PEP6 - advice requested

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bryanmaple
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Joined: Sun Dec 25, 2016 9:20 pm

PEP6 - advice requested

Postby bryanmaple » Tue Sep 12, 2017 12:05 pm

Hi Everyone,

So I finally have my laser up and operational once again, and I just upgraded to PEP6 from PicLaser. I like the features of PEP6, but the primary reason I upgraded was because of the fact that it makes working with my delta printer much easier, since PEP6 has the option of 0,0 being center.

I'm doing a test run using a picture of my niece, but not getting very good results. I've attached pictures so you can see what I'm dealing with.

Basic info - J-Tech 2.8 laser. Using pixel resolution of .1524. Distance between laser and surface, 76mm

oph2.jpg is the picture I'm trying to burn.

Pic1 is the result at a feed rate of 500. Obviously too slow

Pic2 is the result at a feed rate of 850. Better, but still not very good.

Pic 3 is the result at a feed rate of 1100.

I'm hoping to get some feedback and advice on what I can do to help improve the results.

Please let me know if you need more details.

Thanks for any and all help!

B.

oph2.jpg
oph2.jpg (183.78 KiB) Viewed 6958 times

Pic1_FR500.jpg
Pic1_FR500.jpg (124.19 KiB) Viewed 6958 times

Pic2_FR850.jpg
Pic2_FR850.jpg (169.56 KiB) Viewed 6958 times

bryanmaple
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Joined: Sun Dec 25, 2016 9:20 pm

Re: PEP6 - advice requested

Postby bryanmaple » Tue Sep 12, 2017 12:06 pm

Pic3_FR1100.jpg
Pic3_FR1100.jpg (137.74 KiB) Viewed 6956 times


Wouldn't let me attach the 4th pic to original post.

B.

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Picengravertoo
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Re: PEP6 - advice requested

Postby Picengravertoo » Wed Sep 13, 2017 9:13 am

Hi Bryan,

I assume you went through the focusing procedure I posted here.

viewtopic.php?f=7&t=287

Your second pic engraving looks OK, but it does look like the laser's burn lines may be overlapping instead of laying down next to each other and causing a slight blur. You may need to secure the lens with a few dabs of hot melt glue between the lens thread and the heat sink/laser module too.

Also we sand the wood across the grains with fine sandpaper before lasering the Image. Have you tried using varible laser power with a color or grayscale image instead of pulsing the laser on/off with a 1bit Dithered image?

If you prefer using a Dithered image, don't use the Gray Scale Curve in PEP6 as it will add grays back into it and the gcode will not have just two power levels.

Jeff

bryanmaple
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Joined: Sun Dec 25, 2016 9:20 pm

Re: PEP6 - advice requested

Postby bryanmaple » Fri Sep 15, 2017 11:20 am

HI Jeff,

Yes, I did follow the focusing procedure and have the laser aligned as you suggested. I'm still getting very poor results as you can see by the pics attached to this post.

Would you be able to process a picture for me based upon what you think it should be and send me the gcode file and then I could print it and see how it turns out. That would narrow it down to whether it is a software issue, meaning that I don't have something set up properly in PEP, or if it is some kind of hardware issue that I need to look at.

Here are the latest results.

oph_a2.jpg
oph_a2.jpg (94.09 KiB) Viewed 6937 times

oph_a1.jpg
oph_a1.jpg (62.11 KiB) Viewed 6937 times


Here is one of the pics I've been trying to convert

IMG_0879.JPG
IMG_0879.JPG (121.48 KiB) Viewed 6937 times


Any thoughts or suggestions?

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Re: PEP6 - advice requested

Postby Picengravertoo » Fri Sep 15, 2017 12:26 pm

Does your Delta 3D printer controller's firmware execute the M106 S commands in real time? I assume you're using the 3D laser Engraving Profile in PEP6 to generate the gcode, correct?

bryanmaple
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Joined: Sun Dec 25, 2016 9:20 pm

Re: PEP6 - advice requested

Postby bryanmaple » Fri Sep 15, 2017 5:24 pm

Yes, as far as I know it is real time. How would I check that?

Yes, I'm using the 3d laser profile for JTech.

Here are my settings

pep6.jpg
pep6.jpg (455.91 KiB) Viewed 6932 times

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Picengravertoo
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Re: PEP6 - advice requested

Postby Picengravertoo » Fri Sep 15, 2017 6:36 pm

1250mm/min seems slow for the 2.8W J-Tech laser, but it does depend on the material you are engraving on. We were running at 2300mm/min on Poplar or Birch Ply with our 2.8w J-Tech. If you speed it up, you may need to raise the min laser value so the lightest shades will still burn slightly. This is with a color or Gray Scale image.

With a Dithered image, the min value needs to be zero so the laser power is none.

Unselect Extended Edge. 3D printer controllers use the ; for the Start and End Comments from what I understand.


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