Wrong Focal Length Despite The Merged Red Dots - Omtech LYF-175S User Manual

7.2 Wrong Focal Length Despite the Merged Red Dots

Generally, the right focal length is reached when the two red dots emitted by the red light guider
merges into one. However, this indicator of focal length is subject to the changes in laser sources
and field lenses.
The focal length of this machine is ___________ mm. This length is the distance measured from the
center line of the galvanometer to the surface of the engraving material.
To make sure the red light guiders indicate the right focal length:
1. Place a sample material on the worktable.
2. Turn the focus adjustment knob to move the
lens head close to the best focus point.
3. Turn on the machine and the red-light
guider. (See §5.2.1 Turning on the Machine
on Page 33)
4. Make sure the computer is connected to the
machine and start the EZCad.
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