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If a different frequency is required, this may be altered by editing the cpu_map.h file. (A compile time option exists to shift this linear model to start at a non-zero voltage.)īy default, the spindle PWM frequency is 1kHz, which is the recommended PWM frequency for most current Grbl-compatible lasers system. Intermediate output voltages are also assumed to be linear with laser power, such that 2.5V is approximate 50% laser power.

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0V should be treated as disabled, while 5V is full power. When laser mode is enabled, Grbl controls laser power by varying the 0-5V voltage from the spindle PWM D11 pin. You may wish to read the Two-Axis System Considerations page. If you're building a laser-grbl system, it's probably a two-axis system, since the Z axis is not usually needed. With laser mode disabled, Grbl will briefly pause upon any spindle speed or state change to give the spindle a chance to get up to speed before continuing. Milling operations require the spindle to get up to the right rpm to cut correctly and to be safe, helping to prevent a tool from breaking and flinging metal shards everywhere. WARNING: If you switch back from laser mode to a spindle for milling, you MUST disable laser mode by sending Grbl a $32=0 command. So, you can get super clean and crisp results, even on a low-acceleration machine!Įnabling or disabling Grbl's laser mode is easy. However, if a laser starts and stops like this for every spindle change, this leads to scorching and uneven cutting/engraving! Grbl's new laser mode prevents unnecessary stops whenever possible and adds a new dynamic laser power mode that automagically scales power based on current speed related to programmed rate. This is the normal operating procedure for a milling machine spindle. Every time a spindle state M3 M4 M5 or spindle speed Sxxx is altered, Grbl would come to a stop, allow the spindle to change, and then continue. The main difference between default Grbl operation and the laser mode is how the spindle/laser output is controlled with motions involved. Outlined in this document is how Grbl alters its running conditions for the new laser mode to provide both improved performance and attempting to enforce some basic user safety precautions. The Grbl project is not responsible for any damage or issues the firmware may cause, as defined by its GPL license. Please read and understand all related documentation for your laser prior to using it. They can instantly cause fires and permanently damage your vision. DISCLAIMER: Lasers are extremely dangerous devices.

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