Hi all, I am novice in laser engraving (but I have nice experience with 3d printers) but can’t figure out the problem.. I have fuzzy lines on y Acmer P2. Now it has long frame (800x420 mm) and actually I don’t know were this problem or not with usual 420x400 frame. I did grungetest and I don’t know what to do next. I’ve already tightened all screws and belts. All the same. And result is suimilar on 20000, 15000, 10000 and 6000 mm/min
Considering what has already been verified regarding belt tightness and tension, and assuming that the image represents the result of one recording and not several on top of each other, the following occurs to me:
Very unlikely (since you have experience with 3D), but are the belts suitable for the pulleys, and do both the belts and the pulleys have teeth in good condition?
Does the power supply maintain a stable voltage throughout the process, or does it drop too much?
In another topic, a somewhat similar problem is also being discussed. Another issue is whether it will be necessary to adjust the power of the drives, since the motors have a greater path to travel with the increase in the frame size.
Yes, all belts and pulleys are in good condition ( laser is almost new, maybe 20-30 working hours). I dont test a voltage, but manufacturer didn’t mention anything about PSU change (it’s official upgrade part). But as I understand testing right, my problems are with X axis (420mm)? Or not? on photos X - right left, and Y - up down
Although that size puts the additional length in the X axis, the machine description and expansion kit description show it in the Y axis, which would account for the oscillations in that direction:
In addition to Y axis belt tension and anchoring …
- Make sure the laser head cannot move in its mount; the locking lever may need adjustment to properly secure the head.
- Some folks have found stripped screw threads in the head mounting bracket that will allow some motion, so check those for proper installation.
- Make sure the bearing followers on the Y axis rails cannot wiggle and their brackets supporting the gantry are secure.
Because the oscillations are fairly sharp, my guess is that the head is loose or the gantry can wiggle. If that’s due to an assembly mistake / oversight, the cause may be buried deep inside the machinery where you can’t see it from the outside.
Don’t be afraid to take things apart to verify what’s going on inside, but take plenty of pictures to eliminate questions when you rebuild it. 
Usually yes.
But there may be very specific setups that are the opposite. I don’t know of any, but I don’t see why they couldn’t exist.
In my opinion the possibility of electric/command issue is very low but not impossible.
Focus your attention on mechanical problems. Loose parts, debris, imperfections that can cause irregular movement, leading to the problems you see.
Yeah I already checked laser head and tighten it before, did this again today and sliced M3 threads 
but with new m4 its the same story… After that I changed rail bearing for X axis because with hand moving it seemed a little bit “steppy” for me. But it’s the same vobbling again.. I think I try to return short Y axes back next to see the result, but it takes some time. But without belts bearing on Y move nice.
With belts it should move nicely too. It’s just a little stiff due to the belts tension.
A simple method used to check if the belt tension is correct is to tilt the machine at 45º and a smooth movement of the axis in that direction should spontaneously begin.
Perhaps you already know this, but I don’t know how much you know about the subject. 
Hi again, a little update what I’ve done:)
I checked again all belts (tried all variation of tightening 
), all screws and pulleys - all is fine.
Tried to use rotation Y axis - and I still can feel a vibration in X by hand (even when there is no laser module in head. When I use rotation instead of X axis (or just take out stepper motor cable for any axis) there are vibrations on Y also. I can’t notice any visible vibrations on Rotary tool but its all rubber and I have nothing round now to test marking on high speed.. So, right now i can see two variants - if there will be vibrations on Rotary also, - so the problem can be in power/motherboard, and if not - problems with 2 steppers (low chances as I think?) orI don’t know what else it can be😂.
And a little notice. If I do some circles series, firs one is much better than others (it still has some vaves, but not so strong)
An experiment that doesn’t cost much to try and better understand the mystery.
Draw a square and engrave it. Then try sending the laser from one corner of the square to the opposite corner at 45º (diagonally) with the fire button on at a power that marks the material at the speed the laser moves.
You send the laser to the opposite corner at 90º (in a line) and again make a diagonal but with less intensity so as to lightly mark the material. You will create a cross with two intensities inside a square.
The idea is to check if the intensity of the laser affects anything in the displacements of the axes.
I’ll try that tomorrow, but I think it will not affect. I’ve already did same test with circles with only 5% power, and vibrations on hand were the same.
Yes, I know, but I intend to see the behavior in a straight line and on a 45º plane with different intensities.
The problem will be mechanical, and you just haven’t encountered it yet. But, within the little I understand that it could affect it, I want to rule out other possibilities. I would have already connected a voltmeter (or even an oscilloscope) to the power supply to check the voltage behavior. But I’m the one who finds it easy to do. Not everyone has the tools for everything.
Silly question. What is the condition of the gutter surface?
I haven’t forgotten that you have experience with 3D printers, but I had to ask. 
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