Photo Realistic Engravings Shades of Grey

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Photo Realistic Engravings Shades of Grey

Postby JJWMACHINECO » Fri May 03, 2013 9:17 pm

I have come a long way since last posting my diode laser engravings here. PVC settings shown in screenshots. I varied the power with analog modulation to get 8-bit shades of grey on Birch Plywood.

Jeff
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PVC1.jpg
Screenshot1
PVC2.jpg
Screenshot2
PVC3.jpg
Laser Engraving
Extensivly Re-worked/Re-designed/Modified Servo K2CNC KG-3925 and the Mini Laser Engraver
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Re: Photo Realistic Engravings Shades of Grey

Postby citrusguy » Fri May 03, 2013 9:58 pm

Excellente, mi amigo. :D
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Re: Photo Realistic Engravings Shades of Grey

Postby Ms Wolffie » Fri May 03, 2013 10:59 pm

WOWIE
Makes me want a laser engraver :P
Cheers
Wolffie
Cheers
Wolffie

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Re: Photo Realistic Engravings Shades of Grey

Postby JJWMACHINECO » Fri May 03, 2013 11:24 pm

Wolffie wrote:WOWIE
Makes me want a laser engraver :P
Cheers
Wolffie


Is that ignorance or jealousy?? :P
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Re: Photo Realistic Engravings Shades of Grey

Postby Ms Wolffie » Sat May 04, 2013 12:15 am

ENVY :lol:
I have never been able to work out PVC.
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Wolffie
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Re: Photo Realistic Engravings Shades of Grey

Postby JJWMACHINECO » Sat May 04, 2013 11:59 am

Thanks John. :wink:

Wolffie, I apologize If I interpreted your comment incorrectly.

I have been using another program that has enhancements for laser diode engraving for quite some time now, but will not name it here. PVC is capable of producing the g-code for laser engraving with the correct control means and there are different ways to do it. I have a 1W 445nm laser diode and use a MA3 US Digital analog shaft encoder tied to my Z axis stepper motor by timing belts to control the modulation to the laser. I have been running this setup for over 800 hours now with no failures.

I explain in more detail how I set this up on my router in this thread. viewtopic.php?f=16&t=15161

Dave came up with another way to control the modulation using the step and direction pins from Mach and his circuit is referenced in his thread.
viewtopic.php?f=16&t=15339

Now there is a third way that Dave discovered after I referenced another Maxim Digital Potentiometer chip. This Digital Potentiometer he found can take the step and direction from Mach and give the 256 steps needed to vary the power to the laser to get the 8-bit shades of grey.

http://www.datasheetcatalog.org/datashe ... AX5455.pdf

I have done some testing with the max5451 with successful results, but still prefer the encoder because it has 10-bit resolution. Besides, it's not easy to solder the pins on a TSSOP surface mount chip. :roll:

Jeff
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Re: Photo Realistic Engravings Shades of Grey

Postby JJWMACHINECO » Tue May 14, 2013 8:30 pm

Did this laser engraving today for a good friend of mine. :wink:
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einstein.jpg
Imagination
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Re: Photo Realistic Engravings Shades of Grey

Postby calgrdnr » Tue May 14, 2013 8:43 pm

That is so cool thanks for sharing :)
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Re: Photo Realistic Engravings Shades of Grey

Postby JJWMACHINECO » Wed May 15, 2013 11:41 am

Thanks Kent. :D
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