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Still getting noise/dots

I previously thought thought this was due to a dirty image. I recreated the image and created new vector images and am still getting dots during raster or vector engravings. I've switch USB cables, installed a cap and resistor, tried images from Photoshop and Inkscape, BMP, SVG, and JPeg. Same result. Last ditch effort before I switch back to the stock board. Help is greatly appreciated.

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  • 20190121_191555.jpg

The problem is with the $28 setting . The default setting of 0 is giving me this problem. 5 and 6 do not produce this problem. Any ideas?

 

Indeed you can set a different frequency for the PWM. Higher frequencies do work but have less grey shading capablities. Alternatively you could use the dither engraving on your laser software (laserweb or LightBurn) and see if that gives you better results.

In terms of random dots, I speculate some electrical noise could be there. Adding a 100nF capacitor in parallel over the 5V or PWM and ground terminals could be enough to suppress those spikes. These capacitors cost only a few cents and if you can't find them, I can post them in a mailing envelope to you.

You could try to re-organise some wires by moving them slightly apart to see if that reduces cross talk.

 

cheers!

Cheers, Paul awesome.tech

I suspect the same. I would like to be able to use the full range of frequencies. I did put a resistor and cap on the 5v line didn't seem to make a difference. I am currently running all new shielded wires and new connectors. I made sure when I started having the problem that none of the wires were crossing over one another and spread out.  Fingers crossed.

@bad-luck-leather,

Did you ever get this issue sorted with the random black spots? I have tried everything I can think of to get rid of them, but nothing works. Again, like you, $28 set at 5 or 6 works, but the resulting engraving looks so bad, it's not worth doing.

It's definitely something to do with the Gerbil, as the original M2 Nano board does not do it at all.

Quote from FillDeeUK on August 28, 2019, 1:12 am

@bad-luck-leather,

Did you ever get this issue sorted with the random black spots? I have tried everything I can think of to get rid of them, but nothing works. Again, like you, $28 set at 5 or 6 works, but the resulting engraving looks so bad, it's not worth doing.

It's definitely something to do with the Gerbil, as the original M2 Nano board does not do it at all.

Yes I believe so. I believe it had to do with the k40 not being properly grounded. After further inspection the grounding post on my K40 was completely insulated from the frame... Why I do not know. They had to put extra work and materials to do it.

So I removed the insulating spacer, ground off the the paint and re attached the ground . I also replaced all the wiring that was ran together with twisted pair just to be sure I wasn't getting any extra noise.

 

Hmm, it all looks ok to me, no insulating washer on mine, but I'll give it a go and make sure it's all got good connections.

 

Thanks for your quick response.

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