Ruida offset with lower laser power

[ednisley]

@Magier7

An offset can still be seen here

Have you measured the actual offsets at various speeds, then filled in the table? Remember to use half the measured distance.

@Magier7

lower performance at slower speeds

Until you fix the offset problem, there’s no point in wondering what else is going wrong.

With that in mind, lower speeds may require much lower power than you can get from a 100 W tube, because it will have a high firing threshold.

Worse, those very low powers tend to produce erratic firing that burn random speckles across the material. This will be worse with a high power tube, because the pulses producing the speckles tend to run at the tube’s full power:

Where Those Random Dots in Engravings Come From

It seems everybody engraving acrylic with a CO₂ laser has seen random speckles appearing in places where the design shows a blank. Regardless of the suggested remedy in the many threads on this topic, nothing stops the dots. It turns out the problem lies inside the high-voltage laser power supply, which occasionally fires the tube at random, even though the controller has disabled the supply’s output. Although I’ve measured only two power supplies, other folks report random dots regardless of t…

Basically, good engraving on a high power laser requires careful tuning with attention to fixing all the sources of error.

@bernd.dk

Acceleration and braking need a certain distance at a given speed

The Ruida controller computes the overscan distance from the Machine Settings speed & acceleration values, so there’s no external control… Those should be set to optimize the machine’s performance, but OEM values seem based on guesswork and cargo-culting, which leads me to think there’s some value in DIY tinkering.