Using Precision Piezo on CoreXY. Works fine as endstop.

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(William Batie) #1

Using Precision Piezo on CoreXY. Works fine as endstop. Also works fine as 3 Point bed leveling. Crashes on grid-leveling.
G32 code does the fallowing. Crashes into the X and Y endstops (do_home = false), tries to home Z (in space). If Z homing is tripped manually, the starts bed leveling routine (grid.size 5), but first 5 points are of bed in the Y0 direction. If I again manually trip Piezo then the first point in the in every set of 5 is off the bed in the X0 direction with the remaining 4 being OK.
G29 code again crashes into the X, Y home and the Z tries homing in space.
If during Z homing the Piezo is tripped manually, the leveling routine (do_home 5) works for all 25 points
All axes are home manually with G28 X Y, Moving to the center of the bed and G28 Z. Then return to G28 X Y, before issuing G29 or G32 command.
Config leveling is:

Z-probe

#gamma_min_endstop nc
zprobe.enable true Set to true to enable the Z-probe module. This is used to scan surfaces, and to calibrate parameters and compensate for non-planar surfaces.
zprobe.probe_pin 1.28^! Pin the probe is connected to.
zprobe.slow_feedrate 5 Speed in millimetres/second at which the probe seeks a surface.
zprobe.fast_feedrate 100 Speed in millimetres/second at which the probe does fast moves.
zprobe.return_feedrate 50 Speed in millimetres/second at which the probe does the return after a probe.
#zprobe.debounce_ms 1 Debounce the probe pin over this number of millisceconds. Set to 1 or 2 if your probe is too noisy and gives false readings.
zprobe.probe_height 5 Distance above the bed at which the probing is started, once the bed’s height is known.
zprobe.max_z 200 Maximum Z (was gamma_max)
zprobe.dwell_before_probing 0.2 Dwell time in seconds before probing
leveling-strategy.rectangular-grid.enable true

#################################################################################################################################

Levelling strategy

Example for 3-point levelling strategy, see wiki documentation for other strategies

leveling-strategy.three-point-leveling.enable true # a leveling strategy that probes three points to define a plane and keeps the Z parallel to that plane
leveling-strategy.three-point-leveling.point1 50.0,50.0 # the first probe point (x,y) optional may be defined with M557
leveling-strategy.three-point-leveling.point2 300.0,165.0 # the second probe point (x,y)
leveling-strategy.three-point-leveling.point3 50.0,300.0 # the third probe point (x,y)
leveling-strategy.three-point-leveling.home_first true # home the XY axis before probing
leveling-strategy.three-point-leveling.tolerance 0.03 # the probe tolerance in mm, anything less that this will be ignored, default is 0.03mm
leveling-strategy.three-point-leveling.probe_offsets 0,0,0 # the probe offsets from nozzle, must be x,y,z, default is no offset
leveling-strategy.three-point-leveling.save_plane false # set to true to allow the bed plane to be saved with M500 default is false

#################################################################################################################################

Levelling strategy

#leveling-strategy.rectangular-grid.enable true # The strategy must be enabled in the config, as well as the zprobe module.
#leveling-strategy.rectangular-grid.x_size 330 # size of bed in the X axis
#leveling-strategy.rectangular-grid.y_size 330 # size of bed in the Y axis
#leveling-strategy.rectangular-grid.size 5 # The size of the grid, for example, 7 causes a 7x7 grid with 49 points. # Must be an odd number.
#leveling-strategy.rectangular-grid.do_home false
#leveling-strategy.rectangular-grid.probe_offsets 0,0,0 # Optional probe offsets from the nozzle or tool head
#leveling-strategy.rectangular-grid.save false # If the saved grid is to be loaded on boot then this must be set to true
#leveling-strategy.rectangular-grid.initial_height 10 # will move to Z10 before the first probe
#leveling-strategy.rectangular-grid.dampening_start 0.5 # compensation decrease point (optional)
#leveling-strategy.rectangular-grid.height_limit 1 # no compensation to apply after this point (optional)
#mm_per_line_segment 1 # necessary for cartesians using rectangular-grid

Where when 3 point leveling is run the leveling-strategy is rem out and vice versa.

(William Batie) #2

Fixed the problem!!!
With a CoreXY printer, G32 crashes because when “leveling-strategy.rectangular-grid.probe_offsets 0,0,0 “ it jams the X, Y to 0, 0 disregarding the endstops.
With the Precision Piezo, since the Z-probe sensor is the nozzle itself, there is no displacement in any direction. There for I thought the setting of 0,0,0 should work, thus the crashes.
Changing the grid.probe_offsets for the X and Y to the edge of the bed printing area, in my case X = 30 and Y = 45; i.e., leveling-strategy.rectangular-grid.probe_offsets 30,45,0, put the nozzle at the edge of the printing area at the start of the G32 routine and everything works fine.
So with Smoothieware, using a Precision Piezo as Z-probe, It can do both Homing as an endstop and bed leveling-strategy.