Chamfer does not produce identical results on identical edges

[mfla58743]

I'm trying to do a chamfer on two identical opposite edges on this model:

I do the same chamfer on both on the same time and this is the result I get:

 
Why could this be happening? The ones above turned out perfectly identical.

Normally I would think something like this could happen if the edges were offset slightly, but I have extruded (and cut) from a sketch that is perfectly perpendicular on the Y axis, so this cannot be true.

Any help on correcting this, so that both sides are identical would be greatly appreciated. I'm new to Fusion, so it may be something simple 🙂

 

[jhackney1972]

Please attach your model.  Open in Fusion, select the File menu, then Export and save to your hard drive.  Attach this file to a reply post.

[mfla58743]

This is unfortunately not a model I am allowed to upload.

I was hoping that the images was enough 🙂

The way the faces are created on the right side make it look like the model is somehow slightly lopsided, but that doesn't make any sense to me as this is made up of extrusions at 90 degree angles. 

I have tried redoing the entire model from scratch two times now, redoing the sketches in the process.

The top chamfers look perfectly identical. The others look perfectly symmetrical too, until I chamfer them.

[johnsonshiue]

Hi! Based on the image, the chamfer does look asymmetric. It could be a bug or the original cut edges are not symmetric to begin with. Check the sketch creating the cut feature and make sure the geometry is perfectly symmetric.

Many thanks!

[mfla58743]

I will try again tomorrow. I don't understand how the sketch could possibly have influence when I just extrude it. It should be perfectly symmetrical.

[TheCADWhisperer]

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@mfla58743 wrote:

It should be perfectly symmetrical.

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@mfla58743 

Should be? Or is.

Are your sketches fully defined? Any blue lines or white dots?

Have you used Splines in the sketch?

Are there any unresolved issues highlighted in yellow or red on the Timeline?

Does Ctrl b (CMD b on Mac) return any warnings?

Can you at least post screen capture image of the "symmetrical" sketch?

[mfla58743]

Sketch seem fully defined. This is a dxf I have imported from Illustrator though. I have tried so many times now to do it all over and I consistently get this result.

It doesn't make sense at all regardless if there was some error with my sketch. The extrusion should be identical all across the axis, and again the top chamfer is perfect.

I can only assume this is a bug in Fusion. Not sure how I can possibly correct this and move forward with my design 😕

[mfla58743]

A distance of 1.8mm rather than 2 does produce a correct result. So I guess I'll just have to go with that.

[TheCADWhisperer]

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@mfla58743 wrote:

This is a dxf I have imported from Illustrator though.

Not sure how I can possibly correct this and move forward with my design 😕

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@mfla58743 

Model native geometry.

[mfla58743 · Accepted solution]

So, I literally went for a walk to collect a package, got back home and now this no longer works anymore. Now it gives broken results at any distances. I should have saved when it suddenly worked partially 😞

This is not very constructive I realise, but Fusion takes the cake as the most broken piece of software I have used in my life. At the very least it does not crash all the time currently, but it did last week. I have completely given up on using the rotating cube as it just stops working every now and then. And I can only assume that this is yet another bug that I can't really do anything about. 

[laughingcreek]

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@mfla58743 wrote:

So, I literally went for a walk to collect a package, got back home and now this no longer works anymore....

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most likely it wasn't going to work before the walk either, but fusion didn't catch it till a "compute all" was triggered.

working from  a DXF can be dicey.  There are all sorts of problems associated with things in DFX's that can cause problems.