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Z Trips When sending to Machine Zero

Discussion in 'OpenBuilds Forum Help' started by Art Gehr, Apr 26, 2020.

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  1. Art Gehr

    Art Gehr New
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    Looking for the correct settings or process.
    I have just set up my LeadMachine CNC 1010 with a Black Box controller. I was able to successfully run my first G Code with successful completion. I have set with homing sequence and soft limits to the actual machine size. After I complete the run I want the router to return to Machine zero and select the option to go to the machine zero G53 G0 Z0 from the GoTo section in the contoller software.

    This results in the Z moving up and contacting the limit switch and causing the alarm for the triggered limit switch. The response also recommends Re-homing.

    I changed the configuration homing feed and seek rate and the pull of distance:
    $20=1 ;Soft limits enable, boolean
    $21=1 ;Hard limits enable, boolean
    $22=1 ;Homing cycle enable, boolean
    $23=3 ;Homing direction invert, mask
    $24=50.000 ;Homing locate feed rate, mm/min
    $25=250.000 ;Homing search seek rate, mm/min
    $26=50 ;Homing switch debounce delay, milliseconds
    $27=6.000 ;Homing switch pull-off distance, millimeters

    Not sure if I am asking the system to do something it cannot or if my configuration is incorrect.
    Thanks...
    Art
     
    #1 Art Gehr, Apr 26, 2020
  2. David the swarfer

    David the swarfer OpenBuilds Team
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    this is quite normal, Z=0 is where the switch tripped so it will trip again if you go there (if it is at all accurate).

    it is then required to not go to 0 but instead to go just short of zero
    G53 G0 Z-5
    for example. the -5 can be changed to whatever suites your machine, so if -1mm is enough then use that

    most post processors allow for entering such an offset to allow for safe raised Z moves that do not trip switches.
    however, you may need to create a custom macro in CONTROL for this since you cannot edit the built in button.
    @Peter Van Der Walt
     
    #2 David the swarfer, Apr 27, 2020
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  3. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    #3 Peter Van Der Walt, Apr 27, 2020
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  4. Art Gehr

    Art Gehr New
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    Thanks David and Peter.
    I will work on the macro and reply how it works. May have to wait until tomorrow as it should hit 100 in the garage today.

    It appears that the debounce after homing doesn't affect Machine zero. That is it zeros when hitting the limit and moves off but zero is actually when the limit is change from closed to open or visa versa. So changing the debounce has no effect where machine zero is.
     
    #4 Art Gehr, Apr 27, 2020
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  5. Art Gehr

    Art Gehr New
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    Created a custom macro and I am able to get the Z to position -1. Not alarm even better. Thanks. Next I will try a marco to get them all to move, once I figure it out.

    thanks again.
     
    #5 Art Gehr, Apr 28, 2020
  6. David the swarfer

    David the swarfer OpenBuilds Team
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    go to machine home, safely raise Z first
    Code:
    G21 G90 G17   ; set default modes
G53 G0 Z-1    ; raise Z
G53 G0 X-1 Y-1 ; move X and Y to machine coordinates
    I have the hotkey CTRL+M assigned to this. 'M'achine home

    go to Work 0,0 safely
    Code:
    G21 G90 G17
G53 G0 Z-1
G0 X0 Y0
    I have CTRL-H assigned to this, for Work Home

    my macro hotkeys will always be CTRL+something because i do not want an accidental keypress to move the machine
     
    #6 David the swarfer, Apr 29, 2020
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  7. Art Gehr

    Art Gehr New
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    Thanks David,
    That works well. I just need to get my Black Box to connect and I will be good to go.

    Art
     
    #7 Art Gehr, Apr 30, 2020
  8. Art Gehr

    Art Gehr New
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    Thanks for the macros! Just what I was looking for.
     
    #8 Art Gehr, May 18, 2020
    Peter Van Der Walt and David the swarfer like this.

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