Author Topic: Slate problem  (Read 909 times)

ggallant571

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Slate problem
« on: January 13, 2018, 02:14:29 PM »
I just tried to etch a slate coaster with 2.5W laser and the result was very faint. Not sure that my speeds are accurate but used 900 mm/min at full power. Running a second  pass to see if it improves. The image has lots of lines that are 3 pixels wide in all directions. Etched ok on test cardboard and the final product will be on a mirror. Any thoughts?
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ThothLoki

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Re: Slate problem
« Reply #1 on: January 13, 2018, 05:36:32 PM »
2 thoughts

1. some slate just doesnt etch as well. I have has some that were very faint no matter the speed

2. what is the ambient temperature? I have noticed that slate etches bad when cold.
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ggallant571

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Re: Slate problem
« Reply #2 on: January 13, 2018, 07:17:57 PM »
The slate in in a heated basement. Probably 65F. I think the image is just not a good etching candidate. Attached for your viewing pleasure or prove me wrong. BTW - It is PCB artwork. I did not make the original.

I aslo etched in mirror and wood. The mirror looks great at an angle but crappy when dead on. The wood came out the best. The 2.5W laser is burning very crisp 3 pixel lines spaced at similar distances.
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ThothLoki

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Re: Slate problem
« Reply #3 on: January 13, 2018, 11:28:09 PM »
The lines are thin. A 2.5w will not be good for this on slate. I had an image with fine lines like that and it was all blurry. I threw my old 2w on it (probably more like a 1.6w) and it came out great.

If you can, try a less powerful laser with a smaller dot
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ggallant571

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Re: Slate problem
« Reply #4 on: January 14, 2018, 05:34:39 AM »
What settings?
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ThothLoki

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Re: Slate problem
« Reply #5 on: January 14, 2018, 08:10:27 AM »
Full power at .2

My old 2w is a 2 wire
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ggallant571

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Re: Slate problem
« Reply #6 on: January 14, 2018, 09:17:23 AM »
.2 what?
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ThothLoki

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Re: Slate problem
« Reply #7 on: January 14, 2018, 10:07:26 AM »
sorry. resolution
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ggallant571

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Re: Slate problem
« Reply #8 on: January 14, 2018, 10:22:21 AM »
OK. I used 0.1. What speed?
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ThothLoki

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Re: Slate problem
« Reply #9 on: January 14, 2018, 01:02:20 PM »
Now you are stretching my memory
I think 500-800 for my 2w
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kibodwin

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Re: Slate problem
« Reply #10 on: January 15, 2018, 01:32:26 AM »
I have to agree with ThothLoki as I have found that there is a lot of variety in slate. Some is machine finished whist others have some sort of varnish... and I have even found some that have the slate effect painted on them...
On the really weird ones I just grind the top layer off with a grinder or sandpaper... results depend on the underlining slate...
=)
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ggallant571

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Re: Slate problem
« Reply #11 on: January 15, 2018, 03:42:08 AM »
@Thothloki - I am curious about the 0.2 spacing. Many of the lines are 3 pixels wide which is 0.3mm. Did you get every other line?
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ThothLoki

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Re: Slate problem
« Reply #12 on: January 15, 2018, 04:31:37 AM »
Well, I did. It try your image. I was talking about an image I had don before and got similar results to you. I do not know the pixels of that image. I will dig into my pictures and see if I still have them to show you
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ggallant571

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Re: Slate problem
« Reply #13 on: January 15, 2018, 04:59:33 AM »
Thanks. I had been using a 5.5W laser for slate and it would not do anything as small as 0.3mm resolution. Just blasted out big chunks (0.5mm). It has died and I am still learning what the lower power lasers are capable of. So far mirrors and wood appear better, slate worse.
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