View Full Version : How is this done?
Scott Alberts
11-08-2015, 2:35 PM
324936I've etched a few skateboards like this. And cannot figure out how to keep it from going out of focus on the two ends. I have Trotec speedy 300 just like they are using in this pic. Any ideas?
Clark Pace
11-08-2015, 3:38 PM
Not sure what lens you have but a longer focal length would help. Like a 2.5 or 3
Scott Alberts
11-08-2015, 4:06 PM
I have a 2.5. Wonder if a 4" would do it.
Keith Winter
11-08-2015, 6:17 PM
I have a 2.5. Wonder if a 4" would do it.
4" will help or you can color the end areas a different color and set the z to drop for that color on Job control if 4" won't do it
Scott Alberts
11-10-2015, 4:25 PM
Good idea.
Dave Sheldrake
11-10-2015, 7:33 PM
depth of field
Assume M^2 = 1
Input beam is 6mm in diameter
Depth of field and spot sizes for different lens's as follows.
50mm focal length:
Depth of field = 2mm
Spot size = 0.1mm
100mm focal length:
Depth of field = 7.5mm
Spot size = 0.2mm
200mm focal length:
Depth of field = 30mm
Spot size = 0.4mm
The depth of field is a total distance between Point A and point B where the spot stays within 1.4x the smallest spot diameter and is an equal distance from the smallest spot size in both the Z+ and Z- directions.
Short version, the total height change must be less than the depth of field for any given lens size
Samuel Espy
11-11-2015, 12:17 PM
Many skateboards are made via thin laminates which are formed into their curved shapes via a mold (often shaped foam) and a vacuum press. Using this route, one could engrave before forming. See http://www.roarockit.com/
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