When engraving, objects appear twice (shadow)

[ojaatka (Olivier Jankovsky)]

Hi,

I have the following result when engraving:

The design has no “shadows”

The laser has closed loop stepper and the axis is driven via a timing belt.

I don’t think there is any backlash.

What other cause could it have?

[Rick (Technical Evangelist)]

Hard to see detailed scan lines from the image posted. What does a simple 100mm x 100mm square with a larger interval look like? Anything like this, possibly? Scanning Offset Adjustment - LightBurn Software Documentation

[ojaatka (Olivier Jankovsky)]

Hi Rick,

thanks for the information, I’ll look into it very carefully and get back to you.
At first glance, this looks very promising.

Olivier

[ojaatka (Olivier Jankovsky)]

Hi Rick,

Thanks for the hint, it was indeed the scanning offset.
I have determined a few values and entered, now the result is much better.

I would like to know if the values are very high for my machine (or the power supply)?
Maybe I need a new power supply?

Here are my values:

{
“ScanOffsets”: [
{
“LineShift”: 0.25,
“Speed”: 100,
“StartAdjust”: 0
},
{
“LineShift”: 0.4399999976158142,
“Speed”: 200,
“StartAdjust”: 0
},
{
“LineShift”: 0.49000000953674316,
“Speed”: 300,
“StartAdjust”: 0
},
{
“LineShift”: 0.6100000143051147,
“Speed”: 400,
“StartAdjust”: 0
},
{
“LineShift”: 0.800000011920929,
“Speed”: 500,
“StartAdjust”: 0
}
]
}

Does that seem high to you? The axis has 900 mm and closed loop stepper.

kr,
Olivier