MACH3 Turning Postprocessor Output wrong diameter

[tes.guangzhou]

Hello

I really learned to love Fusion360 but now i have absolutly no idea whats going wrong.

I use 360 for all steps, learned of youtube-videos how to face and profile a turning-part.

My Mach3-version is the newest one, Post downloaded at Autodesk.

My Problem:

I drawed a very simple cylinder with a filet on. Diameter 20mm, lengh ~63mm.

When i export this to Mach3 then the outside-way is on X20mm instead of 10mm like the radius should be.

At bigger filets the outputway drives crazy and the machined-ways are always the size of the diameter instead of the radius.

Someone an idea?

Thx in advance.

[HughesTooling]

In mach3 settings set to diameter mode, it's a lot easier to work with the control if it's set to diameter. You might need to reverse the arc direction as well.

Mark

[tes.guangzhou]

Hi Mark

Thank you for your suggest, i still found this too and played with, it makes no difference.

What i figured out is that the output of fusion360 is still wrong. 

I get X on 20mm instead of 10mm as it should be. It makes no matter what i try to change.

Here is the simple G-Code: (i only marked a few positions, all of them are outside my real diameter of 20mm)

%
(1001)
(V1.3)
N10 G90 G94 G18
N11 G21
N12 G91 G28 X0.
N13 G90

(FACE1)
N14 T0101
N15 G54
N16 M8
N17 G94
N18 G97 S500 M3
N19 G0 X41. Z5.
N20 G0 Z1.414
N21 G1 X23.828 F1000.
N22 X21. Z0.
N23 X-1.6
N24 X1.228 Z1.414
N25 G0 X41.
N26 Z5.

(PROFILE2)
N27 G94
N28 G97 S500 M3
N29 G0 X41. Z5.
N30 Z1.404
N31 X22.821
N32 G1 X21.828 F1000.
N33 X19. Z-0.01
N34 Z-1.54
N35 G18 G3 X20.98 Z-3.216 R6.8
N36 G1 X23.808 Z-1.802
N37 G0 Z1.404
N38 X20.078
N39 G1 X17.25 Z-0.01 F1000.
N40 Z-0.637
N41 G3 X20. Z-2.25 R6.8
N42 G1 X22.828 Z-0.836
N43 G0 Z1.404
N44 X18.504
N45 G1 X18.36 F1000.
N46 X15.532 Z-0.01
N47 G3 X18.25 Z-1.111 R6.8
N48 G1 X21.078 Z0.303
N49 G0 Z1.404
N50 X14.376
N51 G1 X11.902 F1000.
N52 X9.073 Z-0.01
N53 G3 X20. Z-5.8 R5.8
N54 G1 Z-40.8
N55 X22.828 Z-39.386
N56 X24.
N57 G0 X41.
N58 Z5.

N59 M9
N60 G91 G28 X0. Z0.
N61 G90
N62 M30
%

[HughesTooling]

Fusion is outputting the diameter, most modern lathes use diameter for the display and the G code so what Fusion's outputting will work if you set Mach3 up correctly.

Mark

[tes.guangzhou]

Hi Mark

I did it longer time ago.

But why the DRO of the X-axis, the absolute-positions of x-axis and in real-motion is still the double of all diameters?

[tes.guangzhou]

It is definitiv not the machine-settings, i tried the internal wizzard of MACH3 with a 55mm Stock and it worked perfectly.

[meboJ7ER2 · Accepted solution]

Hello

I had the same problem. I think you need to edit the post processor.

Please see this topic :

https://forums.autodesk.com/t5/computer-aided-machining-cam/newbie-having-problems-turning-a-simple-...

Cheers

Mikkel

[tes.guangzhou]

Hi Mikkel

Thx for your helping, you finally got it 😃

I mentioned the Postprocessor too but cant find the reason. Your reply was the solution 😃

The scale:2 has to change to Scale:1 and its right again. Thx a lot, you saved my day 😃

The fanuc_turning.cps post is setup for diameter mode.  It's been a while since I modified my post for radius as my control doesn't support diameter.  At minimum I know the xFormat needs to be changed to not scale by 2 like it is currently:

var xFormat = createFormat({decimals:(unit == MM ? 3 : 4), forceDecimal:true, scale:2}); // diameter mode

 Best regards, Alfred