Sketch fillet rotating other parts of sketch

[Anonymous]

Hi, i am a competent user of autocad, but trying to learn fusion360.

In a sketch i am filleting the corners, all the external corners are fine, but when filleting the corner of a rectangle inside the outer rectangle the fillet command is rotating other components of the drawing

The preview of the 5mm radius corner shows correct until i press enter, the attached screenshots shows the problem

Thanks

[HughesTooling]

Best practice with solid modeling is to add your fillets to the solid model as late in the design as possible. That said it shouldn't really start rotating your sketch so can you export the design as a f3d and attach. The problem is probably to do with when the fillet's added the lines are trimmed and the sketcher is trying to apply the constraints after the trim and moving parts you don't want moved. The advice is usually to tie everything down with dimensions and constraints to minimise problems like you're seeing but filleting will quite often remove constrains when the line is trimmed.

Mark

PS One more thing to consider is Fusion's sketcher is still in development so it a good idea to keep the sketch simple without fillets as you'll get better performance.

[Anonymous]

Hopefully the f3d file has attached.

I understand your point on modelling fillets later, but cant understand whats causing this problem. Not experienced this filleting problem in autocad before. 

Like i said, fusion360 is all very new to me so its all a learning curve

[JDMather]

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@Anonymous wrote:

....Not experienced this filleting problem in autocad before. 

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AutoCAD Geometry Constraints.png

Did you use geometry Constraints in your AutoCAD experience?

(modified file attached)

[Anonymous]

didnt use them in autocad.

I removed the contraints in my sketch and the filleting worked, but for some reason didnt trim all the corners.

Why would the constraints cause such a shift in the sketch from filleting? 

[JDMather]

Compared to the other CAD softwares that I use - the Fusion sketcher still has a few "issues".

Just have to work with them for now.

But as noted - in any parametric software it is better to use placed features rather than sketched features when possible.

If you find yourself creating duplicate geometry in a sketch - then there is probably a better way.  (Placed Features and Patterned Features.)

[TrippyLighting]

Forget AutoCAD. Sketching in Fusion 360 works with a completely different sketch solver and you'll have to adapt to that.

 The screencast has a couple of hints for filleting in conjunction with dimensioning a rectangle.

In general, happy fillets sa features to a solid model. Also, do filleting as late in the design process as possible.

[TrippyLighting]

Don NOT remove the constraints. That will throw your designs for a loop in Fusion 360.

Constraints applied sensibly are your friends not foes!

[HughesTooling]

Something that's adding to the confusion in your sketch is you have doubled up some geometry.

tool2.png

Mark

[jeff_strater]

Hi @Anonymous,

I was unable to duplicate the problem you showed.  Is this screencast reflect the fillet you were trying to apply?:

If you can show me the workflow that produces the bad results, I'll have the sketch team take a look at it.

Also, to reiterate what @HughesTooling said - you seem to have a duplicate rectangle on the right side of your sketch.  I can guess how this happened.  Did you at any time select that rectangle and copy/paste it?  Then Cancel the operation?  For reasons that are too detailed to go into here, Paste in sketch is a two-step operation, so the Cancel only cancels the Move, not the copy.  It's a bug, and we'll fix it at some point.  But anyway, the point is:  you should delete the extra rectangle before you do anything else.

Jeff

[Anonymous]

Yes it was the top right of that rectangle plus some of the corners on the other smaller rectangles.

As this is my first time playing with fusion its likely that i was just doing something wrong. Ive redone the sketch and model now with no problems so not sure how to replicate the error. 

[HughesTooling]

@jeff_strater You got lucky and selected one of the duplicates that works. If you select and delete the duplicates, take the top one on the selection list and delete, then try again I think you'll see the problem. There are some odd thing that go on when you remove the duplicates, I'll do  a screencast later and upload the file because I think it's a good example for tuning up the sketch engine.

Mark

[HughesTooling]

OK it gets even stranger. I thought I'd reopen the file and start with the original, first test after deleting all the double curve I could add all the fillets without a problem. Tried again and recorded what I did and the file this time gave me problems with the fillet. I saved the file in that state but when I reopen it works fine so no good for demonstrating the problem.

Anyway here's the screencast to show it does have problems sometimes.

Mark