Black will not cut on my Chinese 80 watt

LightBurn Software Questions
1

I had a problem over the weekend that I sort of solved (found a workaround).

I drew a circle in Aspire, cut it in half, and closed all four ends with a straight line so that I had 4 semi circles.

I saved this as a DXF and imported it into LB v1.4.01.

Here I rearranged the parts so that I saved plastic wastage.

I then made three of the parts a different layer and tried to cut the black layer.

The head moved around and did all the correct things, but did not cut.

My immediate thoughts were BUJJER. Either a blown PSU or tube.

I tested both for the next hour and got nowhere.

I then changed the layer from black to pink … and it all worked properly.

??? WHY

I attach the program for your consideration and - hopefully - an explanation

4 semi circles.lbrn2 (21.8 KB)

2

The file you uploaded has everything on C00 and behaves properly, so it’s difficult to tell where the problem might be.

If you had Cut selected graphics turned on and didn’t select the object, that would do it, although the prompt should have been obvious.

If parts in the “pink” layer were selected, but the layer output was turned off, that would do it, too.

In situations like this, it’s almost always a simple and easily corrected operator malfunction. Been there, done that. Repeatedly! :grin:

3

One other thing to look at. Min power is 5%. With power scaling it’s possible that your tube is unable to fire at the requested power level. Try increasing min power.

4

When you change the color of the layer, it will pick up the default settings of the new layer… That is probably what happened…

I assume this is the Ruida?

:smile_cat:

5

I believe the minimum power was set at 85%. Could be wrong, memory fades quickly nowadays. :slight_smile:

6

Yes, it is the Ruida. I don’t believe that resetting the colour should have stopped the black working in the beginning though.
I didn’t try setting it back to black.

7

I was directly referencing the settings from the file that you uploaded. In that file I can see that the setting for Minimum power is indeed 5%. If your expectation was that it was 85% percent then that could very well be the issue causing the symptoms that you saw.

8

OK, thanks, I will check that out a bit later and let you know.

9

Hello berainlb

You were correct. The setting of 5% power as a minimum would not allow the laser to turn on. It did not turn on until I set it at 10% minimum.

Why is this so?

I would have thought that a very small minimum would just not allow the laser to fire when that minimum was actually called.

Anyway, thank you very much for clearing up that problem for me. I will know to look for it in the future should a similar thing occur.

10

Fantastic. Glad that was it.

You’re making the assumption that it’s not actually being called for. There’s an algorithm in the controller that modulates power based on actual speed of the laser head. Since the motion is not instantaneous it takes time for the laser head to both speed-up and slow-down. The Max power will be used only when you’re reaching the requested speed in your settings. At all other times, and especially at corners or other drastic changes in direction, power will need to be reduced to accommodate the deceleration. It seems in this case to the point where it shut off.

11

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