Hi guys, I have a Gweike Cloud RF and have had to set my scan off-set in lightburn for 300mm/s at 1.49 mm to remain inside the object I am engraving. This sounds quite a large scan off-set. Can anyone share what off-sets they are using at different speeds. Gweike online help was pretty vague to say the least.
Hello… welcome aboard…
I believe, scan offset is to fire the laser sooner or later. One laser may fire quickly while another may take longer… they need to fire at the right time.
I think it gets used to correct for mechanical backlash on a lot of these… 
My machine will run at least 1650mm/s, fun, but relatively not much use. I would think yours should run 500mm/s, but I don’t know…
And, yes the numbers are rather large…
Here is an old screenshot… you can see mine are a bit smaller…
I had something mechanical (belt) cause the shift above 350mm/s…I think @600mm/s it was around 0.04 or 5…
These belts are timing belts for engines and are designed to go one direction… we are using them kind of off label. When I put a better belt in mine, I got better results… It was also a different drive system…
It’s still back to mechanics… at least I’d start there.
@ednisley has a similar animal as mine… maybe he’s got an idea or suggestion…
Good luck…
For my ordinary CO₂ laser, the offset ranges from 0.0 mm at 50 mm/s up to 0.2 mm at 500 mm/s, which seems typical.
However, the electronics driving an RF laser certain differs from what’s behind a DC-excited glass tube, so I doubt there’s any way to directly compare the numbers.
Do your Line Shift values vary more-or-less linearly from the lowest speeds to the highest?
Except I’d expect less offset from an RF machine…
Me thinks it has mechanical issues…
Thank you for answering, and yes the error increases linearly with the speed. Gweike suggest that I do a machine calibration via their online tool but this appears to make very little difference. I am starting to think this may be a machanical issue. As the machine is still under warranty I just wanted to know if these values I am using were acceptable before I contact Gweike customer services again. Thank you for taking the time to message.
Good luck, let us know how it’s resolved…
Take care