Setting up picLaser and j Tech DAC PWM

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cstmwrks
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Re: Setting up picLaser and j Tech DAC PWM

Postby cstmwrks » Wed Dec 07, 2016 3:52 pm

Just made a new photo image. WOW! It looks good!

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Picengraver
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Re: Setting up picLaser and j Tech DAC PWM

Postby Picengraver » Wed Dec 07, 2016 5:52 pm

Congratulations.
Pictures?

Skotty58
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Re: Setting up picLaser and j Tech DAC PWM

Postby Skotty58 » Wed Dec 07, 2016 10:16 pm

Can the Z axis be used in place of the A axis as mentioned above? In my setup I have 2 motors on the Y axis one is driven by the A axis slaved to the Y.
So my Z stepper motor is disabled at the moment.

Maybe I need to reconfigure this setup?

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Picengravertoo
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Re: Setting up picLaser and j Tech DAC PWM

Postby Picengravertoo » Thu Dec 08, 2016 3:45 am

Yes, the Z axis can be used, but wouldn't you want to use the Z axis for setting the laser's focal height from your material? I would set the B or C axis as the Y axis slave and use the A axis for the laser. Just a thought.

Skotty58
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Re: Setting up picLaser and j Tech DAC PWM

Postby Skotty58 » Thu Dec 08, 2016 8:27 am

I can manually move the Z axis.

So does the Z axis need to move when doing these engravings? I was under the impression that it stayed locked at a certain focal height?

I guess I can just change the pin settings in Mach3 config, thats easy to do, then I could use the A axis as suggested.

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Picengravertoo
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Re: Setting up picLaser and j Tech DAC PWM

Postby Picengravertoo » Thu Dec 08, 2016 8:54 am

The focal distance is critical to maintain, so setting Z at a consistent precise distance every time sure helps. However, you could make a wooden gauge block and focus your laser based on that height (3"?). Then you set the gauge block down on your material and then move the Z down to it so that distance is consistent every time. Whatever works best for you and your setup.

cstmwrks
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Re: Setting up picLaser and j Tech DAC PWM

Postby cstmwrks » Thu Dec 08, 2016 10:45 am

so I just did another image test and the result leads to yet another set up question. If A was connected to a motor there is a MACH 3 check box some place for motor direction. Reason I ask is the latest test was a negative image. black parts are white and white parts are black. So changing motor direction would in effect reverse the signal so dark will be dark and so on?
****** Just got off the phone with Jay at J Tech, anyhow it was solved. Changed the output direction in MACH3 and reset my jog keys. Am burning a new image now.

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Picengravertoo
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Re: Setting up picLaser and j Tech DAC PWM

Postby Picengravertoo » Thu Dec 08, 2016 11:09 am

You have to change the Dir LowActive for the A axis in Ports & Pins, Motor Outputs. If it's checked, uncheck it. If it's unchecked, check it. This will effect the jogging directions too, so you need to change the A axis jogging keyboard shortcuts again.

cstmwrks
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Re: Setting up picLaser and j Tech DAC PWM

Postby cstmwrks » Thu Dec 08, 2016 12:08 pm

Picengraver wrote:Congratulations.
Pictures?


This was the test image:
imagessub.jpg
imagessub.jpg (5.47 KiB) Viewed 7465 times

on the left is the photo version. On the right I increased brightness, dithered then burned:

subTest.jpg
subTest.jpg (36.77 KiB) Viewed 7465 times


Came out way dark but that may be from me not prepping the image right.

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Picengravertoo
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Re: Setting up picLaser and j Tech DAC PWM

Postby Picengravertoo » Thu Dec 08, 2016 12:18 pm

There is not allot of shades/contrast in the original image, so the results may not be as desirable. If you want to engrave B&W, use the Atkinson Dithering Algorithm. It's adjustable. Anyway, your on the right path.


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