the most annoying features of F360. There doesn’t seem to be any logic behind it and the message doesn’t offer any indication of which constraints are causing the problem. Solidworks seems to offer a much more userfriendly solution when it comes to sketch constraints.
08-16-2019
08:30 AM
my solution ended up being as simple as deleting the construction line and remake it. Then it worked!
edit: didn’t realise how old this post was. Problem still happens sometimes and honestly the popup message in 360 is still the same and of no help!
06-02-2020
11:44 PM
I have had a few of these , and being a total beginner need all the help there is . When that is all the info you get it don’t help a lot 
-
Back to forum -
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Next
Hi morroklump, welcome to Fusion and nice first model. Dan’s receommendation is completely correct, based on the way you created this model. I’ll break down what you did.
the main volume of the box you created using a primitive.
this gives you a very fast way to build form and explore ideas, however, it’s not the best method if you want to control your design.
the method you went trough to create the speaker shape is really where you should start if you know you want to control your design.
steps worth trying
start with a sketch of the main shape, you can dimension this and add the main features in this sketch as well, speaker holes/location, ports. connector locations, etc.
best practice: keep your sketches as simple as possible, stay away from adding fillets or secondary level of detail that will need to be added to your model
Create the main extrusion
now you can go through and add the remaining features using new sketch + project (from your original sketch)
good luck and we’re happy to answer other questions to help get up and running
I’ve added this into the model you posted. have a look at what I started and you’ll be on your way, because you’ve got the generaly prinicples, just need to put them together a little differently
hope this helps,
Jamie Gilchrist
Principal Experience Designer
Fusion 360 Design, Validate & Document
Stuck on a workflow? Have a tricky question about a Fusion 360 feature? Share your project, tips and tricks, ask questions, and get advice from the community.
Turn on suggestions
Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.
Showing results for
Search instead for
Did you mean:
-
Back to forum -
Previous -
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17494 Views, 16 Replies
08-28-2013
04:02 PM
Sketch Geometry Overconstrained
This has to be one of the most annoying features of F360. There doesn’t seem to be any logic behind it and the message doesn’t offer any indication of which constraints are causing the problem. Solidworks seems to offer a much more userfriendly solution when it comes to sketch constraints.
-
Back to forum -
Previous -
Next
16 REPLIES 16
08-28-2013
05:22 PM
I’ve received that error myself, so I know exactly where you are at. Are you positive there is no underlying sketch geometry, projected sketch geometry, or a misunderstood constraint that is causing this issue?
Is there any chance you could post a video or a sample file to this post? I would be happy to look at the video/file and see if I have any suggestions that may help.
Kind Regards,
Nathan Chandler
Principal Specialist
08-28-2013
08:22 PM
so it turns out that I had some of the sketch geometry fixed as well as being driven by constrains and dimensions.
It would be nice if the pop up messages offered explainations rather than just giving a warning. I shouldn’t need to come and post here everytime I can’t figure something out.
08-02-2014
11:31 PM
So I’m hitting this too.
«Are you positive there is no underlying sketch geometry, projected sketch geometry, or a misunderstood constraint that is causing this issue?»
Well, in my case, I’m positive that I did do something wrong — probably many things. How do I find out which one of them is causing the problem? Is that error message really just «something’s wrong, somewhere — good luck finding it!» Surely it must log something that would help to track down the problem.
—-
James Moore
james@restphone.com
08-03-2014
06:11 AM
@innovatenate wrote:
… a misunderstood constraint that is causing this issue?
Try changing the dimension in this sketch that controls the other dimensions (the largest construction circle diameter, I forget what diameter it is currently set to in this file, I think it should be d7).
Sometimes it works, sometimes it doesn’t.
If I make the change in small increments rather than large increments, it is less likely to return error (I can eventually make large change through small steps).
Geometric Constraints.zip
08-18-2014
06:40 PM
Looks like I had the same issue. What the problem was I was doing a center arc and it already put in the R-6 dimension on the bottom flat part. If I wanted to add the a sketch dimension for the left flat part for clarity of what the scaled size is, then I have to delete the first dimension number.
08-19-2014
01:36 PM
Same here. A clue as to what the program doesn’t like would be nice. I used Solidworks for about a year and I have to admit it was a lot more user friendly in that area.
08-16-2018
09:25 PM
I often have the same problem and I agree about the level of frustration (plus time wasted) in trying to figure out what’s causing the issue. I’ve been chasing one today for many hours and I’m pulling my hair out trying to figure out what’s causing it. ARRGH! I love Fusion 360 but this is painful!
John
PS. Here’s a screenshot of my current issue:
08-17-2018
07:36 AM
@bratwiz
If you dimension a rectangle BEFORE you put the Fix constraint on it, okay no problem. Actually, that dimension should turn into a driven one when you Fix the rectangle.
If you dimension a rectangle AFTER you put the Fix constraint on it, then of course it will be a driven constraint.
08-17-2018
03:26 PM
Hi, thanks for the reply!
Where have I used a Fixed constraint? If you spot one, please let me know! I would really like to figure out what I’m doing wrong.
When I said I set the value, I set the value equal to the global parameter «Height» when I created the rectangle. As you can see in the picture, the «Width» dimension, as shown across the bottom is still tied to that parameter (fx:whatever) but the one on the right has somehow become fixed / driven as evidenced by the (30.00). Incidently, ‘30.00’ was the original value of the «Height» parameter.
John
08-17-2018
08:21 PM
I can tell the Fix constraint has been applied to the rectangle because it is green.
08-17-2018
08:28 PM
Okay, apologies for my being dense… why is one leg (the width) NOT constrained (fixed) and the height is? I’m willing to agree that you are correct but I don’t understand how the rectangle could be «fixed» but only one side is fixed and not the other? And more to the point, if the rectangle has been «fixed», how do I unfix it?
08-17-2018
08:37 PM
Probably you drew the rectangle and dimensioned both sides when you created it, or soon afterwards at least.
Later, you Fixed it.
And later still, you deleted that dimension and recreated it.
You can UN-fix something by selecting it, and then toggling the Fix/Unfix constraint on the sketch options palette.
08-17-2018
08:44 PM
THANK YOU !!!!! 
I figured it out just after your last email, but you are 100% correct. That did it. I never noticed anything turning green before, but that was definitely the problem.
MANY THANKS!!!
John
08-27-2018
02:24 PM
New to all of this, but doing well with lotz of practice.
Know this is an old thread but was having same issue, found also if you took what 360 was thinking you wanted for a dimension and just hit enter, the error would appear, if you instead entered the figure all was well?
@rpagewood wrote:
This has to be one of the most annoying features of F360. There doesn’t seem to be any logic behind it and the message doesn’t offer any indication of which constraints are causing the problem. Solidworks seems to offer a much more userfriendly solution when it comes to sketch constraints.
08-16-2019
08:30 AM
my solution ended up being as simple as deleting the construction line and remake it. Then it worked!
edit: didn’t realise how old this post was. Problem still happens sometimes and honestly the popup message in 360 is still the same and of no help!
06-02-2020
11:44 PM
I have had a few of these , and being a total beginner need all the help there is . When that is all the info you get it don’t help a lot 
-
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Previous -
Next
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Welcome to SE.3DP!
First off, F360 isn’t the best with STL files. If you’re having trouble with constraints and dimensions, I would suggest watching this Maker’s Muse video first: How to use Constraints! CAD for Newbies with Fusion 360.
Second, Fusion360 is very tricky with importing STL’s. My steps below should help.
-
In the lower right-hand corner, at the rightmost end of the timeline, you’ll see a little gear. When you click on the gear, click the very top option: «Do not capture design history». This puts you into Direct Modelling mode.
-
In the top left-hand corner, where it says «Model», and select «Mesh» from the menu.
-
Along the toolbar, in the «Create» section, click «Insert mesh». When that’s done, go back to the top left where it now says «Mesh» and use the menu to go back to «Model».
-
Now that you’re back in «Model», go to the «Modify» menu. In there, find the «Mesh» section, and in that box, click «Mesh to BRep». That will convert your STL into a Fusion360 file that you can edit.
Now, if you want to use constraints, I would suggest sketching out your object entirely in Fusion, making constraints and dimensions along the way. I know it’s annoying, but it’ll be easier to modify it in Fusion.
Hope that helps!
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Please assume that all posts are [serious] by default, and try to respond with serious comments if at all possible. Some funny feedback is welcome, but it shouldn’t overwhelm the serious comments on the thread. The expectation is that people come here to learn new techniques or solve a problem, frequently for their job.
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(New to Fusion 360) I’m getting the error: «Sketch geometry is over constrained» when I try and use the Horizontal/Vertical constraint on the highlighted line; does anyone know why this is happening?
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Welcome to SE.3DP!
First off, F360 isn’t the best with STL files. If you’re having trouble with constraints and dimensions, I would suggest watching this Maker’s Muse video first: How to use Constraints! CAD for Newbies with Fusion 360.
Second, Fusion360 is very tricky with importing STL’s. My steps below should help.
-
In the lower right-hand corner, at the rightmost end of the timeline, you’ll see a little gear. When you click on the gear, click the very top option: «Do not capture design history». This puts you into Direct Modelling mode.
-
In the top left-hand corner, where it says «Model», and select «Mesh» from the menu.
-
Along the toolbar, in the «Create» section, click «Insert mesh». When that’s done, go back to the top left where it now says «Mesh» and use the menu to go back to «Model».
-
Now that you’re back in «Model», go to the «Modify» menu. In there, find the «Mesh» section, and in that box, click «Mesh to BRep». That will convert your STL into a Fusion360 file that you can edit.
Now, if you want to use constraints, I would suggest sketching out your object entirely in Fusion, making constraints and dimensions along the way. I know it’s annoying, but it’ll be easier to modify it in Fusion.
Hope that helps!