Ok thanks for looking at this. This issue has been driving me crazy.
I have a Chinese laser cutter. Model is DH130-80
It has two lasers.
A 120 watt and a 80 watt.
I have had issues with trying to align either one. So right now I am only focusing on aligning the 80 watt.
So I went through all the alignment steps a bunch of times already (Bearded Builds has some very good videos)
So in the photo
M1 is Mirror one
M2 is mirror two
and M3 is mirror three
The red dots on the mirrors shows where the laser hits when head is at that location
If I do an alignment along the Near side (right side) I can hit laser 3 dead on everytime.
If I check it close corner (right back) to far corner (left front) it is also dead on
If I check it along front from right to left it is also dead on
The issue is on the back from right to left the laser hits higher and higher and then as I move it towards the front it hits lower and lower till it gets to the front and is dead on.
Everything is bang on level. What on earth can I still be missing? Please help
It does seam like a 4th corner issue and I watched a totorial on how it can be fixed with minor adjustments of mirror 1 but this doesn’t fix my issue…
If I adjust mirror 1 then everything else goes out of wack.
Has anyone shimmed the track a bit?
Remember when aligning mirrors try not to focus on getting the spot at dead centre of the next mirror - it is far more important that the burn spot does not change position when the next mirror moves from as close as it can be, to as far away as it can go.
If it turned out that the position of the burn spot was too high on M2 after you had aligned M1, then you would have to either lower the tube slightly, or raise M2 and M3 mirrors slightly - it depends how the beam lands at M3 after aligning M2 and how much adjustment you have available at M3.
After you have the M1 beam perfectly parallel with Y, then do the same with X, and take the first spot close to the right side rather than in the middle (middle is not necessary and lessens the accuracy) .
My guess is that your M1 needs to be tilted up very slightly, and your M2 tilted downwards very slightly.
Because the bed is wide, it will be very important that m1 is perfect, before moving on to m2.
On those large machines I like to level them first to help ensure the chassis isn’t twisted. I use a good spirit level and place it on the y rails, and place on x gantry in the middle (check at back and front). You should have adjustment at the feet.
