Setting Image Engraving Position in LaserGRBL — Nano Pro

When using LaserGRBL with the Nano Pro, understanding the coordinate system is essential for accurate positioning. By default, the zero point of the Nano Pro is located at the lower left corner of the working area. This means all engraving positions are calculated relative to this origin.

If you want to engrave a design at the center of the workspace, you need to manually calculate and apply an offset based on the size of the engraving area and the dimensions of the image.

Positioning Principle

Since the origin is at the lower left corner, placing a design at the center requires shifting the image from the origin to the midpoint of the working area.

This is done by calculating offset values for both the X and Y axes.

Offset Calculation

To center the image, use the following formulas:

Offset X = 80 − (Size_W / 2)

Offset Y = 70 − (Size_H / 2)

Where:

Size_W is the width of the image
Size_H is the height of the image

The values 80 and 70 represent the center coordinates of the Nano Pro working area along the X and Y axes.

Application in LaserGRBL

After calculating the offset values:

• Enter the calculated Offset X and Offset Y into the positioning settings in LaserGRBL
• Ensure the image size is correctly defined before applying the offset
• Verify the preview position to confirm the design is centered within the workspace

This method allows precise control over engraving placement, especially when alignment and symmetry are required.

Conclusion

Because the Nano Pro uses the lower left corner as the origin, centering an engraving requires manual offset calculation. By applying the correct offset values based on the image dimensions, users can accurately position designs in the center of the workspace.

Proper understanding of coordinate systems and positioning calculations ensures consistent and precise engraving results.