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Hi,
I'm pretty new to Fusion 360 but not to CAD in general. I've been a fairly long time AutoCAD user, though not deeply, so there may be some issue there about how I'm used to thinking about models versus how Fusion 360 works. I'm really trying to understand how the constraints system works but I'm obviously still missing something. Case in point, I've got some geometry that I'm trying to pattern around the rim of a wheel that I cannot seem to get to go blue. I tried to copy it instead (thinking there was something I was missing regarding how patterns work) and still got unconstrained geometry. So I super simplified the operation I was trying to do, made the following test case, and got the same results.
1. Draw two construction line circles from the origin, one 3 units in diameter and one 5 units in diameter.
2. Draw Construction Line 1 from Origin as vertical line 4 units.
3. Draw Construction Line 2 from Origin at random angle 4 units long and then constrain angle with dimension to 7.5 degrees CW.
4. Draw Construction Line 3 from Origin at random angle 4 units long and then constrain angle to 15 degrees CW from Line 2.
5. Draw Construction Line 4 from Origin along Line 2 to intersection with 3 unit circle.
6. Draw Construction Line 5 from Origin along Line 3 to intersection with 3 unit circle.
7. Draw Circle 3 with diameter of 0.125 units, centered on Line 4 end point. (Circle is black, all is well...)
8. Use Move/Copy to copy Circle 3 to the end point of Line 5.
At this point, everything else is black, the new circle is blue, and it seems no amount of constraining will make it turn black. In fact, most of the constraints I try to add give me either a "Failure to Solve" or "Over Constrained" errors. I know it's probably something really simple and obvious (most of my mistakes with Fusion 360 have been thus far), but I really can't seem to figure out what I'm doing wrong... And what prompted this was I was trying to make a circular pattern of these circles and even though the original circle was black, none of the ones produced from the pattern were and I couldn't seem to figure out how to make them go black.
Now I did just figure out that one issue I had was that Line 5 was unconstrained. I don't quite understand why, though I think maybe I do? Either way, the dot at the end of Construction Line 5 is now black, as is the line. But the circle is still blue. I even tried deleting and recopying the circle thinking that maybe that instance was still referencing old geometry, but no joy.
What am I doing wrong and/or what am I missing???
The same condition exist in both of files. You are missing a Coincident constraint from the center of the circle to a point. When in doubt, simply drag the sketch entity to determine the missing constraint.
John Hackney, Retired
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John Hackney, Retired
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I did a little video on patterning sketch entities and constraints. In the video I emphasis, you do not want to pattern in the Sketch, move to the Model and pattern bodies or features, it is much more efficient.
John Hackney, Retired
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