Laser cuts 3-5 degree angle through wood and Acrylic

I have an issue with all my cuts having a slight angle in them. I have verified that my cutting table is level. The lens is clean and the laser beam appears to be centered on all mirrors. None of my cuts are 90 degrees through the material. It is consistently off on both sides of a square, circle, and rectangle. It is really noticeable when cutting 1/4" acrylic in 2x2 squares. Any ideas would be appreciated.

Thank you in advance,

Very likely your nozzle with mirrors nr3 and the lens is not at 90 degrees to your work table.
You can test it by lowering your table as much as possible and making a test shot, then, without moving your test subject, move your table as high as possible and shoot again. If you have not only one dot but 2 then you have an “angle problem”.


Or a drinking problem :smiley:

1 Like

Lasers have an hourglass beam at the cutting area aka kerf.

1 Like

That’s right, but if the angle is only to one side, then this is the most likely problem mentioned above.

it gets complicated if 2 laser beams come out AND you drink too much

This appears to be the issue, do you adjust the head with a square to get it straight then adjust the mirrors? or is this a molehill I’m turning into a mountain…

Have you ever used this product? Do I need to get this tool to make it easier?

It is almost better to fine tune your laser head after the deviation on your test subject, it takes some time but needs to be done. Loosen the screws only slightly and with a small plastic hammer or similar you can knock it in the right direction - very carefully. If it is in Y-direction you need to adjust, here with some types of nozzles it is necessary to put very thin material under the holder either at the top or under the lower part of the nozzle holder
I hope the translation does not ruin the meaning of what I want to say.

I have with interest seen some videos from this company and can well imagine that it can be a great help in adjusting one’s mirrors in general. But here and now … just loosen the bolts and get started :wink:

If your settings are reasonably ok, I do not think you need to adjust everything from scratch, 1 or 2 degrees corresponds to this short distance to a few tenths of a millimeter.

Is it bad forum to piggyback a question concerning the exact same thing I have going on with my brand new machine?

New 180w 1300X900 table.

I set up the machine, adjusted both the beam alignment and the beam path. I made sure I was center/center at every mirror, at every location when testing.

As soon as I cut some 1/2" thick acrylic, it was obvious the cuts being made on the Y axis were not vertical.

I loosened the screws holding the cutting head and ended up shimming it a full 1.08 mm before getting it to cut vertically. I have a pinpoint laser coming through the exact center of the cone.

When I look at the cutting head from the front of the machine, it looks like it is at least .05 degrees listing to the right. Everything in my head tells me this shouldn’t work and that the tube and cone should be 90 degrees to the aluminum beam on the Y axis.

I ran it all day this way until a neighbor came by and convinced me I was crazy. I disassembled the cutter head again, removed the shims and showed him how it was cutting on an angle. I replaced the shims to get back to where the cuts were once again vertical.

Am I crazy?

No not at all, if it works for you it is the right thing you have done. There is probably some angle that does not fit, but as long as you get the entire laser beam right through the nozzle hole and the focus fits, at a 90 degree angle to your material, it must be ok.

Agree. No matter what it looks like from the outside, as long as the laser is doing this:

then I guess you’re okay.

1 Like

Jeff, I like your graphic explanation and that it is also made in LightBurn :wink: :+1: