Until recently I had not had a need to run my MillRight Mega V CNC at anywhere near max speed since my laser is only dual diode at 10W-15W output, the Neje A40640. Most etching and cutting is 1000mm/min or less. However, I’ve been etching powder coated stainless steel vessels recently and the power necessary to do this is relatively very low, so now I have the need to crank up the speed, and thus finally had a reason to test and enter values for Scanning Offset Adjustment. Holy Cow! This is an excellent feature of LB! It was easy to test and setup, just follow the guidance in the online LB documentation for this feature.
The flask in the picture was etched with specs: 6000mm/min, 60% power, Fill mode, 8.4% overscan, 0.09mm intervals, 0 deg scan angle, bi-directional, Cross-Hatch pattern (so 0 and 90 scan angles), 100% fine focus; followed by a sub-layer 3000mm/min, 30% power, Line mode, 100% fine focus.
If I were to run faster speeds (machine is capable of 16,000mm/min), then I’d consider bumping the overscan amount and fine tune the Scanning Offset Adjustment values even more. However, I found that bumping overscan diminishes the speed advantage, and I’m going to run out of laser power well before I approach even 10,000mm/min, so I’ve decided 6000mm/min is pretty darn good. I have to limit the acceleration to 400mm/sec/sec due to mechanical resonance in my machine, but certainly bumping that value is also an alternative to overscan bumping. I like where its at, I use the machine for plasma and routing also, so those processes are factored into these values also.
Cheers,
Lou