gcode writing for marlin

hi all,
i am trying to generate my custom gcodes with rhino-grasshopper. but i need to understand better gcode mechanism. i am using this page as a source: [reprap.org]

so there is this to start:

Gnnn :	Standard GCode command, such as move to a point

it says G0 is rapid and G1 is normal speed. but are we determining these speeds in firmware? how can i change speed to something between? or slower than G1? (or faster if G0 is not the max?)

more questions will come as i go further with writing gcodes,

thanks

G0 and G1 are identical in marlin

You add a F parameter to specify the requested feed rate

eg. G1 X100 F4000

F is in mm per minute

The only thing in firmware is the maxfeed rate values, this is the max feedrate you can request, anything over that is just set to the max value.

Edited 2 time(s). Last edit at 09/03/2016 05:19AM by Dust.

thanks!

i was thinking feed rate was something else, my english failed me. had to google terms.