problems with gray scale

[DarkRabbit19]

dear oni305,

When i was printing with my laser engraver, the gray scale dit not work wel.
but during my test's I got better resolts with different speeds.
Zo i was wondering if jou can change the code to work with speed, instead of total laser Pouwer.
(ore make it a optoin)

I hope to hear from you soon

yours truly,
A maker

[JBSchueler]

Hi DarkRabbit19,

I made some changes to the code a few month ago to at VFR.
Please put these 2 files in the some directory besides the original ones.
Once Inkscape started, you will see a new version in extensions.

Just select Greyscale FRC and set the maximum and minimum feed rate.
max is white, min is black.
Keep in mind this is an experimental version.

EDIT
raster2laser_gcode_new2.zip
this file is missing the laser initiation

USE THE FILE BELOW INSTEAD

[DarkRabbit19]

dear oni305,

When i was printing testet your new code but it dit not work but this is wat i notist:

• At firtst the print dit not start, but it was "printing" when i put a G1 infront of the F**** X*,* lines.
• When it dit print, thare was no gray scale only black.
• Than i was experiminting whit 2 pixel/mm but then the laser turns on (dit not move) and after a wile goes off and auto home's.

I hope this is helpful with your testing.

yours truly,
A maker

(the test files)
https://www.dropbox.com/sh/3fnqt4cns11taqy/AABVDf91-hqlEbPOW9-yTMZka?dl=0

[JBSchueler]

Uhm... you are wright.
I tested at my laser and seems I forgot something.
Keeps me wondering way it was working for me at that time.

Please add the following commands at the top for now.

I will make new version tomorrow...

G28; home all axes
M05
G00 X0.0 Y0.0
G01 F1574 S255
M03

It seems that G01 needs an Fxxx value at the start, it doesn't matter what value it is.
G01 Fxxx S255

The S255 means maximum laser power.
You can lower this value if you want.

JBSchueler_Test.nc.txt

[JBSchueler]

This version has the correction for the laser.
Laser max value will be set at the beginning.
Make sure that Engarving speed and Engarving speed FRC max have the same value.

Keep in mind that white should be a high feed rate. In my case it is around 3200 and dark is 288.
Also the acceleration of X and Yof your CNC laser should be at least double the maximum feed speed.
I use these settings for my 300mW laser.

$110=3200.000
$111=3200.000
$112=3200.000
$120=6400.000
$121=6400.000
$122=6400.000

A also tuned the algorithm a bit to make more contrast for black and white.

The setting I used for Raster 2 Laser are these

This results in a picture like this (during cnc laser)

This is the new version of the code I used.
raster2laser_gcode_new2.zip

[Naruto128]

hello, thank you for your contribution.
You can send me the code for the repetier software. Thank you.

[JBSchueler]

Hi @Naruto128, I am not sure what you main by "repetier software".
The code is available in my previous post [raster2laser_gcode_new2.zip].

[Naruto128]

https://forum.repetier.com/discussion/1387/implementing-laser-intensity

[eckirchn]

I have had zero success with either your published version of the above mentioned version. I realize that does not add much value, but thought I would comment anyway.

[marceloXongonzalez]

????

Traceback (most recent call last):
File "raster2laser_gcode_new2.py", line 37, in
import png
File "/Applications/Inkscape.app/Contents/Resources/share/inkscape/extensions/png.py", line 1885
except ValueError, e:
^
SyntaxError: invalid syntax