Frage LinuxCNC - No straight lines in the Backplot!

Hello,

I'm quite frustrated... I try to "simulate" the carving of a simple 20mmx20mmx10mm (with 5mm rounded corners) pocket with LinuxCNC. I've produced the gcode by using g-simple:



Below what I see in the "Backplot" windiw when I run the gcode in LinuxCNC:





As you can see, at the end of every straight path the router produces a curve (!). It doesn't stop and then goes up like it should do.


I'm not actually milling, I'm just observing the Stepcraft router going around with no piece on the worktable before going with the real milling.

I've double checked my Stepcraft configuration:

max axis velocity = 30 mm/s
max acceleration = 40 m/s^2

The tool has

Feed rate = 600 mm/minute (F600 instruction in the gcode)
Plunge rate = 100 mm/minute (F100 instruction in the gcode)

Homing and positioning (manually or via gcode) are perfect, the machine seems working like a charm. So... what's going on?
Obviously I could use a lower feed rate (let's say F300 or 300 mm/min), but even so I can note little curves and no straight lines in the Backplot window. With lower values I will go in pension before the milling ends...

Any clue?
I'm missing something?

Gefunden!

It's 'cause no G64 command was included in my gcode!
G64 states the maximum tolerance allowed in respect of the theoretic path. For example:

G64 P0.01 = The max allowed distance from the ideal path is 0.01 millimeters.

It's a good practice to add the command in the preamble of every gcode program (I was not aware of that, and G-simple doesn't put it as defaul behaviour).

Here below, the same pocket by including "G64 P0.01":