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A new Zero Focal Point needs to be determined when a new lens is being installed or when a new cutting head is being used. The Zero Focus Point is defined as the focus setting where as the focus is on the surface of the material.
Type of Systems: Materials / Conditions:
Note:
Auto Focus / Bypos Mirror 5” or 7.5” Cutting head with new lens HK25 or HK30 Nozzle Scotch Tape 2”x4” Manila Cardboard tags Steel blocks wide enough to sit across 2 grates (Setup) Pulse width single pulse 50ms (Setup) Laser Power single pulse 50w (Setup) Default setting, Focal length 5” 2.0 (Setup) Default setting, Focal length 7.5” 7.0
In determining a focal position, there are two sets of numbers on the cutting head. There is a Primary and a Secondary focal number. The Primary focal numbers are found on the front/upper portion of the cutting head. This number is read in increments of 6 or 6mm. (Example: 0,6,12,18) As the focus is full revolution. The Secondary focal numbers are found on the focal ring on the right side of the cutting head. The numbers are incremental with a 0.2mm adjustment. (One line = 0.2mm) (Five lines = 1.0mm)
1. 2. 3.
Bring the cutting head forward to the service position. Place steel blocks on the table and tape cardboard tags to the blocks. Adjust the focal ring. a. Set focal ring to 6/0 for the 5” head. b. Set focal ring to 6/30 for the 7.5” head. 4. Go into manual mode, load a parameter for the correct cutting head. 5. In Hand_Param, set the Focus to 0mm and nozzle distance to 0.2mm. 6. Install HK 25 or HK 30 nozzle and perform nozzle centering. 7. Turn Tool light off and lower the Z axis until the nozzle makes contact with the cardboard tag. (Ensure the nozzle is clear of the metal blocks.) 8. Take pulse shots on the card moving the Y axis in Jog mode by ½ revolution of the wheel. a. For the 5” cutting head, adjust the Setup_Default Setting, Focal Length 5” from 0 to 6 in increments of 0.5mm. b. For the 7.5” cutting head, adjust the Setup_Default Setting, Focal Length 7.5” from 5 to 20 in increments of 0.5mm. 9. Review the cardboard tag and look for the hole pattern big small big again. 10. Choose hole that falls in the approximate middle of the small pattern, not just the smallest hole. 11. Change your focus ring by the amount of difference between your original default focus setting and the chosen position from step 10. (Example – On the 5” head you end up with 3.8, lower the focus from 6/0 to 6/18.) 12. Change the Default Setting, Focal Length 5” or Default Setting, Focal Length 7.5” back to their original settings.
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