I am using a 20×4 LCD and while it is running I can adjust the CNC speed with the knob. It starts out at 100% and I can go up to at least 300% and down to 0%. It has been helpful when I had too high of a speed when I was routing and I was able to slow it down.
When I did my test burn of Ryan’s logo you can see on the small one that the web address is not readable. This is because I had too much power or too little speed. I sped it up and the rest looked better. I then changed the speed in the laseretch software to the desire speed before I burnt the larger one.
I still have a lot to learn and I really appreciate the information you are sharing!!