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Welcome to the grbl-L(-Mega) Wiki!

New features in the current CNCL release requires some GRBL compiler options changes. These compiler options are implemented in this GRBL fork to make it easy to compile and flash GRBL to an Arduino for running on a lathe. Read the Wiki Compiler Options for an explanation of the compiler options.
I have added spindle sync threading (G33) based on fschill grbl version to this Arduino Mega version GRBL-L-Mega and the Arduino Uno version GRBL-L. Ramps shields 1.4 and 1.6 are also supported. Read the threading setup Wiki for an explanation of the threading setup.
For all other information read the GRBL Mega Wiki.