The arduino mega is used in alot of 3d printer because of its more powerful processor but because of the relatively easy tasks of a cnc mill the arduino uno is enough. If you are not seeing the above image, you may see the following image below: [Caution: Unlocked] The GUI I'm using is the universal g code sender. Once reset if I type $H the motors churp "haha" but no actual movement and nothing else happens. seems to me that though the switch works when YOU push on it, it does not work when the axis pushes on it. $5=0 (Invert limit pins) It's not part of the g-code stream. Grbl is compatible with all atmega 328 based arduino boards, meaning that you could use a uno or a nano but not the mega as its atmega 2560 based. GRBL will automatically zero the machine position and all axis indicators when this is done. $131=420.000 (Y-axis maximum travel) The pull-off distance is defined by GRBL parameter $27 and is set to 1mm as default. AI - Artificial Idiocy. If you have updated and you have 2 axis limit switches... did you have changed config.h of grbl library to manage XY homing instead of XYZ homing? You will again have to edit the new config.h file. This is most easily accomplished by simply disconnecting GRBL panel from the machine and reconnecting. $32=1 (Laser-mode enable) 2 Posts. Wont be until the weekend now though. ['$H'|'$X' to unlock]. für Kreisbahnen … However, if you have a two axis machine you probably need a positive coordinate space. Now, this GRBL firmware can be installed in any version of the Arduino controller. Ahhha. $21=1 (Hard limits enable) Still not quite understanding something. $4=0 (step enable invert, bool) Nyelenih. One flashed you cannot edit the config.h settings. $2=0 (step port invert mask:00000000) Look for $22 Homing cycle, boolean. "although in homing mode the Z axis works flawlessly when it starts looking for x and y limit switches it just trods right on past the limit switch even though it is activated". Once uploaded i unlocked via $X and then tried $H (With no Limit Switches connected) i heard a very slight murmur from the X axis motor but no actual movement. Newbi try arduino with grbl 0,9j, tb6600, nema17, powersupply 24v 10A. $130=200.000 (x max travel, mm) #define HOMING_CYCLE_1 ((1<