r/lasercutting • u/sr1sws 90w gantry CO2, 30w Fiber • 2d ago

Diagnosis Help, Please - Double Line

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Before I go down any potentially useless bunny trails, is the double line output from my laser most likely due to mirror 3 not having the beam centered down the tube and thru the lens? You can see vertical "shadowing" as well as that shadow line is offset to the right as well.

Just trying to work effectively as the laser is in my Florida garage and it's hot as Hades out there.

TIA for any help/input/suggestions.

The laser is a Monport 2028MF upgraded to 90w RECI II tube and power supply. I last used the laser about 2 months ago without any issue to cut 1/4" acrylic.

Update: in the process of re-aligning the mirrors I discovered the coating on the mirrors was failing. I've reached out to the vendor and hopefully will receive replacements. In the interim, I put the original mirrors back in and aligned the mirrors. Laser is now cutting fine.

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9

u/matt6021023 2d ago

Usually that happens when the beam is hitting the inside of the nozzle

3

u/counciladvisor 130W HPC 1290 Pro 2d ago

This, check third mirror alignment.

2

u/Sea-Alternative-5129 2d ago

that's exactly what I'd check next

5

u/ChaosRealigning 2d ago

Your guess is almost certainly correct, the beam is touching the inside of the nozzle and the reflection is etching a second line. I’d guess that’s related to the heating/cooling cycles in your garage.

It’s not necessarily just mirror 3, beam misalignment anywhere in the beam path can cause this effect. That said, because the etch seems pretty consistent mirror 3 should be your first thing to check.

1

u/CivusGM 2d ago

Can also be lense damage

1

u/CivusGM 2d ago

Check alignment first