80 lines
3.0 KiB
Markdown
80 lines
3.0 KiB
Markdown
# GCode Small-Move Remover
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PowerShell script that removes gcode cutting moves where X and Y coordinates differ from the previous kept position by less than or equal to a configurable threshold (default 0.0006). These near-zero moves cause Komo CNC machines to throw `ERROR: CRC Fault`.
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## Problem
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Komo controllers reject cutting moves where the actual displacement in X and Y is negligibly small. For example:
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```
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N7633 G1 X23.1756 Y27.9265 Z0.7700 F150.
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N7634 G1 X23.1757 Y27.9268 Z0.7700 F150. <-- dX=0.0001, dY=0.0003 (CRC Fault)
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N7635 G1 X23.1962 Y27.9797 Z0.7700 F150.
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N7636 G1 X23.1963 Y27.9799 Z0.7700 F150. <-- dX=0.0001, dY=0.0002 (CRC Fault)
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N7637 G1 X23.2163 Y28.0330 Z0.7700 F150.
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```
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Lines N7634 and N7636 move less than 0.0006 in both X and Y from the previous position, which Komo sees as invalid and halts with a CRC Fault error.
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## Solution
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The script parses `.OUT` gcode files and removes cutting move lines (G1, G2, G3) where **both** X and Y differ from the last kept position by less than or equal to the threshold, **and** there is no Z change. This eliminates the CRC Fault triggers while preserving all meaningful toolpath data.
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### What gets removed
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- G1/G2/G3 lines where dX <= threshold AND dY <= threshold AND Z is unchanged
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### What is always kept
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- **Z moves** - any line where Z changed is never removed
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- **G0 (rapid)** positioning lines
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- **G28** (home return) lines
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- **G52** (coordinate offset) lines
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- **M-codes**, comments, tool changes, and all other non-cutting lines
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## Usage
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```powershell
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# Basic - creates *_cleaned.OUT next to the original
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.\Remove-SmallMoves.ps1 -InputFile "C:\path\to\file.OUT"
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# Specify output file
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.\Remove-SmallMoves.ps1 -InputFile "file.OUT" -OutputFile "file_fixed.OUT"
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# Custom threshold
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.\Remove-SmallMoves.ps1 -InputFile "file.OUT" -Threshold 0.001
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```
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## Parameters
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| Parameter | Required | Default | Description |
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|-------------|----------|---------|-------------|
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| `InputFile` | Yes | - | Path to the input gcode file |
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| `OutputFile`| No | `*_cleaned.OUT` | Path for the cleaned output file |
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| `Threshold` | No | `0.0006`| Max X or Y difference for removal |
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## Example Output
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```
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GCode Small-Move Remover
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========================
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Threshold: <= 0.0006 in both X and Y
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Input: file.OUT (8864 lines)
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Output: file_cleaned.OUT (8310 lines)
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Removed: 554 lines
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Sample removed lines (first 20):
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Line 36 removed: X=28.0339 Y=25.8585 Z=0.77 (dX=0.0002, dY=0.0003, dZ=0)
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Line 47 removed: X=27.7644 Y=27.1713 Z=0.77 (dX=0, dY=0, dZ=0)
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...
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```
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## How It Works
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1. Reads the input file line by line
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2. Extracts X, Y, Z coordinates using regex
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3. For cutting moves (G1/G2/G3) only:
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- If Z changed significantly (> 0.0001), the line is always kept
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- If Z is the same, compares X and Y against the last kept position
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- If both dX and dY are within threshold, the line is removed
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4. Updates the last known X/Y/Z position from kept lines only (removed lines don't update position tracking) |