laser raster engraving

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21 Oct 2018 14:01 #119157 by andypugh
Replied by andypugh on topic laser raster engraving

Galvanometer can achieve huge speeds & accelerations but for limited area.
I need an area about 100cmx150cm so only gantry system can do this.


Well, you could just make the machine very, very high. But I see your point

CoreXY might be fastest. I think it is normal to use mirrors and a stationary laser, but I have seen some laser modules that look small enough to mount on the head, which would probably save a lot of alignment difficulty.

This might interest you, he seems to be getting very good speed with a 30W laser (compared to his old 100W laser)
msraynsford.blogspot.com/2018/09/laser-c...peed-difference.html

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21 Oct 2018 14:24 #119158 by vre
Replied by vre on topic laser raster engraving
laser will be stationary with flying optics.
coreXY is not suitable because of backlash
with more length in belts the backlash increases in these speeds & accelerations.
I will do the classic design all lasers have with flying optics.
My laser source is an RF tube so this is the reason why i want high speeds
because RF tubes can engrave at high speeds.
To problem is that the existing laser controllers supports mutual exclusive
raster engraving by dithering or grayscale.
But the good quality photographic engraving combines dithering & grayscale.
So the only way to do it is with linuxcnc..

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22 Oct 2018 12:02 #119203 by Todd Zuercher

Galvanometer can achieve huge speeds & accelerations but for limited area.
I need an area about 100cmx150cm so only gantry system can do this.


What about mounting a glavo on a gantry and using it to raster say 5cm wide strips. That way the gantry would only need to do a slow scan while the galvo did the fast rastering.

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27 Oct 2018 05:42 #119501 by vre
Replied by vre on topic laser raster engraving
I want large continuous engravings
so this will not work also it is very complex

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