CAD posting multiple short lines instead of G2/G3

[Forger79]

I am using fusion 360 and when boring a hole fusion outputs a large number of very short straight lines instead of a G2 or G3.
Is there any way to get fusion to use G2's or G3's?

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[cwtoyota]

I am using fusion 360 and when boring a hole fusion outputs a large number of very short straight lines instead of a G2 or G3.
Is there any way to get fusion to use G2's or G3's?

I don't think there's a way to do exactly what you want, but I'm not a Fusion 360 expert.
When I've asked before, I've been told I need to adjust the "smoothing" settings, etc. That doesn't make a G2 or G3 for a circular path, it turns small clumps of G1s into G2 or G3 where they fit.

In my case, the older Fanuc system I'm running cannot buffer enough blocks of G-Code for smooth operation at a reasonable cutting feed rate.
These older machines just can't handle the volume and rate of data coming from modern CAM software.

I program using some scripts I wrote that create G-Code from polyline curves in CAD. If I ever get that to a state worthy of sharing, I'll do so.

[The Engine Guy]

I am using fusion 360 and when boring a hole fusion outputs a large number of very short straight lines instead of a G2 or G3.
Is there any way to get fusion to use G2's or G3's?

What Post Processor are you using, some PP don`t support Helical Arcs which from your post is what you are looking for, yes??

If so have a look at the attached image and the attached .nc file, all the movements are R type arcs, if your machine control will only accept I,J,K movements then that can be done as well.



I used the Generic Fanuc Post to generate the .nc code in the Zip file.

Here is a snippet of the code:-

(BORE3)
N30 T1 M06
N35 S5000 M03
N40 G54
N45 M08
N50 G00 X2.5 Y-1.
N55 G43 Z15. H01
N60 G00 Z2.
N65 G01 Z1. F1000.
N70 G18 G02 X3.5 Z0. R1.
N75 G01 X4.
N80 G17 G03 X5. Y0. R1.
N85 X0. Y5. Z-0.25 R5.
N90 X-5. Y0. Z-0.5 R5.
N95 X0. Y-5. Z-0.75 R5.
N100 X5. Y0. Z-1. R5.
N105 X0. Y5. Z-1.25 R5.
N110 X-5. Y0. Z-1.5 R5.
N115 X0. Y-5. Z-1.75 R5.
N120 X5. Y0. Z-2. R5.
N125 X0. Y5. Z-2.25 R5.
N130 X-5. Y0. Z-2.5 R5.
N135 X0. Y-5. Z-2.75 R5.

Hope it helps some

Regards
Rob

[precisionmetal]

Here is a .750" diameter hole in a 1" thick piece of material. 2d boring strategy, using .04" pitch on boring, single pass.

Posted for a Haas using the latest "pre-NGC" post.

-------------------------
%
O09001 (bore_test)
(Using high feed G1 F500. instead of G0.)
(T1 D=0.5 CR=0. - ZMIN=-1.01 - flat end mill)
N10 G90 G94 G17
N15 G20
N20 G53 G0 Z0.

(Bore1)
N30 T1 M6
N35 S8000 M3
N40 G54
N45 M8
N55 G0 X0. Y-0.05
N60 G43 Z0.6 H1
N65 G0 Z0.08
N70 G1 Z0.05 F50.
N75 G18 G2 X0.05 Z0. I0.05 K0.
N80 G1 X0.075
N85 G17 G3 X0.125 Y0. I0. J0.05
N90 X0.1245 Y-0.0109 Z-0.0394 I-0.125 J0.
N95 X0.1231 Y-0.0217 Z-0.0789 I-0.1245 J0.0109
N100 X0.1207 Y-0.0324 Z-0.1183 I-0.1231 J0.0217
N105 X0.1175 Y-0.0428 Z-0.1578 I-0.1207 J0.0324
N110 X0.1133 Y-0.0528 Z-0.1972 I-0.1175 J0.0428
N115 X0.1083 Y-0.0625 Z-0.2367 I-0.1133 J0.0528
N120 X0.1024 Y-0.0717 Z-0.2761 I-0.1083 J0.0625
N125 X0.0958 Y-0.0803 Z-0.3156 I-0.1024 J0.0717
N130 X0.0884 Y-0.0884 Z-0.355 I-0.0958 J0.0803
N135 X0.0803 Y-0.0958 Z-0.3944 I-0.0884 J0.0884
N140 X0.0717 Y-0.1024 Z-0.4339 I-0.0803 J0.0958
N145 X0.0625 Y-0.1083 Z-0.4733 I-0.0717 J0.1024
N150 X0.0528 Y-0.1133 Z-0.5128 I-0.0625 J0.1083
N155 X0.0428 Y-0.1175 Z-0.5522 I-0.0528 J0.1133
N160 X0.0324 Y-0.1207 Z-0.5917 I-0.0428 J0.1175
N165 X0.0217 Y-0.1231 Z-0.6311 I-0.0324 J0.1207
N170 X0.0109 Y-0.1245 Z-0.6706 I-0.0217 J0.1231
N175 X0. Y-0.125 Z-0.71 I-0.0109 J0.1245
N180 X-0.0109 Y-0.1245 Z-0.7494 I0. J0.125
N185 X-0.0217 Y-0.1231 Z-0.7889 I0.0109 J0.1245
N190 X-0.0324 Y-0.1207 Z-0.8283 I0.0217 J0.1231
N195 X-0.0428 Y-0.1175 Z-0.8678 I0.0324 J0.1207
N200 X-0.0528 Y-0.1133 Z-0.9072 I0.0428 J0.1175
N205 X-0.0625 Y-0.1083 Z-0.9467 I0.0528 J0.1133
N210 X-0.0717 Y-0.1024 Z-0.9861 I0.0625 J0.1083
N215 X0. Y0.125 Z-1.01 I0.0717 J0.1024
N220 Y-0.125 I0. J-0.125
N225 Y0.125 I0. J0.125
N230 X-0.05 Y0.075 I0. J-0.05
N235 G1 Y0.05
N240 G19 G2 Y0. Z-0.96 J0. K0.05
N245 G0 Z0.6

N250 M5
N255 M9
N260 G53 G0 Z0.
N270 X0.
N275 G53 Y0.
N280 M30

%
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PM