Probably start with something like 20mm/s. Then start sweeping speed and find the correct speed for the assigned power which gives a good greyscale. This 10% (relatively low) power setting is because the 40W laser is more than enough power to burn the top of the plywood. This means a black dot would be set to 26 (10% of S max)and a white dot is zero. Then set min power to 0% and max power to probably 10%. Now everything is basically aligned (this is not optimizing the granularity, but easiest to understand so I recommend starting with that). In LB go to Edit->Device Settings and set S value max to 255. Set $30 to 255, set $31 to 0, you do this in the console window of LB, $$ to confirm they were set.
White will give a power of 0, and black will give a power of 255. Greyscale images are processed in LB as 8bit, so there are only 256 distinct values. This also eliminates variabilities with respect to your image.
I had to create my own greyscale that has never been converted to jpg (only a BMP) which will add anomalies due to compression. Start with a greyscale test pattern I've attached. Min dot size: This is based on optics as 16 microsteps is more than enough res for our steppers.
#LIGHT BURN OR PHOTOGRAV FULL#
Photograv uses dithering for which is only on/off (1bit) and not needed for Paul's controller which has full PWM control. For a properly processed image I see no reason to set min to anything other than 0%. I've been doing a lot of engraving with a laser diode, so I have not fully characterized the ideal settings for the K40. Quote from tprothma on January 13, 2019, 2:34 am
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