Author Topic: 8-bit gray  (Read 2239 times)

QuietMike

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8-bit gray
« on: April 16, 2016, 09:22:22 AM »
Hi, I have ordered a 2.5w laser cnc, I don't have it yet but it's one of those Chinese ones that use the eleks maker stuff and come with Benbox. I have another program called 3dp-burner that shows it will do 8-bit greys which is what I what I am after,


Does the Benbox software burn grays?
Actually  I guess my question is more about how the laser creates different shades, I could see it going one of two ways, either where the laser scans over a line at a constant speed and pulses the laser at different powers.
Or where the laser power remains constant and the scan speed is changed to create less or more time over any given pixel

Which is a better method and how do I get my machine to do it?


 Like I said I haven't even gotten started yet so I'm sorry if these questions are basic
« Last Edit: April 16, 2016, 10:35:52 AM by QuietMike »

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Re: 8-bit gray
« Reply #1 on: April 16, 2016, 11:17:02 AM »
Welcome...!!!
Admin -- Ralph -- support @ BenCutLaser dot us
https://www.dropbox.com/s/qv1qee2vb65785t/SetupBenCutLaser3.2a.zip?dl=0
BCL Paid license: $49.95
via Paypal to bclpp@primemail.com

QuietMike

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Re: 8-bit gray
« Reply #2 on: April 17, 2016, 07:27:30 PM »
it looks like if you flash with Grbl, or the custom grbl for 3dpburner software, you can get PWM control of the laser.
has anyone used 3dpburner with these eleks maker/arudrino engravers?

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Re: 8-bit gray
« Reply #3 on: April 17, 2016, 07:30:28 PM »
I have not...
Admin -- Ralph -- support @ BenCutLaser dot us
https://www.dropbox.com/s/qv1qee2vb65785t/SetupBenCutLaser3.2a.zip?dl=0
BCL Paid license: $49.95
via Paypal to bclpp@primemail.com

BritVic

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Re: 8-bit gray
« Reply #4 on: April 18, 2016, 01:03:32 AM »
Thanks for the heads up re 3DP- Burner Mike
I have downloaded all the files on offer at their site
Seems to be quite old though, strangely!
I will have a play later, and then report back
Vic

ROSS

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Re: 8-bit gray
« Reply #5 on: April 18, 2016, 01:39:44 AM »

I will have a play later, and then report back
Vic

Another interesting set up.  Look forward to  your testing results........
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Lasers are wonderful machines..not ONLY  can they cut a finger off BUT  they can also cauterise it at the same time.....

SAFETY -  IS NO ACCIDENT

caperry88

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Re: 8-bit gray
« Reply #6 on: April 18, 2016, 03:23:45 AM »
Definitely interested in results, please post when you get them, and Welcome!!
Equipment:  Gearbest 2500mw A5 Mini Laser Engraving Machine  -  2500MW  SILVER 167912906 Air-cooling Weak Light Automatic Positioning DIY Kit
Software: T2Laser with J-Tech Photonics 0.9g Grbl

BritVic

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Re: 8-bit gray
« Reply #7 on: April 18, 2016, 06:22:16 AM »
Well I was burning to know what it looked like, so here is where I got the 3 files I needed http://3dpburner.blogspot.co.uk/p/files.html
I flashed their firmware to my Arduino using Xloader. Installed the sender, and whilst I was there installed the picture to code utility
Everything looks great, and on initial test seems to work , But.... you do need to have the link under the Arduino set to grbl .9 or else the laser stays permanently on (ask me how I know )
However.... I also found that injudiciously clicking buttons like "Home" caused the scanner to mechanically crash into the end stops. I decided at that point to discontinue playing until I had installed limit switches. So that is my next project in line. Over to you guys, at least you know the software works, and looks like it might have potential!
Almost forgot to mention... yes, the laser power setting does actually work.
This piece of software seems to be very intuitive to use.
Vic
« Last Edit: April 18, 2016, 06:39:02 AM by BritVic »

ROSS

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Re: 8-bit gray
« Reply #8 on: April 18, 2016, 07:52:01 AM »
Thanks for that Vic......Setting the "HOME"  in the software might obviate switches.....
I will have a look at the software eventually.
I will buy some sponge for a soft bump when it goes haywire!!!
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Lasers are wonderful machines..not ONLY  can they cut a finger off BUT  they can also cauterise it at the same time.....

SAFETY -  IS NO ACCIDENT

BritVic

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Re: 8-bit gray
« Reply #9 on: April 18, 2016, 10:13:22 AM »
Spoken like a true engineer lol @ " some sponge for a soft bump " :)

ROSS

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Re: 8-bit gray
« Reply #10 on: April 18, 2016, 12:06:53 PM »
Having spent 30 yrs in aviation   I have  it that any accident you walk away from is a good landing!!
.
Lasers are wonderful machines..not ONLY  can they cut a finger off BUT  they can also cauterise it at the same time.....

SAFETY -  IS NO ACCIDENT