r691175002 wrote:The retina is fully capable of grayscale engravings and they have addressed it in the past:
http://www.fullspectrumengineering.com/ ... rt=30#p568
The short version is that nobody does grayscale engraving since materials don't respond as consistently and to your eye there would be no advantage (any form of printed media is dithered). Inkjets use dithering (its not like you can apply a "lighter" dot of colour, the droplet is either there or it isn't) and the visual quality is fine.
r691175002 wrote:You could alternatively use the power supply the way it was designed, namely use the potentiometer to set the maximum current and then provide a 20-50KHz PWM signal through the TTL input as specified in the manual. If you do the math, with a 1ms rise time you can shove a crapload of pulses into the power supply and even a single pulse would be enough since hopefully one would have 8 bit or higher control.
steppenshoe wrote:The difference is easily apparent. I only wish there was an image where both processes worked on the same exact file.
I guess for 3D I have to stick to my router than because I definitely get results like in the non dithered picture using the micro bits and time.
Plus, I would like to see the same carving done with say a DSP verse another system. For me that is what really matters. I would like to get the best a home laser can give now. Going for a system to give the results shown in the better picture is great, but if it is beyond what we currently can do I sure would like to know what is the best out there right now so I can have that while we work to get better.
I assume the best engraving right now is using the DSP with 4 drivers. If any Chinese laser can not give me the results I want with the best system I can make at home I guess than that is the time to go to a different type of laser, correct?
I have a few more questions if someone has time to answer.
Will a larger watt laser using the same motion and laser control system improve the engraving in any way? Will better optics improve the engraving? Will a non Chinese, higher quality power supply improve the engraving? Will the long term laser tube over the cheaper shorter term laser tube improve the engraving in any way?
I would like to start with the best of everything within reason. It seems a lot of work being done is on the laser controller side, but if any of the other items can improve the engraving and are currently available wouldn't it make sense to maybe get those things first?
Thanks for any comments
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