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Satvik Mishra
6c8e313283
Several links pointed at heading anchors that no longer exist (renamed or moved sections), so they did not jump to the intended section. Update them to the current anchors, and use a relative path for the sample-pwm-tool.cfg link so it resolves like the other config links. Signed-off-by: Satvik Mishra <Satvikmishra.ipu146183@maims.ac.in>
62 lines
1.9 KiB
Markdown
62 lines
1.9 KiB
Markdown
# Using PWM tools
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This document describes how to setup a PWM-controlled laser or spindle
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using `pwm_tool` and some macros.
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## How does it work?
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With re-purposing the printhead's fan pwm output, you can control
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lasers or spindles.
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This is useful if you use switchable print heads, for example
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the E3D toolchanger or a DIY solution.
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Usually, cam-tools such as LaserWeb can be configured to use `M3-M5`
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commands, which stand for _spindle speed CW_ (`M3 S[0-255]`),
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_spindle speed CCW_ (`M4 S[0-255]`) and _spindle stop_ (`M5`).
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**Warning:** When driving a laser, keep all security precautions
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that you can think of! Diode lasers are usually inverted.
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This means, that when the MCU restarts, the laser will be
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_fully on_ for the time it takes the MCU to start up again.
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For good measure, it is recommended to _always_ wear appropriate
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laser-goggles of the right wavelength if the laser is powered;
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and to disconnect the laser when it is not needed.
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Also, you should configure a safety timeout,
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so that when your host or MCU encounters an error, the tool will stop.
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For an example configuration, see [config/sample-pwm-tool.cfg](../config/sample-pwm-tool.cfg).
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## Commands
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`M3/M4 S<value>` : Set PWM duty-cycle. Values between 0 and 255.
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`M5` : Stop PWM output to shutdown value.
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## Laserweb Configuration
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If you use Laserweb, a working configuration would be:
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GCODE START:
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M5 ; Disable Laser
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G21 ; Set units to mm
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G90 ; Absolute positioning
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G0 Z0 F7000 ; Set Non-Cutting speed
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GCODE END:
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M5 ; Disable Laser
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G91 ; relative
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G0 Z+20 F4000 ;
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G90 ; absolute
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GCODE HOMING:
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M5 ; Disable Laser
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G28 ; Home all axis
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TOOL ON:
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M3 $INTENSITY
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TOOL OFF:
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M5 ; Disable Laser
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LASER INTENSITY:
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S
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