G0 Feedrate

Tanuki44 · August 2017

Hello,

I use also my printer 3D with the CNC mode.

Can you confirm that G0 not use by defaut the variable :

MAX_FEEDRATE_X or MAX_FEEDRATE_Y

That it's necessary to write for every G0 line the feedrate Fxxxx as like :

G0 X133 F6000

Thanks

Repetier · August 2017

G0 and G1 are identical and both share last set feedrate and have same speed limits.

Tanuki44 · August 2017

Ok, this is a little inconvenience, some post processors do not add the feedrate to the G0

because it is considered that the speed is setting in the controller by a variable or the max value of the axis.

Thanks.

RAyWB · August 2017

had same "problem" so feel free to use:

https://github.com/RAyWB/Additions-for-Repetier-Firmware/tree/master/CustomEventsFull

you just can pick out the G0/G1 section if you want to

Tanuki44 · August 2017

I only add these two files in the firmware folder?

Is it directly functional for PRINTER_MODE_CNC or does it need to implement case 0?

     switch (com-> G) {
         case 0: // G0 -> G1
         case 1: // G1

Thank you for your help !

Tanuki44 · August 2017

With the help of your code, I simply modified the file 'Commands.cpp'

In :
void Commands::processGCode(GCode *com)

        case 0: // G0
                  {
                      // select faster axis max feed rate for g0,other axis speed is limited by maxFeedrate
                      if( Printer::maxFeedrate[X_AXIS]>=Printer::maxFeedrate[Y_AXIS])
                              Printer::feedrate = Printer::maxFeedrate[X_AXIS];//use faster axis max Feedrate for G0
                      else Printer::feedrate = Printer::maxFeedrate[Y_AXIS];

                      PrintLine::queueCartesianMove(ALWAYS_CHECK_ENDSTOPS, true);
                  }

        case 1: // G1

For me :
After a G0 code, the next G1 always contains the Fxxxx, It is not necessary to temporarily store the speed of the last G1.
A gcode G0 is always a rapid move, I have not set a condition (Printer, Laser or CNC)

Thanks again

RAyWB · August 2017

the way i wrote the code matches the standards i know , so i suggest to take the whole section for the case you change your cam software ;-)

G0 Feedrate

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