CNC-Macros

Enhanced CNC Macros for Klipper Firmware

Drawing inspiration from Klippy-cnc (https://github.com/vladbabii/klippy-cnc/tree/master), this collection of CNC macros is specifically designed for 3-axis CNC machines like the 3018 / 3040 / 6040, but should work on any. It brings advanced capabilities in workspace management, custom movement commands, and specialized operations for CNC machining, elevating precision and functionality.

The macros make use of the built-in SET_GCODE_OFFSET command to set the workpiece offset.

Features

• Workspace Management: Comprehensive set of macros for defining, adjusting, and recalling workspace coordinates.
• Custom Command Overrides: Customizes standard G-code commands to incorporate workspace offset.
• Specialized Operations: A range of specific macros tailored for tasks like slab flattening and probing.
• Enhanced Machine Control: Macros for controlling the spindle, emergency stops, and firmware restarts, augmenting safety and ease of use.

File Structure

• workspaceMacro.cfg: Dedicated to workspace coordinate management.
• codeOverrides.cfg: Contains overrides for default macros and custom G-code/M-code commands.
• customOperations.cfg: Features macros for specific CNC tasks and operations.

Combined, these files significantly improve control, accuracy, and safety in CNC machining using Klipper firmware.

Usage

1. Download the .cfg files or clone the repo into ~/printer_data/config or your chosen directory.
2. add the [save_variables] section to your printer.cfg:

[save_variables]
filename:/home/pi/printer_data/config/savedVariables.cfg

3. Include the .cfg files in your printer.cfg:

[include CNC-Macros/codeOverrides.cfg]
[include CNC-Macros/workspaceMacro.cfg]
[include CNC-Macros/customOperations.cfg]

Processes

Simple Job Setup

1. Home the machine.
2. Jog to the start position (e.g., stock Top, Front, Left as 0,0,0 in Fusion 360 CAM).
3. Use SET_OFFSET_FROM_TOOL to set X, Y, Z offsets.
4. Optionally, use SAVE_OFFSETS to save offsets to a file.
5. Start the job.
6. Profit.

Probing

Two methods for probing metal workpieces:

1. Alligator Clips: Attach to the endmill and the metal piece.
2. Z Puck Probe: Like this one from AliExpress.

With alligator clips, you can probe X, Y, and Z positions.

For X and Y Probing:

1. Install a 4mm endmill or rod.
2. Attach clips to endmill and workpiece.
3. Position the tool close to the workpiece.
4. Use START_PROBE_AXIS with variables.
5. The toolhead moves in 0.1mm increments until contact.

For Z Probing:

• Use the actual endmill for correct height offset.

G-Code Macros

Workspace Macros

Essential for CNC precision, these macros manage workspace coordinates and adjust movements accordingly.

To Do: Explore using Klipper's SET_GCODE_OFFSET.

Macro	Description
SAVE_OFFSETS	Saves current workspace offsets to the Raspberry Pi.
LOAD_OFFSETS	Loads saved workspace offsets, reinstating workspace positions.
CHECK_OFFSET_XYZ	Displays current workspace offsets with warnings if unset.
SET_OFFSETS_FROM_TOOL	Sets tool's current position as workspace offsets.
UPDATE_OFFSETS_XYZ	Manually set/update workspace offsets for X, Y, Z.
ZERO_OFFSETS_XYZ	Resets workspace offsets to zero.
WORKSPACE	Utility macro to report current workspace offsets.
ADJUSTED_MOVE	Applies workspace offsets to movement commands with safety checks.

Built-In Overrides

Enhanced control and functionality for CNC operations through macro overrides and custom commands.

Macro	Description
FW_RESTART	Executes a firmware restart.
EStop	Triggers an emergency stop (M112).
PAUSE	Saves position, stops spindle, moves Z to max height. Needs update for state saving.
RESUME	Restores spindle speed and position from saved state.
CANCEL_PRINT	Raises Z, stops spindle, turns off motors.
G28	Custom homing sequence, homes Z first.