radius to end of arc differs from radius to start

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05 Jun 2021 10:59 #211206 by MarnikMakes
Hi all

I recently finished the retrofit on a Emco-F1 using linuxcnc. Everything seems to be working fine. For testing stuff i generated some simple G-code using Fusion360 and it worked perfectly. It was just some simple facing operation but it was good to get started. I now want to start working on my first project and i get this error: radius to end of arc differs from radius to start. I have looked at differend sources online but I can't get it figured out. What is the best course of action to take?
https://imgur.com/345r19h


Thanks in advace.

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05 Jun 2021 12:57 #211208 by tommylight
Tool to big for radius's in the gcode
Arc's to small for the given tool
starting work on an arc, this is usually when using "run from here"

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06 Jun 2021 18:59 #211319 by BigJohnT
I wrote an arc generator to help people understand what a correct arc G code is.

github.com/LinuxCNC/simple-gcode-generators/tree/master/arcgen

Usually with post processors the precision is not small enough and rounding introduces errors.

JT

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08 Jun 2021 23:06 #211558 by andypugh

i generated some simple G-code using Fusion360 and it worked perfectly. It was just some simple facing operation but it was good to get started. I now want to start working on my first project and i get this error: radius to end of arc differs from radius to start.


Which postprocessor are you using in Fusion360? If you use the LinuxCNC one then I think that it gives enough precision to avoid this issue. (But I only ever use it in metric, which might matter)

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