Mirror Laser Engraving 6W LD

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Picengravertoo
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Re: Mirror Laser Engraving 6W LD

Postby Picengravertoo » Wed Jan 11, 2017 3:36 pm

I have used varied intensity on allot of mirrors, but I look for the ones with a even white coating on the back. I found these at Dollar Tree for $1 each, but had to go though a stack of them to find good ones. https://discuss.inventables.com/t/laser ... ry/29990/8

It depends on your image which constant setting to use. Just play with it and see how it looks on the screen. Make sure you start with an image with at least 10DPI resolution, do your resizing/editing, save and then reopen to Dither.

banjags
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Re: Mirror Laser Engraving 6W LD

Postby banjags » Thu Jan 12, 2017 1:38 pm

My images I use 100 pixels/cm. I find i get really good mirror engraves with a pixel resolution of 0.1mm. I know my laser dot is considerably larger then that though (3 times larger maybe). I have tried all the same settings the the dithered image I am running right now. We shall see how it turns out. I used the Sierra algorithm.

Bellybuster
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Re: Mirror Laser Engraving 6W LD

Postby Bellybuster » Thu Jan 12, 2017 1:46 pm

is anyone doing mirrors with a 2.8watt??

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Picengravertoo
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Re: Mirror Laser Engraving 6W LD

Postby Picengravertoo » Thu Jan 12, 2017 6:05 pm

I did this one with a 2W but it took a long time to engrave. It was done on a $1 Dollar Tree mirror.

4896525.jpg
4896525.jpg (153.72 KiB) Viewed 5198 times

Bellybuster
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Re: Mirror Laser Engraving 6W LD

Postby Bellybuster » Fri Jan 13, 2017 12:32 pm

I'm just looking for a starting point for power and speed. Do you still have that info?? Thanks

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Re: Mirror Laser Engraving 6W LD

Postby Picengravertoo » Fri Jan 13, 2017 1:22 pm

I have never tried any mirror engraving with our 2.8W J-Tech laser, but with the 2W, the feedrate was set a 26IPM with a .007 Pixel Resolution. That Angel engraving was 10" X 8" and it took 7 hours 20 minutes to complete. :o

You will have to experiment with the settings when engraving mirrors because the back coating from different manufacturers burns easier then others. Make sure you flip (mirror) the image first and reverse the min/max power settings in PicLaser. More laser power burns white on the front and less power looks black (reflective).

banjags
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Re: Mirror Laser Engraving 6W LD

Postby banjags » Fri Jan 13, 2017 2:04 pm

I had 3 watt from DTR. It worked pretty good on the mirrors I had. I engraved 0-255 power at 900-1200 mm/min. 0.1mm pixel res.

Those speeds dont surprise me much. I am running a 12"x12" mirror right now has been running for 16 hours so far...

So to further my last post. Tried dithering with Sierra... that was a fail. Did not look anything like what was on the screen.

Could post a sample of what your dithered images look like before you enter them into PEP5. Maybe I am not adjusting the levels properly cuz I cannot attain the level of detail your ship or the angel have.

Maybe I need to try Atkinson algorithm
Last edited by banjags on Fri Jan 13, 2017 4:43 pm, edited 1 time in total.

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Re: Mirror Laser Engraving 6W LD

Postby Picengravertoo » Fri Jan 13, 2017 2:43 pm

The ship engraving was from a dithered black & white image (laser pulsed on/off), but the Angel was laser engraved with varied intensity from a grayscale image.

Here is the original grayscale image of the ship.

Cairnbulg_(ship,_1874)mirror1.jpg
Cairnbulg_(ship,_1874)mirror1.jpg (254.85 KiB) Viewed 5138 times


Here it is after Dithering the image with Atkinson.

Cairnbulg_(ship,_1874)mirror1 dithered.jpg
Cairnbulg_(ship,_1874)mirror1 dithered.jpg (322.5 KiB) Viewed 5138 times

banjags
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Re: Mirror Laser Engraving 6W LD

Postby banjags » Fri Jan 13, 2017 4:46 pm

So i think the key is to using images with not a lot of mid grey colours. Seem to lose a lot of the mid range shades.

I think I need to darken the darks more. This image does not seem to have any white in it at all... Maybe also darken my whites. Sounds like doing laundry LOL

That makes that image of the angel that much more impressive looking.

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Re: Mirror Laser Engraving 6W LD

Postby Picengravertoo » Fri Jan 13, 2017 5:12 pm

I have not run across any image that does not need editing. Most just require some gamma adjustment and sharpening. Editing an image is hard to teach someone because perfection is always in the eye of the beholder.

Also, the Dithered ship image I posted was saved as a jpg, so it has grays when viewing it here. When the editor saves a Dithered image, it saves in 1bit B&W bmp format, but our forum does not let you download any bmp image files.


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