Trouble with Z axis/touch plate calibration

<pre> o100 sub G20 ( Set current Z position to 0 so that we will always be moving down ) G10 L20 P0 Z0 ( Probe to Z-.5 at F2 [Uses machine units, I work in inch, this is meant to be slow!] ) G38.2 Z-.25 f2 [b]( Set Z0 at point where probe triggers with offset of +1.004 [this is the thickness of my touch plate. You must adjust this for your plate / setup] ) (G10 L20 = Set Coordinate System // P - coordinate system 0-9 0 = Not active) G10 L20 P1 Z1.572[/b] ( Rapid up to Z.5 above the material ) (G10 L20 P1) (Use machine coordinates) G90 G53 G0 (Incremental mode) G91 (Rapid Z up 1 inches) G0 Z1 o100 endsub </pre>

# Generated by PNCconf at Fri Mar  3 16:12:30 2023 # Using LinuxCNC version:  Master (2.9) # If you make changes to this file, they will be # overwritten when you run PNCconf again [EMC] MACHINE = lcnc DEBUG = 0 VERSION = 1.1 [DISPLAY] DISPLAY = gmoccapy EMBED_TAB_NAME = Center_panel EMBED_TAB_LOCATION = ntb_preview EMBED_TAB_COMMAND = gladevcp -c gladevcp  -H gvcp_call_list.hal -x {XID} gvcp-panel.ui POSITION_OFFSET = RELATIVE POSITION_FEEDBACK = ACTUAL MAX_FEED_OVERRIDE = 2.000000 MAX_SPINDLE_OVERRIDE = 1.000000 MIN_SPINDLE_OVERRIDE = 0.500000 INTRO_GRAPHIC = linuxcnc.gif INTRO_TIME = 5 PROGRAM_PREFIX = /home/shawn/linuxcnc/nc_files INCREMENTS = 20in 10in 1in .5in .1in .05in .01in .005in .001in .0005in .0001in POSITION_FEEDBACK = ACTUAL # Jog Speed - Also sets Jog Speed in LCNC Axis Manual Control Screen only if lower than MAX_LINEAR_VELOCITY. Otherwise MAX_LINEAR_VELOCITY sets this value. # DEFAULT_LINEAR_VELOCITY = 2.00000 # Sets the Jog Speed/Max Velocity in LCNC Axis Manual Control Screen # MAX_LINEAR_VELOCITY = 2.00000 MIN_LINEAR_VELOCITY = 0.016670 DEFAULT_ANGULAR_VELOCITY = 12.000000 MAX_ANGULAR_VELOCITY = 180.000000 MIN_ANGULAR_VELOCITY = 1.6666671 EDITOR = gedit GEOMETRY = xyz CYCLE_TIME = 100 [FILTER] PROGRAM_EXTENSION = .png,.gif,.jpg Greyscale Depth Image PROGRAM_EXTENSION = .py Python Script PROGRAM_EXTENSION = .ngc,.NGC,.nc,.NC,.txt,.tap Gcode file png = image-to-gcode gif = image-to-gcode jpg = image-to-gcode py = python [TASK] TASK = milltask CYCLE_TIME = 0.010 [RS274NGC] PARAMETER_FILE = linuxcnc.var SUBROUTINE_PATH = macros [EMCMOT] EMCMOT = motmod COMM_TIMEOUT = 1.0 SERVO_PERIOD = 2000000 [HMOT] # **** This is for info only **** CARD0=hm2_7i76e.0 [HAL] HALUI = halui HALFILE = lcnc.hal HALFILE = custom.hal POSTGUI_HALFILE = custom_postgui.hal SHUTDOWN = shutdown.hal [HALUI] # MDI_COMMAND=o100 call [KINS] JOINTS = 4 KINEMATICS = trivkins coordinates=XYYZ kinstype=BOTH [TRAJ] COORDINATES =  XYYZ LINEAR_UNITS = inch ANGULAR_UNITS = degree DEFAULT_LINEAR_VELOCITY = 0.33 MAX_LINEAR_VELOCITY = 3.33 [EMCIO] EMCIO = io CYCLE_TIME = 0.100 TOOL_TABLE = tool.tbl TOOL_CHANGE_QUILL_UP = 1 [MACROS] MACRO = touch_plate_z #****************************************** [AXIS_X] MAX_VELOCITY = 3.3333333333333335 MAX_ACCELERATION = 90.0 MIN_LIMIT = -0.001 MAX_LIMIT = 44.761 [JOINT_0] TYPE = LINEAR HOME = 0.2 FERROR = 0.5 MIN_FERROR = 0.05 MAX_VELOCITY = 3.3333333333333335 MAX_ACCELERATION = 90 # The values below should be 25% larger than MAX_VELOCITY and MAX_ACCELERATION # If using BACKLASH compensation STEPGEN_MAXACCEL should be 100% larger. STEPGEN_MAXVEL = 4.17 STEPGEN_MAXACCEL = 112.5 P = 500 I = 0 D = 0 FF0 = 0 FF1 = 1 FF2 = 0 BIAS = 0 DEADBAND = 0 MAX_OUTPUT = 0 # these are in nanoseconds DIRSETUP   = 8000 DIRHOLD    = 5000 STEPLEN    = 5000 STEPSPACE  = 5000 STEP_SCALE = 10170.17 MIN_LIMIT = -0.001 MAX_LIMIT = 44.761 # Distance traveled off limit switch once switch is triggered HOME_OFFSET = -0.100000 HOME_SEARCH_VEL = -0.833333 HOME_LATCH_VEL = 0.033333 # Speed from HOME_OFFSET to final HOME location HOME_FINAL_VEL = 0.000000 HOME_USE_INDEX = NO HOME_IGNORE_LIMITS = YES HOME_SEQUENCE = 1 #****************************************** #****************************************** [AXIS_Y] MAX_VELOCITY = 3.3333333333333335 MAX_ACCELERATION = 90.0 MIN_LIMIT = -0.001 MAX_LIMIT = 49.851 [JOINT_1] TYPE = LINEAR HOME = 2.703 FERROR = 0.5 MIN_FERROR = 0.05 MAX_VELOCITY = 3.3333333333333335 MAX_ACCELERATION = 90 # The values below should be 25% larger than MAX_VELOCITY and MAX_ACCELERATION # If using BACKLASH compensation STEPGEN_MAXACCEL should be 100% larger. STEPGEN_MAXVEL = 4.17 STEPGEN_MAXACCEL = 112.5 P = 500 I = 0 D = 0 FF0 = 0 FF1 = 1 FF2 = 0 BIAS = 0 DEADBAND = 0 MAX_OUTPUT = 0 # these are in nanoseconds DIRSETUP   = 8000 DIRHOLD    = 5000 STEPLEN    = 5000 STEPSPACE  = 5000 STEP_SCALE = -10159.9564 MIN_LIMIT = -0.001 MAX_LIMIT = 49.851 HOME_OFFSET = 0.100000 HOME_SEARCH_VEL = -0.933333 HOME_LATCH_VEL = 0.333333 HOME_FINAL_VEL = 0.900000 HOME_IGNORE_LIMITS = YES HOME_USE_INDEX = NO HOME_SEQUENCE = -2 [JOINT_2] TYPE = LINEAR HOME = 2.703 FERROR = 0.5 MIN_FERROR = 0.05 MAX_VELOCITY = 3.3333333333333335 MAX_ACCELERATION = 90 # The values below should be 25% larger than MAX_VELOCITY and MAX_ACCELERATION # If using BACKLASH compensation STEPGEN_MAXACCEL should be 100% larger. STEPGEN_MAXVEL = 4.17 STEPGEN_MAXACCEL = 112.5 P = 500 I = 0 D = 0 FF0 = 0 FF1 = 1 FF2 = 0 BIAS = 0 DEADBAND = 0 MAX_OUTPUT = 0 # these are in nanoseconds DIRSETUP   = 8000 DIRHOLD    = 5000 STEPLEN    = 5000 STEPSPACE  = 5000 STEP_SCALE = -10159.9564 MIN_LIMIT = -0.001 MAX_LIMIT = 49.851 HOME_OFFSET = 0.100000 HOME_SEARCH_VEL = -0.933333 HOME_LATCH_VEL = 0.333333 HOME_FINAL_VEL = 0.900000 HOME_IGNORE_LIMITS = YES HOME_USE_INDEX = NO HOME_SEQUENCE = -2 #****************************************** #****************************************** [AXIS_Z] MAX_VELOCITY = 0.5 MAX_ACCELERATION = 50.0 MIN_LIMIT = -5.251 MAX_LIMIT = 0.001 [JOINT_3] TYPE = LINEAR HOME = -0.2 FERROR = 0.5 MIN_FERROR = 0.05 MAX_VELOCITY = 0.5 MAX_ACCELERATION = 50.0 # The values below should be 25% larger than MAX_VELOCITY and MAX_ACCELERATION # If using BACKLASH compensation STEPGEN_MAXACCEL should be 100% larger. STEPGEN_MAXVEL = 0.62 STEPGEN_MAXACCEL = 62.5 P = 500 I = 0 D = 0 FF0 = 0 FF1 = 1 FF2 = 0 BIAS = 0 DEADBAND = 0 MAX_OUTPUT = 0 # these are in nanoseconds DIRSETUP   = 8000 DIRHOLD    = 5000 STEPLEN    = 2500 STEPSPACE  = 2500 STEP_SCALE = 10304.26 MIN_LIMIT = -5.251 MAX_LIMIT = 0.001 HOME_OFFSET = -0.100000 HOME_SEARCH_VEL = 0.500000 HOME_LATCH_VEL = -0.033333 HOME_FINAL_VEL = 0.000000 HOME_USE_INDEX = NO HOME_IGNORE_LIMITS = YES HOME_SEQUENCE = 0 #******************************************

# Generated by PNCconf at Fri Mar  3 16:12:30 2023 # Using LinuxCNC version:  Master (2.9) # If you make changes to this file, they will be # overwritten when you run PNCconf again loadrt [KINS]KINEMATICS loadrt [EMCMOT]EMCMOT servo_period_nsec=[EMCMOT]SERVO_PERIOD num_joints=[KINS]JOINTS loadrt hostmot2 loadrt hm2_eth board_ip="10.10.10.10" config="num_encoders=1 num_pwmgens=0 num_stepgens=4 sserial_port_0=00xxxx"  setp    hm2_7i76e.0.watchdog.timeout_ns 5000000 loadusr -W hal_input -KRAL Logitech Gamepad F310 loadrt pid names=pid.x,pid.y1,pid.y2,pid.z,pid.s loadrt mux16 names=jogspeed addf hm2_7i76e.0.read          servo-thread addf motion-command-handler   servo-thread addf motion-controller        servo-thread addf pid.x.do-pid-calcs       servo-thread addf pid.y1.do-pid-calcs       servo-thread addf pid.y2.do-pid-calcs       servo-thread addf pid.z.do-pid-calcs       servo-thread addf pid.s.do-pid-calcs       servo-thread addf jogspeed                 servo-thread addf hm2_7i76e.0.write         servo-thread setp hm2_7i76e.0.dpll.01.timer-us -50 setp hm2_7i76e.0.stepgen.timer-number 1 # external output signals # --- ESTOP-OUT --- net estop-out  =>     hm2_7i76e.0.7i76.0.0.output-00 # --- ROUTER-ON --- net coolant-mist   =>     hm2_7i76e.0.7i76.0.0.output-08 # --- DUST-COLLECTOR-ON net coolant-flood   =>  hm2_7i76e.0.7i76.0.0.output-01 # external input signals # --- ESTOP-EXT --- net estop-ext     <=  hm2_7i76e.0.7i76.0.0.input-04 # --- BOTH-HOME-X --- net both-home-x     <=  hm2_7i76e.0.7i76.0.0.input-05-not # --- HOME-Y1 --- net home-y1     <=  hm2_7i76e.0.7i76.0.0.input-06-not # --- BOTH-HOME-Y2 --- net both-home-y2     <=  hm2_7i76e.0.7i76.0.0.input-07-not # --- BOTH-HOME-Z --- net both-home-z     <=  hm2_7i76e.0.7i76.0.0.input-08-not #******************* #  AXIS X JOINT 0 #******************* setp   pid.x.Pgain     [JOINT_0]P setp   pid.x.Igain     [JOINT_0]I setp   pid.x.Dgain     [JOINT_0]D setp   pid.x.bias      [JOINT_0]BIAS setp   pid.x.FF0       [JOINT_0]FF0 setp   pid.x.FF1       [JOINT_0]FF1 setp   pid.x.FF2       [JOINT_0]FF2 setp   pid.x.deadband  [JOINT_0]DEADBAND setp   pid.x.maxoutput [JOINT_0]MAX_OUTPUT setp   pid.x.error-previous-target true # This setting is to limit bogus stepgen # velocity corrections caused by position # feedback sample time jitter. setp   pid.x.maxerror 0.000500 net x-index-enable  <=> pid.x.index-enable net x-enable        =>  pid.x.enable net x-pos-cmd       =>  pid.x.command net x-pos-fb        =>  pid.x.feedback net x-output        <=  pid.x.output # Step Gen signals/setup setp   hm2_7i76e.0.stepgen.00.dirsetup        [JOINT_0]DIRSETUP setp   hm2_7i76e.0.stepgen.00.dirhold         [JOINT_0]DIRHOLD setp   hm2_7i76e.0.stepgen.00.steplen         [JOINT_0]STEPLEN setp   hm2_7i76e.0.stepgen.00.stepspace       [JOINT_0]STEPSPACE setp   hm2_7i76e.0.stepgen.00.position-scale  [JOINT_0]STEP_SCALE setp   hm2_7i76e.0.stepgen.00.step_type        0 setp   hm2_7i76e.0.stepgen.00.control-type     1 setp   hm2_7i76e.0.stepgen.00.maxaccel         [JOINT_0]STEPGEN_MAXACCEL setp   hm2_7i76e.0.stepgen.00.maxvel           [JOINT_0]STEPGEN_MAXVEL # ---closedloop stepper signals--- net x-pos-cmd    <= joint.0.motor-pos-cmd net x-vel-cmd    <= joint.0.vel-cmd net x-output     => hm2_7i76e.0.stepgen.00.velocity-cmd net x-pos-fb     <= hm2_7i76e.0.stepgen.00.position-fb net x-pos-fb     => joint.0.motor-pos-fb net x-enable     <= joint.0.amp-enable-out net x-enable     => hm2_7i76e.0.stepgen.00.enable # ---setup home / limit switch signals--- net both-home-x     =>  joint.0.home-sw-in net both-home-x     =>  joint.0.neg-lim-sw-in net both-home-x     =>  joint.0.pos-lim-sw-in #******************* #  AXIS Y1 JOINT 1 #******************* setp   pid.y1.Pgain     [JOINT_1]P setp   pid.y1.Igain     [JOINT_1]I setp   pid.y1.Dgain     [JOINT_1]D setp   pid.y1.bias      [JOINT_1]BIAS setp   pid.y1.FF0       [JOINT_1]FF0 setp   pid.y1.FF1       [JOINT_1]FF1 setp   pid.y1.FF2       [JOINT_1]FF2 setp   pid.y1.deadband  [JOINT_1]DEADBAND setp   pid.y1.maxoutput [JOINT_1]MAX_OUTPUT setp   pid.y1.error-previous-target true # This setting is to limit bogus stepgen # velocity corrections caused by position # feedback sample time jitter. setp   pid.y1.maxerror 0.000500 net y1-index-enable  <=> pid.y1.index-enable net y1-enable        =>  pid.y1.enable net y1-pos-cmd       =>  pid.y1.command net y1-pos-fb        =>  pid.y1.feedback net y1-output        <=  pid.y1.output # Step Gen signals/setup setp   hm2_7i76e.0.stepgen.01.dirsetup        [JOINT_1]DIRSETUP setp   hm2_7i76e.0.stepgen.01.dirhold         [JOINT_1]DIRHOLD setp   hm2_7i76e.0.stepgen.01.steplen         [JOINT_1]STEPLEN setp   hm2_7i76e.0.stepgen.01.stepspace       [JOINT_1]STEPSPACE setp   hm2_7i76e.0.stepgen.01.position-scale  [JOINT_1]STEP_SCALE setp   hm2_7i76e.0.stepgen.01.step_type        0 setp   hm2_7i76e.0.stepgen.01.control-type     1 setp   hm2_7i76e.0.stepgen.01.maxaccel         [JOINT_1]STEPGEN_MAXACCEL setp   hm2_7i76e.0.stepgen.01.maxvel           [JOINT_1]STEPGEN_MAXVEL # ---closedloop stepper signals--- net y1-pos-cmd    <= joint.1.motor-pos-cmd net y1-vel-cmd    <= joint.1.vel-cmd net y1-output     => hm2_7i76e.0.stepgen.01.velocity-cmd net y1-pos-fb     <= hm2_7i76e.0.stepgen.01.position-fb net y1-pos-fb     => joint.1.motor-pos-fb net y1-enable     <= joint.1.amp-enable-out net y1-enable     => hm2_7i76e.0.stepgen.01.enable # ---setup home / limit switch signals--- net home-y1     =>  joint.1.home-sw-in net home-y1     =>  joint.1.neg-lim-sw-in # net home-y1     =>  joint.2.pos-lim-sw-in #******************* #  Tandem AXIS Y2 JOINT 2 #******************* setp   pid.y2.Pgain     [JOINT_2]P setp   pid.y2.Igain     [JOINT_2]I setp   pid.y2.Dgain     [JOINT_2]D setp   pid.y2.bias      [JOINT_2]BIAS setp   pid.y2.FF0       [JOINT_2]FF0 setp   pid.y2.FF1       [JOINT_2]FF1 setp   pid.y2.FF2       [JOINT_2]FF2 setp   pid.y2.deadband  [JOINT_2]DEADBAND setp   pid.y2.maxoutput [JOINT_2]MAX_OUTPUT setp   pid.y2.error-previous-target true # This setting is to limit bogus stepgen # velocity corrections caused by position # feedback sample time jitter. setp   pid.y2.maxerror 0.000500 net y2-index-enable  <=> pid.y2.index-enable net y2-enable        =>  pid.y2.enable net y2-pos-cmd       =>  pid.y2.command net y2-pos-fb        =>  pid.y2.feedback net y2-output        <=  pid.y2.output # Step Gen signals/setup for tandem axis setp   hm2_7i76e.0.stepgen.02.dirsetup        [JOINT_2]DIRSETUP setp   hm2_7i76e.0.stepgen.02.dirhold         [JOINT_2]DIRHOLD setp   hm2_7i76e.0.stepgen.02.steplen         [JOINT_2]STEPLEN setp   hm2_7i76e.0.stepgen.02.stepspace       [JOINT_2]STEPSPACE setp   hm2_7i76e.0.stepgen.02.position-scale  [JOINT_2]STEP_SCALE setp   hm2_7i76e.0.stepgen.02.step_type        0 setp   hm2_7i76e.0.stepgen.02.control-type     1 setp   hm2_7i76e.0.stepgen.02.maxaccel         [JOINT_2]STEPGEN_MAXACCEL setp   hm2_7i76e.0.stepgen.02.maxvel           [JOINT_2]STEPGEN_MAXVEL # ---closedloop stepper signals--- net y2-pos-cmd    <= joint.2.motor-pos-cmd net y2-vel-cmd    <= joint.2.vel-cmd net y2-output     => hm2_7i76e.0.stepgen.02.velocity-cmd net y2-pos-fb     <= hm2_7i76e.0.stepgen.02.position-fb net y2-pos-fb     => joint.2.motor-pos-fb net y2-enable     <= joint.2.amp-enable-out net y2-enable     => hm2_7i76e.0.stepgen.02.enable # ---setup home / limit switch signals--- net both-home-y2     =>  joint.2.home-sw-in net both-home-y2     =>  joint.2.neg-lim-sw-in net both-home-y2     =>  joint.2.pos-lim-sw-in #******************* #  AXIS Z JOINT 3 #******************* setp   pid.z.Pgain     [JOINT_3]P setp   pid.z.Igain     [JOINT_3]I setp   pid.z.Dgain     [JOINT_3]D setp   pid.z.bias      [JOINT_3]BIAS setp   pid.z.FF0       [JOINT_3]FF0 setp   pid.z.FF1       [JOINT_3]FF1 setp   pid.z.FF2       [JOINT_3]FF2 setp   pid.z.deadband  [JOINT_3]DEADBAND setp   pid.z.maxoutput [JOINT_3]MAX_OUTPUT setp   pid.z.error-previous-target true # This setting is to limit bogus stepgen # velocity corrections caused by position # feedback sample time jitter. setp   pid.z.maxerror 0.000500 net z-index-enable  <=> pid.z.index-enable net z-enable        =>  pid.z.enable net z-pos-cmd       =>  pid.z.command net z-pos-fb        =>  pid.z.feedback net z-output        <=  pid.z.output # Step Gen signals/setup setp   hm2_7i76e.0.stepgen.03.dirsetup        [JOINT_3]DIRSETUP setp   hm2_7i76e.0.stepgen.03.dirhold         [JOINT_3]DIRHOLD setp   hm2_7i76e.0.stepgen.03.steplen         [JOINT_3]STEPLEN setp   hm2_7i76e.0.stepgen.03.stepspace       [JOINT_3]STEPSPACE setp   hm2_7i76e.0.stepgen.03.position-scale  [JOINT_3]STEP_SCALE setp   hm2_7i76e.0.stepgen.03.step_type        0 setp   hm2_7i76e.0.stepgen.03.control-type     1 setp   hm2_7i76e.0.stepgen.03.maxaccel         [JOINT_3]STEPGEN_MAXACCEL setp   hm2_7i76e.0.stepgen.03.maxvel           [JOINT_3]STEPGEN_MAXVEL # ---closedloop stepper signals--- net z-pos-cmd    <= joint.3.motor-pos-cmd net z-vel-cmd    <= joint.3.vel-cmd net z-output     => hm2_7i76e.0.stepgen.03.velocity-cmd net z-pos-fb     <= hm2_7i76e.0.stepgen.03.position-fb net z-pos-fb     => joint.3.motor-pos-fb net z-enable     <= joint.3.amp-enable-out net z-enable     => hm2_7i76e.0.stepgen.03.enable # ---setup home / limit switch signals--- net both-home-z     =>  joint.3.home-sw-in net both-home-z     =>  joint.3.neg-lim-sw-in net both-home-z     =>  joint.3.pos-lim-sw-in #****************************** # connect miscellaneous signals #****************************** #  ---coolant signals--- net coolant-mist      <=  iocontrol.0.coolant-mist net coolant-flood     <=  iocontrol.0.coolant-flood #  ---probe signal--- net probe-in     =>  motion.probe-input #limits debounce to stop false triggers loadrt debounce cfg=1 #change to the number you want setp debounce.0.delay 100 #this sets the delay 100 iterations of the servo-thread addf debounce.0 servo-thread net deb-probe-in debounce.0.0.in <= hm2_7i76e.0.7i76.0.0.input-09-not net probe-in debounce.0.0.out net probe-in => motion.probe-input #  ---motion control signals--- net in-position               <=  motion.in-position net machine-is-enabled        <=  motion.motion-enabled #  ---digital in / out signals--- #  ---estop signals--- net estop-out     <=  iocontrol.0.user-enable-out net estop-ext     =>  iocontrol.0.emc-enable-in #  ---toolchange signals for custom tool changer--- net tool-number             <=  iocontrol.0.tool-prep-number net tool-change-request     <=  iocontrol.0.tool-change net tool-change-confirmed   =>  iocontrol.0.tool-changed net tool-prepare-request    <=  iocontrol.0.tool-prepare net tool-prepare-confirmed  =>  iocontrol.0.tool-prepared

[MACROS] MACRO = touch_plate_z

o<touch_plate_z> sub #<PlateThickness> =      .739   ( Subtract .018 from actual plate thickness! Thickness of your touch plate when proving in the Z orientation, this is used to re-calculate your new zero after touching off ) #<FastProbe> =            5     ( This is the probe speed used for your initial search, this should be a slow value to avoid damaging your tool, but doesn not need to "crawl"  ) #<SlowProbe> =             2     ( This is the probe speed for the final search, this should be a very slow value to improve the accuracy of the probing ) #<ZProbeRange> =          -.50   ( This is the distance the probe will travel on its initial search before erroring out, should be a negative value ) #<ProbeLift> =             0.10  ( This is the distance the probe will lift off the touch plate prior to starting the second search ) #<ProbeRetract> =         1.00   ( This is the distance the probe will lift from the touch plate after succesful probing to allow for removal of the plate ) ( Set current Z position to 0 so that we will always be moving down ) G10 L20 P0 Z0 ( Probe quickly for initial contact ) G91 F[#<FastProbe>] G38.2 Z[#<ZProbeRange>] ( Move off plate for slow search ) F[#<SlowProbe>] G1 Z[#<Probelift>] ( Pause for 0.5 Sec ) G4 P0.5 ( Slow probe search ) g38.2 Z[-2 * #<ProbeLift>] ( Move up to set new zero ) G1 Z[#<ProbeRetract>] F[#<FastProbe>] ( Set Z0 at point where probe triggers with offset of plate thickness) G10 L20 P0 Z[#<ProbeRetract> + #<PlateThickness>] o<touch_plate_z> endsub M2