Changed defaults for CoreXY Laser engraver

- activated laser mode
- x,y calibration adjusted
- limit switches at negative end used for homing

Author: RealNagus

grbl/defaults.h

@@ -452,6 +452,7 @@
   #define DEFAULT_HOMING_PULLOFF 1.0 // mm
 #endif
 
+/* Original defaults, modified below for laser engraver
 #ifdef DEFAULTS_RAMPS_BOARD
   #define DEFAULT_X_STEPS_PER_MM 80
   #define DEFAULT_Y_STEPS_PER_MM 80
@@ -488,5 +489,43 @@
   #define DEFAULT_HOMING_DEBOUNCE_DELAY 250 // msec (0-65k)
   #define DEFAULT_HOMING_PULLOFF 5.0 // mm
 #endif
+*/
+
+#ifdef DEFAULTS_RAMPS_BOARD
+  #define DEFAULT_X_STEPS_PER_MM 160  // 20 teeth GT2 pulley with 32x microstepping
+  #define DEFAULT_Y_STEPS_PER_MM 160
+  #define DEFAULT_Z_STEPS_PER_MM 4000
+  #define DEFAULT_X_MAX_RATE 10000.0 // mm/min
+  #define DEFAULT_Y_MAX_RATE 10000.0 // mm/min
+  #define DEFAULT_Z_MAX_RATE 300.0 // mm/min
+  #define DEFAULT_X_ACCELERATION 3000 
+  #define DEFAULT_Y_ACCELERATION 3000
+  #define DEFAULT_Z_ACCELERATION 100
+  #define DEFAULT_X_MAX_TRAVEL 210.0 // mm
+  #define DEFAULT_Y_MAX_TRAVEL 220.0 // mm
+  #define DEFAULT_Z_MAX_TRAVEL 200.0 // mm
+  #define DEFAULT_SPINDLE_RPM_MAX 1024.0 // rpm
+  #define DEFAULT_SPINDLE_RPM_MIN 0.0 // rpm
+  #define DEFAULT_STEP_PULSE_MICROSECONDS 10
+  #define DEFAULT_STEPPING_INVERT_MASK 0
+  #define DEFAULT_DIRECTION_INVERT_MASK 0
+  #define DEFAULT_STEPPER_IDLE_LOCK_TIME 255 // msec (0-254, 255 keeps steppers enabled)
+  #define DEFAULT_STATUS_REPORT_MASK 1 // MPos enabled
+  #define DEFAULT_JUNCTION_DEVIATION 0.02 // mm
+  #define DEFAULT_ARC_TOLERANCE 0.002 // mm
+  #define DEFAULT_REPORT_INCHES 0 // false
+  #define DEFAULT_INVERT_ST_ENABLE 0 // false
+  #define DEFAULT_INVERT_LIMIT_PINS 0 // false
+  #define DEFAULT_SOFT_LIMIT_ENABLE 1 // true
+  #define DEFAULT_HARD_LIMIT_ENABLE 0  // false
+  #define DEFAULT_INVERT_PROBE_PIN 0 // false
+  #define DEFAULT_LASER_MODE 1 // false
+  #define DEFAULT_HOMING_ENABLE 1  // true
+  #define DEFAULT_HOMING_DIR_MASK 3 // move positive dir (limits at MIN for X and Y)
+  #define DEFAULT_HOMING_FEED_RATE 500.0 // mm/min
+  #define DEFAULT_HOMING_SEEK_RATE 2000.0 // mm/min
+  #define DEFAULT_HOMING_DEBOUNCE_DELAY 250 // msec (0-65k)
+  #define DEFAULT_HOMING_PULLOFF 5.0 // mm
+#endif
 
-#endif
+#endif