Getting gaps at corners and/or whenever the laser changes directions

[berainlb (PY)]

@capt835

I’ll give that a try but this is also their recommendation.

Interesting… They must have either changed the documentation or I’m looking at a different variation.

@capt835

I have to have the room completely dark or I change the S Value Max to 1000 and use the “Fire” button. Then I put the S Value Max back to 255.

Is that because LightBurn caps the value at 20%? You could potentially create a macro to create your own fire button although it wouldn’t work for framing.

F51 is 20% power when $30=255.

M3 F51 G1 

To disable

M5

@DougL

Isn’t the setting for the S value max 1000 for GRBL whether it’s an 8bit board or a 32bit board?

Arduino compatible boards all use 255 as value for $30. Discussed here with @JohnJohn:

Laser will not burn

It looks like this controller is an 8-bit controller based on Arduino according to this snippet taken from this site. Hopefully I’ve identified the correct machine. Controller Software: The Genmitsu 3018-PRO uses Grbl, high-performance open-source software for controlling movement, and runs on Arduino. In that case $30 = 255 would be the correct value. You would then want to make sure that S Value Max in LightBurn Device settings is also set to 255. It defaults to 1000.

In either case as you say it’s important that the value agrees with S Value Max.

Here’s the relevant portion in GRBL cpu_map.h file that shows this:

    // Variable spindle configuration below. Do not change unless you know what you are doing.
    // NOTE: Only used when variable spindle is enabled.
    #define SPINDLE_PWM_MAX_VALUE     255 // Don't change. 328p fast PWM mode fixes top value as 255.
    #ifndef SPINDLE_PWM_MIN_VALUE
      #define SPINDLE_PWM_MIN_VALUE   1   // Must be greater than zero.
    #endif
    #define SPINDLE_PWM_OFF_VALUE     0
    #define SPINDLE_PWM_RANGE         (SPINDLE_PWM_MAX_VALUE-SPINDLE_PWM_MIN_VALUE)
    #define SPINDLE_TCCRA_REGISTER    TCCR2A
    #define SPINDLE_TCCRB_REGISTER    TCCR2B
    #define SPINDLE_OCR_REGISTER      OCR2A
    #define SPINDLE_COMB_BIT          COM2A1

@jkwilborn

I would think your LED would be working at 1%…

Even the manual for @capt835’s laser refers to S100 and S200 values when assuming S1000 max. But from what I can tell this is for different controllers than what @capt835 has. That would put it in the 10-20% power category. This seems extremely high but hard to say without having familiarity with this specific module.