Omtech SH-F50 User Manual page 16

Step 4. If you previously disconnected the control computer, reconnect it via the USB cable now. If your computer is
already connected and EZCad is already running, restart it now to establish a connection between the computer
and the laser's control board.
Step 5. Customise your contrast and engraving depth by adjusting the engraving parameters in EZCad.
To darken an image, use a higher frequency setting. To lighten it, use a lower one. To increase engraving
depth, increase the amount of energy per unit area by reducing the speed parameter or increasing the laser's
power or the number of loops. Engraving too deep, however, reduces image quality, especially for coated
materials. Again, constantly using settings over 80% will shorten the expected service life of your laser.
Resolution should usually be set to 500 dots per inch. Reducing your image resolution can be helpful in some
cases, reducing flaming and increasing the energy of the pulse in a way that improves the quality of the resultant
image in some materials such as some plastics.
Step 6. Activate the laser guidance system by pressing Red or hitting F1 in EZCad. The design should be displayed
in red light on the worktable, showing where the laser will fire.
Step 7. Place an expendable piece of the material to be engraved in the location shown by the laser guidance. Do not
use a different target as the galvanometer lens automatically focuses at different heights for different materials.
Being careful that no part of your body is near the worktable or laser path, press Mark or hit F2 in EZCad to
fire the test laser. Alternatively, you can activate the laser by using the foot pad.
Step 8. The laser is invisible but will create a buzzing noise and sparks and begin engraving when it is correctly focused
on your test material. If no sparks are emitted, the laser is out of focus. Continue to fire it while adjusting the
laser arm up or down using the height adjustment wheel on the support column. Small, consistent sparks will
be emitted at the marking point when the beam is correctly in focus. Make a note of the correct height on the
support column's ruler for future reference.
In Focus
12
Out of Focus