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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.
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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.


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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?

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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 -
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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)?
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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.

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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 »
Quote from: wild.bill on January 27, 2018, 06:06:00 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?
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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.
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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 »
Quote from: wild.bill on January 27, 2018, 10:05:33 AM
Attached are the before, after, and Photoshop screen showing the curve used.
Excellent, thanks for sharing your work.
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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.
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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
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