[doubts about the Gcode generated by Cura]

thank you very much, I had already consulted the wiki Gcode, and there was where I read about the accelerations, but I had not read that with the Marlin does not work.

Regards

 

[doubts about the Gcode generated by Cura]

Hi All,

First of all thanks in advance for any help you can give me , I have some doubts about the code generated by Cura :oops: . my question is regarding the speed and acceleration (Feedrate). If I took a piece of code from a G code file I can see the following.

;TYPE:CUSTOM

M92 E600.000000

M140 S100.000000

M109 S230.000000

M190 S100.000000

;Sliced C:Users....Acoples v3 8mm y 12mm.stl at: Sun 20 Jan 2013 22:00:28

;Basic settings: Layer height: 0.35 Walls: 2 Fill: 30

;Print time: 0:49

;Filament used: 3.48m 29.72g

;Filament cost: 0.59

G21 ;metric values

G90 ;absolute positioning

M107 ;start with the fan off

G28 X0 Y0 ;move X/Y to min endstops

G28 Z0 ;move Z to min endstops

G92 X0 Y0 Z0.0 E0 ;reset software position to front/left/z=0.0

G1 Z5.0 F60

G92 E0 ;zero the extruded length

G1 F200 E3

G92 E0 ;zero the extruded length again

G1 F1800

;LAYER:0

;TYPE:SKIRT

G1 X26.75 Y92.553 Z0.63 F1800.0

G1 F2400.0

G1 E4.5

G1 F1800.0

G1 X28.774 Y98.575 Z0.63 F900.0 E5.1381

G1 X33.086 Y104.853 E5.903

G1 X37.983 Y109.749 E6.5985

G1 X42.017 Y112.775 E7.105

 

Reading the code I have the following doubts ,

:?: 1)

If we look at the line where it is written,

G1 Z5.0 F60

I understand making a move on the z axis at set speed by F60 (60mm/min), but two lines later we can see written

G1 F200 E3

Is this the same? i.e, moving on the axis E three millimeters at F200 speed.

:?: 2)

If we continue reading the code, we find the next:

G1 F1800

;LAYER:0

;TYPE:SKIRT

G1 X26.75 Y92.553 Z0.63 F1800.0

The first line sets the speed (G1 F1800) and the second defines a movement and speed, if I trust what is written in the Wiki about Gcode,

“Will set a feedrate of 1800 mm/minute, then do the move described above accelerating to a feedrate of 1800 mm/minute …”

But in this code the feedrate is the same, Does that mean there is no acceleration? then is a movement at a constant speed? Then why has added the first line?

:?: 3)

And my last question (for now)

If we continue reading the code, we find the next:

G1 F1800.0

G1 X28.774 Y98.575 Z0.63 F900.0 E5.1381

The first line sets the speed (G1 F1800), but in the second line, there is a speed command between the Z coordinate and E coordinate, How this command affects? Does this only defines the feedrate for Extruder, Is it an acceleration command for the XYZ system? Or, Is it an feedrate command for the XYZ system?

Thank in advance :rolleyes: