The Machine moves. I see a blue light. Power on 100% . But not engraving. If i choose grbl engraving not a problem only whit single line the laser not stop between the letters. engrave a stripe from letter to letter and a stripe to the beginning on the end.
What version of GRBL are you using? If it’s older than 1.1f you will need to use the GRBL-M3 device in LightBurn. If it is 1.1f or later, enable Laser Mode by setting $32=1 in the console.
Your profile lists your machine as “homemade” - what we’re looking for there is what kind of laser, controller, firmware, etc you have, so we don’t have to ask all the time. 
cronos board GRBL 0.9J laser: 10W Engraving Industrial Laser/445nm Focusable TTL 10W Blue Laser Module
Sorry the Cronosmaker is GRBL 0.9J.
Thanks to all . Problem solved 255 to 1000 was the answer.
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