I am having a very hard time getting my laser to focus to be

Lasers
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1

I am having a very hard time getting my laser to focus to be able to cut through 3mm ply. I had it almost dead to right but my tube needed to be changed and it was hitting low. after an hour or two I got it to dead center of the cutting head but it still is not focusing enough to cut. I did the ramp test and still I could not find a spot where the line was thin and made it through the material. should I lower the tube even through it was hitting on the lower part of the circle and the tube was not level. or is something else presenting me from focusing

2

Stock k40 focal lens has a focal point of 50mm js your work at this distacne to the botton of the f/lens?.i had a damaged f/lens on my cutter.if the beam is spread at 50 mm form f/lens it is the f/lens [rised side goes up]- experance will tell here ,i clean my f/lens every 30 minutes at present as i sm getting a lot of moisture hitting the f/lens.do you have air assist?,i ask this as when i installed mine the beam was comptly cut off as was hitt the side of the air assist

3

I have upgraded the lens to A 18mm lens from light objects

4

@3D_Laser Checked so it is a 50.8 and not a 63.5 focus lens you got there? It may explain the missing thin line on the ramp test.
Or maybe it is a 63.5mm and you know it and have set the height correctly?

i cannot imagine anything else than mirror/lens problem

5

It’s the 50.8 before I replaced my tube it cut fine now I can’t get it to cut which makes me think the tube itself is misaligned as it seems to have good power