76 lines
3.2 KiB
Markdown
76 lines
3.2 KiB
Markdown
---
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tag: g425
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title: Backlash Calibration
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brief: Use a conductive object to calibrate XYZ backlash
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author: marcio-ao
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experimental: true
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requires: CALIBRATION_GCODE
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group: calibration
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codes: [ G425 ]
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notes:
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- |
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Requires `CALIBRATION_GCODE` and the following parameters:
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- `CALIBRATION_MEASUREMENT_RESOLUTION` determines the increments taken in mm when performing measurements.
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- `CALIBRATION_FEEDRATE_SLOW`, `CALIBRATION_FEEDRATE_FAST` and `CALIBRATION_FEEDRATE_TRAVEL` determine the speed of motion during the calibration.
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- `CALIBRATION_NOZZLE_TIP_HEIGHT` and `CALIBRATION_NOZZLE_OUTER_DIAMETER` refer to the conical part of the nozzle tip.
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- `CALIBRATION_REPORTING` enables `G425 V` for reporting of measurements.
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- `CALIBRATION_OBJECT_CENTER` and `CALIBRATION_OBJECT_DIMENSIONS` define the true location and dimensions of a cube/bolt/washer mounted on the bed.
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- `CALIBRATION_MEASURE_RIGHT`, `CALIBRATION_MEASURE_FRONT`, `CALIBRATION_MEASURE_LEFT` and `CALIBRATION_MEASURE_BACK` define the usable touch points. Comment out any sides which are unreachable by the probe. For best results, all four sides should be reachable.
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- `CALIBRATION_PIN`, `CALIBRATION_PIN_INVERTING`, `CALIBRATION_PIN_PULLDOWN` and `CALIBRATION_PIN_PULLUP` configure the pin used for calibration. For example, if the nozzle is grounded, the calibation cube would be connected to a digital input pin with a pull-up enabled.
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parameters:
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-
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tag: B
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optional: true
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description: Perform calibration of backlash only.
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-
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tag: T
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optional: true
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description: Perform calibration of one toolhead only.
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values:
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-
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tag: index
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type: int
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-
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tag: V
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optional: true
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description: Probe cube and print position, error, backlash and hotend offset. (Requires `CALIBRATION_REPORTING`)
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-
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tag: U
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optional: true
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description: 'Uncertainty: how far to start probe away from the cube (mm)'
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values:
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-
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tag: linear
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type: float
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examples:
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-
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pre: 'Check positional accuracy before calibration (Requires `CALIBRATION_REPORTING`):'
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code:
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- T1 ; Switch to second nozzle
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- G425 V ; Showing positional report for T1
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- T0 ; Switch to first nozzle
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- G425 V ; Showing positional report for T0
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-
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pre: 'Perform automatic calibration:'
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code:
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- G425 ; Perform full calibration sequence
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- M425 F1 S0 ; Enable backlash compensation at 100%
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-
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pre: 'Check positional accuracy after calibration (Requires `CALIBRATION_REPORTING`):'
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code:
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- T1 ; Switch to second nozzle
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- G425 V ; Validate by showing report for T1
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- T0 ; Switch to first nozzle
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- G425 V ; Validate by showing report for T0
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---
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This command performs an automatic calibration of backlash, positional errors, and nozzle offset by touching the nozzle to the sides of a bed-mounted, electrically-conductive object (_e.g.,_ a cube, washer or bolt).
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This command measures backlash but doesn't enable backlash correction. Use [`M425`](/docs/gcode/M425.html) to enable backlash correction.
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