1. NC point location of laser focus position
To determine the position of the laser focus, place a flat, smooth piece of white cardboard on the bench and position the laser cutting head above it.
The height of the cardboard focusing lens should be approximately 10mm, which is smaller than the focal length of the lens. For example, if the focal length of the lens is 127mm, the lens should be adjusted to about 117mm from the cardboard.
The NC system sets the cutting head to move every 10 mm along the X or Y axis, and the Z axis moves up 1 mm with each movement. The distance for 20 consecutive moves can be set.
With each movement, 20 holes are drilled 20 times and the height of the Z axis is increased by 20 mm. When observing the 20 holes, it can be seen that the diameter of the holes gradually changes from large to small and then from small to large.
Locate the position where the opening is smallest and record it. The distance from the cardboard to the lens at this position is the actual position of the laser beam focus.
2. Bevel f focus c auterium l method
The method is as follows:
Place a straight wooden board diagonally on the countertop at an angle of approximately 10 degrees.
Place the cutting head at Point A, with the height dimension of the focusing lens being 20 mm less than the focal length of the lens.
The NC system sets the cutting head to move continuously along the X-axis or Y-axis for a distance of 230 mm.
The laser produces 200W of continuous laser when the movement starts and stops when the cutting head stops.
At this point, a laser beam burn trace can be seen, which changes from wide to narrow and then from narrow to wide.
Take the narrowest point of the line as the focal position and record it.
In this position, the distance from the wooden plate to the lens is the actual position of the laser beam focus.
3. Laser cutting direct cauterization method
To determine the focusing position of the laser beam, hold a straight wooden board at an 85-degree angle on the cutting table. Raise the cutting head so that the focus lens is about 1.5 times in focus relative to the table surface.
Open the laser shutter and continuously emit a 200W laser beam. Move the wooden board horizontally under the focusing lens.
The surface of the wooden board will have a burn line that changes from wide to narrow and from narrow to wide before and after the laser beam is focused. This trait is very similar to the change in the laser beam focusing process.
Take the narrowest point of the line as the focal position and record it. The distance from the wooden plate to the lens at this position is the actual position of the laser beam focus.
Please note that this method requires manual operation and special attention must be paid to safety to avoid injury.
