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Bed auto Leveling change: Raise Z before homing

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- Added "Z_RAISE_BEFORE_HOMING" for raising Z the defined distance
before homing. This is useful to avoid Z-Probe collision when hotend is
near bed.

- Fixed the issue of Z not going bellow Z_PROBE_OFFSET when
"min_software_endstops" is true.
Now the Z_PROBE_OFFSET is not set in Z_MIN_POS, it is added after
homing.
This commit is contained in:
Alex Borro 2013-10-12 17:28:11 -03:00
parent dd3086d3f2
commit 6f85a8c7aa
2 changed files with 22 additions and 12 deletions
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10
Marlin/Configuration.h
View file

@ -309,7 +309,10 @@ const bool Z_MAX_ENDSTOP_INVERTING = true; // set to true to invert the logic of
#define X_PROBE_OFFSET_FROM_EXTRUDER -25
#define Y_PROBE_OFFSET_FROM_EXTRUDER -29
#define Z_PROBE_OFFSET_FROM_EXTRUDER -12.35
#define Z_RAISE_BEFORE_HOMING 4 // (in mm) Raise Z before homing (G28) for Probe Clearance.
// Be sure you have this distance over your Z_MAX_POS in case
#define XY_TRAVEL_SPEED 8000 // X and Y axis travel speed between probes, in mm/min
#define Z_RAISE_BEFORE_PROBING 15 //How much the extruder will be raised before traveling to the first probing point.
@ -330,12 +333,7 @@ const bool Z_MAX_ENDSTOP_INVERTING = true; // set to true to invert the logic of
#define Y_MAX_POS 205
#define Y_MIN_POS 0
#define Z_MAX_POS 200
#ifndef ENABLE_AUTO_BED_LEVELING
#define Z_MIN_POS 0
#else
#define Z_MIN_POS (-1*Z_PROBE_OFFSET_FROM_EXTRUDER) //With Auto Bed Leveling, the Z_MIN MUST have the same distance as Z_PROBE
#endif
#define X_MAX_LENGTH (X_MAX_POS - X_MIN_POS)
#define Y_MAX_LENGTH (Y_MAX_POS - Y_MIN_POS)

24
Marlin/Marlin_main.cpp
View file

@ -920,19 +920,28 @@ static void homeaxis(int axis) {
axis_home_dir = x_home_dir(active_extruder);
#endif
current_position[axis] = 0;
plan_set_position(current_position[X_AXIS], current_position[Y_AXIS], current_position[Z_AXIS], current_position[E_AXIS]);
// Engage Servo endstop if enabled
#ifdef SERVO_ENDSTOPS
#if defined (ENABLE_AUTO_BED_LEVELING) && (PROBE_SERVO_DEACTIVATION_DELAY > 0)
if (axis==Z_AXIS) engage_z_probe();
else
#endif
#if defined (ENABLE_AUTO_BED_LEVELING) && (PROBE_SERVO_DEACTIVATION_DELAY > 0)
if (axis==Z_AXIS) {
#if defined (Z_RAISE_BEFORE_HOMING) && (Z_RAISE_BEFORE_HOMING > 0)
destination[axis] = Z_RAISE_BEFORE_HOMING * axis_home_dir * (-1); // Set destination away from bed
feedrate = max_feedrate[axis];
plan_buffer_line(destination[X_AXIS], destination[Y_AXIS], destination[Z_AXIS], destination[E_AXIS], feedrate, active_extruder);
st_synchronize();
#endif
engage_z_probe();
}
else
#endif
if (servo_endstops[axis] > -1) {
servos[servo_endstops[axis]].write(servo_endstop_angles[axis * 2]);
}
#endif
current_position[axis] = 0;
plan_set_position(current_position[X_AXIS], current_position[Y_AXIS], current_position[Z_AXIS], current_position[E_AXIS]);
destination[axis] = 1.5 * max_length(axis) * axis_home_dir;
feedrate = homing_feedrate[axis];
plan_buffer_line(destination[X_AXIS], destination[Y_AXIS], destination[Z_AXIS], destination[E_AXIS], feedrate/60, active_extruder);
@ -1198,6 +1207,9 @@ void process_commands()
current_position[Z_AXIS]=code_value()+add_homeing[2];
}
}
#ifdef ENABLE_AUTO_BED_LEVELING
current_position[Z_AXIS] -= Z_PROBE_OFFSET_FROM_EXTRUDER; //Add Z_Probe offset (the distance is negative)
#endif
plan_set_position(current_position[X_AXIS], current_position[Y_AXIS], current_position[Z_AXIS], current_position[E_AXIS]);
#endif // else DELTA