hello Jedi

[Dimitri Ruau]

Hello,
I am new to laser cutting. I have a ChinaCNCZone model SL-1060, 100W, Ruida RD6445G and a 63.5mm focal length lens.
I would like to cut 3 or 4 mm plywood, but someone told me it would be better with a 50,8 mm focal length.
The problem is that I have an autofocus on the machine, so I don't think I can fit a lens with a smaller focal length.
What do you think?
Sorry if I'm not putting my question in the right place, I'm not a social networker.
Glad to be your family.
Dimitri.


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[Pete Cyr]

Welcome Dimitri. Recommend backing up your vendor settings.

[Gene Uselman]

Russ has a new video on cutting with different lenses [sarbar multimedia on Youtube] and you don't have to use the auto focus - determine the best focus and then adjust the lense tube or the Z axis to properly focus. With a hundred watts I would first try the longer focal length lens.

[Dimitri Ruau]

Thanks for your answers guys.
Gene Uselman do you think that with the 63,5 mm focal length, it would be good for 3, 4 mm plywood with a 100W laser ?
Thanks

[Gene Uselman]

That should be fine- I have a 130w and have always used a 2" [50mm] and I can cut 6mm easily. I have obtained some longer focal lenses that I will be experimenting with when I have the alignment problems sorted on our newest laser. As the media gets thicker my belief is that a strong Air Assist pump is more and more important. I use a shop air compressor and have Russ' Ultimate Air Assist modified further for more control of the Air assist.