![]() ![]() Lines that have been deleted are shown with a red “minus” sign and red highlight. The right-hand file contains the additional GRBL command sequences. The left-hand file contains the original Inkscape g-code. The end result from both approaches is the same.Īn example of post-processing using my “GcodePostProcessor” is shown in photo 1. insert the required M3,M5 code sequences into existing G-code using a post-processor.There are two distinctly different ways of doing this: any G-code that we send to the plotter now requires “special” code sequences for raising and lowering the pen. This solves one problem but creates another. but to access this pin we must replace the “spindle_control.c” code module within GRBL with code of our own. Pin 11 is an ideal candidate as the “Limit Z-Axis” function is not required when plotting. we need to borrow one of these pins to control our servo. Unfortunately GRBL has allocated another task to each of the PWM pins. Servo motors require pulse width modulation (PWM) signal to operate. ![]() This original program, and the source code, are attached to this instructable. “GcodePostProcessor (GPP)” inserts GRBL servo pen-lift commands into existing g-code. The solid blue line indicates when the servo arm should be up as the virtual pen traverses the letters ABC. The video shows GRBL controlling a servo motor using the pen-lift code sequences generated by “GcodePostProcessor”. The opening photo shows the results obtained when I ported GRBL to the CoreXY plotter described in. send the modified g-code to your plotter.insert the necessary pen-lift control codes using “GcodePostProcessor”,.create a g-code calibration file using Inkscape 0.92,. ![]()
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