2D Contour circle Calculating Incorrectly

[Ivan_Nuno]

Hey so this is a fun and new issue I'm seeing today.

Drawing circles, CAM sends out half circles.

Some NC code to go with:

N10 (Program name: )
N11 (Program comment: )
(T5 D=0.25 CR=0. - ZMIN=-0.006 - FLAT END MILL)
N12 G00 G17 G40 G90
N13 G70
N14 D0
N15 G53
N16 G00 Z0.

(2D CONTOUR1)
N17 G53
N18 T5 M06
N19 D5
N20 G54
N21 M03 S18000
N22 G04 5
N24 G00 X2.9981 Y4.1686
N25 G00 Z1.1
N26 G00 Z0.7894
N27 G01 Z0.25 F72.
N28 G01 X2.5 Y4.125 F144.
N29 G03 X0.875 Y2.5 J-1.625
N30 G03 X2.5 Y0.875 I1.625
N31 G01 X2.0019 Y4.1686
N32 G00 Z0.7
N33 G00 X2.9981
N34 G01 Z0.024 F72.
N35 G01 X2.5 Y4.125 F144.
N36 G03 X0.875 Y2.5 J-1.625
N37 G03 X2.5 Y0.875 I1.625
N38 G01 X2.0019 Y4.1686
N39 G00 Z0.7
N40 G00 X2.9981
N41 G01 Z-0.006 F72.
N42 G01 X2.5 Y4.125 F144.
N43 G03 X0.875 Y2.5 J-1.625
N44 G03 X2.5 Y0.875 I1.625
N45 G01 X2.0019 Y4.1686
N46 G00 Z1.1

N48 D0
N49 G00 Z0.
N50 G53
N51 M08
N52 G00 X10. M05
N53 G00 Y120.
N54 M30

[Ivan_Nuno]

Here's the file - so you can see my defaults in the 2D contour operation.

I've figured out I can do a few things to make it work (add finishing pass, multiple depths etc), and after reversing those things, it seems to calculate correctly. But when selecting it and creating the path for the first time, it creates that problem.

[HughesTooling]

A couple of things, one your tolerance is 0.05" which is way too big, try 0.0005 and smoothing is not needed if you are working with a true arc. I found you need to set the smoothing to 0.0005" as well then uncheck smoothing or you'll get an error.

See attached file,

Mark

[Ivan_Nuno]

Hey Mark, thanks for looking into this.

Without getting to into why our tolerance is set so high -I can open your file and change the tolerance back to 0.05 (with smoothing off) and it calculates just fine.

Seems like having smoothing on at all causes this to happen. I'm not sure if it is the only thing that causes it...

[Ivan_Nuno]

I also noticed when turning on / off smoothing, Fusion doesn't regenerate the toolpath.

[paul.clauss]

Hi @Ivan_Nuno

Thanks for bringing this to my attention! I was able to recreate in both your file and a new design and have logged CAM-12481 with the development team to look into a future fix.

For the time being, I was able to get the toolpath working by either omitting smoothing or using the default values for multiple depths. You could also create a similar Bore toolpath on this geometry.

I hope this helps! I appreciate you reaching out about this - please let me know if you have any questions.

[seth.madore]

An update was pushed out today that will address the Smoothing issues. Sorry for the inconvenience and thank you for your patience!