I’m trying to set up cylinder correction. The edges of the test box are not burning off as they should.
i have a Commarker 20w fiber. Focal dist is 333.5, lens dist is 30, so i used 363.5 in the cyl correction window. I’ve tried adjusting the cyl correction Mirror dist by ± 10,20 & 30 mm, with not much change.
Mug is 75mm DIA. and it is a straight mug, no taper.
#36 on the mug is the 333.5 distance. the rest are ± 10-30mm test.
I have a sublayer set up to engrave 90deg from main layer. Both are Bi-directional.
Same for Fiber or Diode machine not using a rotary. You are going out of the focus range. In other words, going too far down the sides of the cylinder. The term that applies is Depth of Focus (DOF).
I understand being out of the focus range, I had hoped that cylinder correction would get a wider range than what i’m getting. I’m only getting about 40mm of clear burn.
Unless cylinder correction moves the laser height, there will not be what you expect.
I think Cylinder Correction is to compensate for the perspective as you view tne result. Burning a circle on a curved surface looks distorted. The correction is to distort the burn so it looks okay.
Mike is right that cylinder correction merely pre-distorts the design, so that it is projected undistorted again on the curved surface.
As you guessed by now, that’s not how it works.
The “Depth of Field” of a lens is the usable range around the focal point. The effect on the material falls off the further away you are from the focal point due to the hourglass-shaped nature of the beam.
(A shorter lens has a smaller Depth of field)
This docs page explains some of this terminology:
If you set your focus partway into the mug instead of the top of it, you could be able to pull it off without using a rotary, but you might still see some variance at the different heights.
(Lower the power, if the fiber starts affecting the metal below the removed paint)
