My laser has started making this screech sound when I run it at slower speeds and lower power. I have a video on a engraving to cut that I did with mirror acrylic. 15/38/38 noise is non existent. 15power 38speed 38min speed. omtech 50W 3 years old.
I can’t hear it, but your laser only starts at the 12th second in the video.
What are your minimum settings? , please specify the units correctly so we’re talking about the same thing,
I don’t know what that means.
I know nothing about this machine…but I love the sounds laser engravers emit.
Is the first bit of the video, the sound of scanning/engraving and when the screeching begins..is that the sound of Air for cutting and circular/curving motion of the gantry.
Up to the 12th second, the ammeter shows no activity or only short pulses…, It’s hard to judge without seeing the file itself.
the first half of the video is the engraving part, then at 12 second the cutting starts and so does that screeching sound.
I’ve tried turning up the volume and the sound reminds me that I also rarely have “sound variations” with my laser at certain combinations of speed and power. It comes from my CO2 tube and is more like a crackling/high-frequency whistling sound. Since it’s only rare and only at certain power/speed settings, I think it’s a kind of resonance that hasn’t had any (negative) impact on the machine or my work.
it used to never make this noise at all thats why I am concerned about it. The laser beam its self will dim as well.
See, that’s an important piece of information that you didn’t mention before. If your Laser starts to have variations in its output power and sounds strange, then it could indicate either a faulty power supply or a faulty tube.
(My second last answer is based on the information you provided up to this point…)
To me, the sound seems to be coming from the power supply, a voltage leak from the flyback to the case. I’ve had similar problems; in some cases, it was the old tube, which generated very high resistance, and the power supply had a tendency to leak current to the case. It could also be the power supply. I have a machine operating with a similar noise, but without any visible problems. The strangest defect I’ve had that caused something similar was the tube’s negative wire breaking internally.