Wrong laser shot

[GonchiGD (Gonzalo Garcia)]

Good morning,

First of all, I wanted to apologize for my level of expression since I am using a translator.

I recently acquired an OMTech 7050 60W machine, after calibrating the mirrors I encountered two problems, the first was double engraving that I was able to solve thanks to an option offered by LightBurn by adjusting the displacement lines.

The second problem that I cannot find the solution to is, as you will see in the images, the laser engraves random points at the end of the test lines.

I thought it could be because the laser beam reflected inside the head, but I have everything adjusted to the center, I’ll show you in some images.

Thank you!!

[jkwilborn (Jack Wilborn)]

I think we’ve seen this before… This link was the discussion. @ednisley traced it down to a bad lps. The signals say don’t lase, but it lases anyway…

Where Those Random Dots in Engravings Come From

Until I hacked the lid switch to its Water Protect input, the power supply had only two digital inputs from the Ruida controller: IN = PWM L = L-ON (low-active) (Plus ground, as discussed below.) This scope shot shows how the PWM signal behaves during the test pattern above at 40% PWM: [Tube Current - 40pct - enable vs PWM - 50 ma-div] The traces: X axis direction = yellow L-ON = Enable = magenta IN = PWM = cyan tube current 50 mA/div = green The upper half of the screen shows two com…

Good luck

[ednisley]

@GonchiGD

engraves random points

Unfortunately, those seem to be unavoidable with the power supplies available to us. Higher-quality commercial-grade machines from reputable manufacturers have better power supplies that behave properly.

You may be able to get a replacement power supply from OMTech under warranty, which may work better. However, it seems the design of the power supplies causes (or at least does not suppress) the random firing problem, so the new supply may behave the same way.

[GonchiGD (Gonzalo Garcia)]

Thank you for your answers, then the only solution will be to agree with OMTech to send a new power supply, which is unlikely to solve the problem.

What does make me angry is that my cheap K40 machine does not have this fault and that a machine of a much higher value with better components does.

Very interesting thread, I will definitely read it in its entirety.

[ednisley]

@GonchiGD

my cheap K40 machine does not have this fault and that a machine of a much higher value with better components does

Perhaps “different” rather than “better” describes the situation.