Lines on engraving - HELP!!

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Skotty58
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Lines on engraving - HELP!!

Postby Skotty58 » Mon Jan 09, 2017 4:36 pm

First of all Id like to ask why I had to reactivate my password in order to log on?


So Im burning some images, some are coming out ok and some well not so much. Im not getting anything near what you are burning as far as image quality.

Settings are at 90IPM, and .01 Rez, max A depth at -.0255

Ive attached the original for comparison...

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Picengravertoo
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Re: Lines on engraving - HELP!!

Postby Picengravertoo » Tue Jan 10, 2017 10:37 am

Our forum has been down because we are working on some updates. I'm not sure why you had to reactivate your password.

A .01 PR is large so it will not give you as fine of detail. You need to focus your laser better. A .005 burn line is what we get when our lasers are focused down to the smallest spot size. We set the PR at .006 and engrave at a 45D angle so the burn lines slightly overlap. Too much overlap will cause the engraving to look blurred.

Skotty58
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Re: Lines on engraving - HELP!!

Postby Skotty58 » Tue Jan 10, 2017 12:50 pm

Thank you. I will make the changes and try again.

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Re: Lines on engraving - HELP!!

Postby Picengravertoo » Tue Jan 10, 2017 1:10 pm

What laser, wattage & lens do you have? Is it a J-Tech laser? If so, there single element does not focus to quite a round circle, so you may have to rotate the module so the rectangular beam is parallel with the engraving angle. Like this.

Capture 45D engraving angle.JPG
Capture 45D engraving angle.JPG (34.89 KiB) Viewed 4804 times


We also found a 3" focal height works best.

Skotty58
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Re: Lines on engraving - HELP!!

Postby Skotty58 » Tue Jan 10, 2017 8:22 pm

Im using a J-Tech laser. Its set at 1.5W and it has the high power adjustable lens. The high is at 3" to the bottom of the heat sink (was unsure about where to exactly set this). I made a 3" Z block to help set up it easier. Ive tried burns at 2W without much change in the image quality.

Theres random streaking in the burned image. I say random but the lines are usually in the same place. I readjusted the Rez to .006 and adjusted the image size. I also started the 45º from the right to see if the streaking would change but it did not. The .006 does make the some of the clarity better but its too dark. Ive burned other images which have no streaking. The attached image I tried at .008. Just to clarify, I open image editor and adjust the image size with a Resolution of .006 (or what ever), save it and then open it in the PEP5, Then change the settings to match the resolution of the image so the gcode step over will be the same as the resolution of the saved image. My laser beam is parallel with the direction of the burn.
Attachments
Screen Shot 2017-01-10 at 8.14.42 PM.jpg
done at .008res 45º right
Screen Shot 2017-01-10 at 8.14.42 PM.jpg (276.22 KiB) Viewed 4798 times

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Picengravertoo
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Re: Lines on engraving - HELP!!

Postby Picengravertoo » Tue Jan 10, 2017 8:56 pm

The streaking could be the DAC loosing position. Do you have the step & dir pulse set to 3 in Motor Tuning? Are you going out of the 8bit 0 to -.0255 depth range?

Skotty58
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Re: Lines on engraving - HELP!!

Postby Skotty58 » Tue Jan 10, 2017 9:35 pm

The depth range is staying within the specified limits. The Step & Dir wasn't set to 3 it was on 5. so that might be it... can't remember why I changed it from 3. DOH! Could it be that simple?

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Re: Lines on engraving - HELP!!

Postby Picengravertoo » Tue Jan 10, 2017 10:16 pm

I did not try 4 or 5. but I know 1 & 2 caused lost steps and the problem went away with a setting of 3.

Skotty58
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Re: Lines on engraving - HELP!!

Postby Skotty58 » Wed Jan 11, 2017 9:25 am

I changed it to 3 and viola no lines. Now to tweak the resolution and feed rate. I went with .008 and a FR of 90 and it was a bit too dark. I bumped it up a little while it was running and it improved somewhat. I'll keep plugging along here.

Thanks for all your help!!!

Scott


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