Author Topic: Grayscale with K40  (Read 3224 times)

wild.bill

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Grayscale with K40
« on: January 23, 2018, 12:47:19 PM »
It's been way to quiet so I figured I would show this grayscale image I just etched on Birch using the K40. I did photoshop - curves to get a more linear result.
Laser: was an A3 2.0w TTL L6/GRBL Z axis now 2'x3'
          OpenBuilds ACRO 510 w/ 2.0W TTL laser Cohesion Mini/Smoothie Z axis Homing switches
          K40 Cohesion Mini 60W LightObject LPS
          80W CO2 Red-Black 500x700

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ggallant571

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Re: Grayscale with K40
« Reply #1 on: January 23, 2018, 02:05:11 PM »
I noticed that the pixel at (85,73) is slightly off color. Please correct and resubmit.
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wild.bill

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Re: Grayscale with K40
« Reply #2 on: January 23, 2018, 02:11:17 PM »
Actually I have another print now that i think is coming out even better. I will make sure that pixel is corrected as well.


Laser: was an A3 2.0w TTL L6/GRBL Z axis now 2'x3'
          OpenBuilds ACRO 510 w/ 2.0W TTL laser Cohesion Mini/Smoothie Z axis Homing switches
          K40 Cohesion Mini 60W LightObject LPS
          80W CO2 Red-Black 500x700

cool is simply a subjective state of mind

wild.bill

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Re: Grayscale with K40
« Reply #3 on: January 26, 2018, 08:55:02 PM »
I started having a problem with an X shift tonight with the K40 - that I will have to fix. Here is the latest grayscale that does have a shift in it. I wounder if there is a message in this image?

Laser: was an A3 2.0w TTL L6/GRBL Z axis now 2'x3'
          OpenBuilds ACRO 510 w/ 2.0W TTL laser Cohesion Mini/Smoothie Z axis Homing switches
          K40 Cohesion Mini 60W LightObject LPS
          80W CO2 Red-Black 500x700

cool is simply a subjective state of mind

ggallant571

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Re: Grayscale with K40
« Reply #4 on: January 26, 2018, 09:38:42 PM »
Thy true self is emerging.
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wild.bill

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Re: Grayscale with K40
« Reply #5 on: January 26, 2018, 09:53:30 PM »
Yup -
Laser: was an A3 2.0w TTL L6/GRBL Z axis now 2'x3'
          OpenBuilds ACRO 510 w/ 2.0W TTL laser Cohesion Mini/Smoothie Z axis Homing switches
          K40 Cohesion Mini 60W LightObject LPS
          80W CO2 Red-Black 500x700

cool is simply a subjective state of mind

Zax

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Re: Grayscale with K40
« Reply #6 on: January 27, 2018, 05:00:40 AM »
How are you doing the grey scale? Is your laser TTL or do you use velocity mode (or something similar)?

wild.bill

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Re: Grayscale with K40
« Reply #7 on: January 27, 2018, 06:06:00 AM »
It is on the K40 with a Cohesion Mini board/ Smoothie using grayscale. I need to also add that I am applying a Photoshop curve to make up for the non-linear laser.

The "L" signal which drives the laser is PWM. Still learning the details of the
board but I "think" its being driven via a FET pulling the signal to ground.
It's NOT TTL but is used with a PWM signal the same way.

It's a big learning curve with Smoothie - much like when I was learning the Arduino/GRBL
controllers. I am digging fast and deep because my next Cohesion Mini should be here soon
thats going on the ACRO system - and it looks like I will have to write the first guild for doing it.

Laser: was an A3 2.0w TTL L6/GRBL Z axis now 2'x3'
          OpenBuilds ACRO 510 w/ 2.0W TTL laser Cohesion Mini/Smoothie Z axis Homing switches
          K40 Cohesion Mini 60W LightObject LPS
          80W CO2 Red-Black 500x700

cool is simply a subjective state of mind

carolynsdad

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Re: Grayscale with K40
« Reply #8 on: January 27, 2018, 08:53:49 AM »
I need to also add that I am applying a Photoshop curve to make up for the non-linear laser.

I wonder if you would please send up copies of your original and processed image files so we can see the nature of the curve you apply?
2.5W BangGood laser kit in use by my daughter for craft work.
3.5W BangGood with TTL board in use by me as a developemt tool only.
T2Laser and Benbox software.

wild.bill

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Re: Grayscale with K40
« Reply #9 on: January 27, 2018, 10:05:33 AM »
Attached are the before, after, and Photoshop screen showing the curve used.
Laser: was an A3 2.0w TTL L6/GRBL Z axis now 2'x3'
          OpenBuilds ACRO 510 w/ 2.0W TTL laser Cohesion Mini/Smoothie Z axis Homing switches
          K40 Cohesion Mini 60W LightObject LPS
          80W CO2 Red-Black 500x700

cool is simply a subjective state of mind

carolynsdad

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Re: Grayscale with K40
« Reply #10 on: January 27, 2018, 02:13:22 PM »
Attached are the before, after, and Photoshop screen showing the curve used.
Excellent, thanks for sharing your work.
2.5W BangGood laser kit in use by my daughter for craft work.
3.5W BangGood with TTL board in use by me as a developemt tool only.
T2Laser and Benbox software.

ggallant571

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Re: Grayscale with K40
« Reply #11 on: January 27, 2018, 09:07:43 PM »
What is the finished size supposed to be? I burned the first image on 2.5W  machine at approx 1000mm/min and power of 120 on bass wood. The area is 34mm x 48mm and the detail is not great. Trying again at a faster rate (1200) to see if a lighter burn looks better. Should it be scaled larger?
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wild.bill

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Re: Grayscale with K40
« Reply #12 on: January 27, 2018, 09:16:15 PM »
The birch that I am using is cut into 6"x6" pieces.
What you don't see is the huge stack of wood that got dumped before I started getting good images.
LOTS of trial and error.
Laser: was an A3 2.0w TTL L6/GRBL Z axis now 2'x3'
          OpenBuilds ACRO 510 w/ 2.0W TTL laser Cohesion Mini/Smoothie Z axis Homing switches
          K40 Cohesion Mini 60W LightObject LPS
          80W CO2 Red-Black 500x700

cool is simply a subjective state of mind