topic Re: Trying to machine an ellipse and seeing step moves in part in Fusion Manufacture Forum

Trying to machine an ellipse and seeing step moves in part

hkenuam — Sun, 19 Feb 2023 14:06:10 GMT

I have a simple part that has an inner hole and ellipse shaped outer. When I machine the part I'm seeing each x/y move in part (see picture). I've tried smoothing, using R vs IJ and it some cases seems a bit better but still not acceptable.

If you look at the picture you can see the small moves (keep in mind I've gone over it a few times and you can see tool marks). But the individual steps I can't understand. I even thought maybe it's the machine but notice the hole in the center. Absolutely perfect.

Please help

Re: Trying to machine an ellipse and seeing step moves in part

seth.madore — Sun, 19 Feb 2023 14:15:17 GMT

Could you share your file here? It's not clear from the clipped image of your browser what toolpath may have left that mark.

File > Export > Save to local folder, return to thread and attach the .f3d file in your reply

Re: Trying to machine an ellipse and seeing step moves in part

hkenuam — Sun, 19 Feb 2023 14:49:48 GMT

I think I see the problem. I exported my ellipse as a .dxf and opened it in BobCad and what you see here is what the machine is doing. The outer ellipse I added using BobCad.

Re: Trying to machine an ellipse and seeing step moves in part

seth.madore — Sun, 19 Feb 2023 14:51:35 GMT

BobCad....watch your language 😉

Seeing the (Fusion) file would help us to determine if an old bug has popped up again, please share it if you can

Re: Trying to machine an ellipse and seeing step moves in part

hkenuam — Sun, 19 Feb 2023 16:08:48 GMT

Believe me, I left Bobcad a long long time ago. Fusion has been awesome.

Here is the file- btw, I could not include the file as an attachment.

%
O1001
(T19 D=0.75 CR=0. - ZMIN=-0.4 - flat end mill)
G90 G17
G20
M59
G0 M140
(2D Contour15)
T19 M6
S2500 M3
G54
M8
G0 X5.1171 Y-1.3196 Z0.6
G43 H19
Z0.2
G1 Z-0.325 F100.
G3.4 X5.1015 Y-1.304 Z-0.378
X5.064 Y-1.2665 Z-0.4 F40.
G1 G41 X5.0145 Y-1.217 D19
G3 X4.975 Y-1.3125 I0.0955 J-0.0955
G2 X4.9749 Y-1.3199 I-0.375 J0.
G1 X4.9744 Y-1.3477
G2 X4.9737 Y-1.3634 I-0.3749 J0.0074
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G1 X4.9678 Y-1.435
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Re: Trying to machine an ellipse and seeing step moves in part

seth.madore — Sun, 19 Feb 2023 17:00:42 GMT

Oh, not the NC code, but the actual Fusion file.

File > Export > Save to local folder, return to thread and attach the .f3d/f3z file in your reply.

What post processor are you using?

Re: Trying to machine an ellipse and seeing step moves in part

hkenuam — Sun, 19 Feb 2023 19:12:15 GMT

Here ya go.

Thanks in advance

Re: Trying to machine an ellipse and seeing step moves in part

seth.madore — Sun, 19 Feb 2023 19:17:13 GMT

Change your Tolerance on the 2D Contour toolpath, from .001" to .0001". Leave your Smoothing at .001".

These black dots represent toolpath points, Before and After:

Re: Trying to machine an ellipse and seeing step moves in part

seth.madore — Sun, 19 Feb 2023 19:18:44 GMT

Bulk of the resulting G-code:

N150 X5.064 Y-1.2665 Z-0.4 N155 G41 X5.0145 Y-1.217 D19 N160 G3 X4.975 Y-1.3125 I0.0955 J-0.0955 N165 G1 Y-1.3168 N170 G2 X4.7928 Y-1.9163 I-1.117 J0.0119 N175 X4.4418 Y-2.3025 I-1.2735 J0.8048 N180 X3.899 Y-2.6259 I-1.431 J1.7847 N185 X3.1067 Y-2.8642 I-1.3752 J3.1364 N190 X1.1982 Y-2.8001 I-0.808 J4.3902 N195 X0.4924 Y-2.5258 I0.8542 J3.2426 N200 X0.0201 Y-2.1818 I1.0561 J1.9464 N205 X-0.2857 Y-1.7439 I1.0182 J1.0368 N210 X-0.353 Y-1.0949 I1.0077 J0.4325 N215 X-0.0786 Y-0.5526 I1.2062 J-0.2698 N220 X0.3309 Y-0.1976 I1.3305 J-1.1213 N225 X0.9177 Y0.0868 I1.4316 J-2.2056 N230 X1.9034 Y0.2944 I1.2836 J-3.6525 N235 X3.4307 Y0.1673 I0.4026 J-4.4031 N240 X4.132 Y-0.1127 I-0.8647 J-3.1841 N245 X4.5817 Y-0.445 I-1.0703 J-1.9188 N250 X4.8855 Y-0.8808 I-1.017 J-1.0329 N255 X4.9755 Y-1.3125 I-1.045 J-0.443 N260 G1 X4.9757 Y-1.3213 F200.

Re: Trying to machine an ellipse and seeing step moves in part

hkenuam — Sun, 19 Feb 2023 22:54:15 GMT

Well, the most certainly made it much better. The rest might be feeds and speeds related. Thanks so much for the help. Fusion360 rocks!