Path in Fusion360 different from actual path

Hi,

I have the issue, that on moves between cuts, the CNC starts moving in X/Y before Z is fully lifted out of the hole. That very often kills the cutter. In Fusion360 those linking moves are shown as perfectly rectangular moves. The Previewer in LinuxCNC shows the linking moves with an arc at the top, where Fusion360 shows a sharp corner.

Does anybody know why this is, and how to prevent this issue?

Thanks,
Max

Maybe a path blending issue?

linuxcnc.org/docs/2.5/html/common/User_C...html#_path_following

I had something similar once while engraving. Sharp corners were rounded off because by default the G64 command was active. That also occurred during lifting of the tool.

It looks like G64 could be the issue. How can I disable that? Nowhere in my GCode I can find a G64. Is it somewhere in the machine configurations?

It's enabled by default. Have a look at the docs I linked above, it shows how to disable it are maybe better to adjust the tolerance to a small number. It's just a gcode command, you can add it to your pp.

Either add G61 to the top of each g code file or manually enter it in the mdi prior to starting a program. That will be exact path following.

I prefer to leave a bit of blending and usually do a G64 P.003 or G64 P.005 to each file to make sure it's always used with the file.

The lower acceleration your machine is capable of the more it will cut corners in G64 mode with no tolerance. Putting a bit of tolerance P will keep it from cutting corners and also not come to a complete stop like a G61 will on occasion