Can a CNC router remove paint in layers on wood signs? - Router Forums
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post #1 of 15 (permalink) Old 08-06-2019, 01:11 AM Thread Starter
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Default Can a CNC router remove paint in layers on wood signs?

Hello, I'm VERY new to CNC routing. I do not have a machine of my own yet as I am trying to get as much info about them as I can before I decide to buy one. Right now I have a vinyl cutter and like to make painted wood signs with words and designs on them. Usually I'll paint the entire sign with whatever color I want the words and/or design to be, then I'll lay the vinyl design onto that and paint what color I want the sign to be after this. Once this is done I just remove the vinyl and have my sign all finished. However, this can take some time and sometimes ends up a little sloppy.

Now lets say I paint a piece of wood black and then paint white on top of that. Would a CNC router be capable of removing the top layer of white and reveal the black or would it just remove both layers of paint? I'm just trying to find a quicker way of making these and the fancier looking fonts can sometimes be a pain to use with vinyl.

Last edited by kwickett85; 08-06-2019 at 01:17 AM.
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post #2 of 15 (permalink) Old 08-06-2019, 03:30 AM
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Maybe you are saying right
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post #3 of 15 (permalink) Old 08-06-2019, 06:46 AM
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Would a CNC router be capable of removing the top layer of white and reveal the black or would it just remove both layers of paint?
Technically, yes, but in reality, no.

1) The paint would need to be really thick to not cut through the second layer.
2) Your boards would need to be perfectly flat, and uniform in thickness to within about .001". This is the main problem, as it would be almost impossible to pull this off. Just putting paint on the wood may cause it's thickness to change, due to moisture in the paint.

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Last edited by difalkner; 08-06-2019 at 08:40 AM.
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post #4 of 15 (permalink) Old 08-06-2019, 06:47 AM
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Would a CNC router be capable of removing the top layer of white and reveal the black or would it just remove both layers of paint?
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post #5 of 15 (permalink) Old 08-06-2019, 08:36 AM
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post #6 of 15 (permalink) Old 08-06-2019, 08:46 AM
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Originally Posted by kwickett85 View Post
Hello, I'm VERY new to CNC routing.
Welcome to the forum! Add your first name to your profile to clear the N/a in the side panel and so we'll know what to call you.

I agree with Gerry in that this would work in a perfect setting but you're not likely to have that in reality. But, having said that, if I had that same scenario and needed the same result I wouldn't hesitate to try it at least once on the CNC. However, I wouldn't buy a CNC just to try this little experiment. If you're getting one anyway then be sure to post photos of your test whether it passes or fails.

Good luck with it!

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post #7 of 15 (permalink) Old 08-06-2019, 09:09 AM
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Welcome to the forum,
I have never tried it on the CNC but don't think it would work for the reasons stated above. I have done something like that with the laser, just have to get the right settings.
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post #8 of 15 (permalink) Old 08-06-2019, 09:43 AM Thread Starter
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Welcome to the forum! Add your first name to your profile to clear the N/a in the side panel and so we'll know what to call you.
Just changed it.

Okay, so would it be better to remove everything except for the wording then? Instead of my first post where I was asking if I could remove a layer of paint where the wording is and leave the rest of the sign untouched I'd be doing the opposite and just leaving the area where the wording is untouched. Like you guys have said it would depend on how the wood is, but I would be able to adjust how deep it goes, correct? I just want it to be as flat as possible without having too much of a 3D look. I plan on doing more advanced things in the future, but for now just trying to keep it simple. I know I'm probably confusing with the way I'm wording all this. haha I attached a picture of what I'd be going for, but maybe not as deep.

Also, where is the best place to learn about all this? What is a good CNC router for a beginner for this type of work. I don't want to spend too much right now, I've been looking at the Shapeoko XL.
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post #9 of 15 (permalink) Old 08-06-2019, 11:40 AM
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Most people do the staining by hand.
I'm sure you could stain the whole board then cut the first layer, then stain again and then cut the second layer but you're still gonna have a lot of touch up.
https://youtu.be/PtDx01kjmn4

Some people (myself included) have attempted multi-species laminations using Oak background, Walnut middle layer and maple top layer. It works perfectly and no staining (But) it ends up looking like stick on letters (which it is.) Good luck!!
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post #10 of 15 (permalink) Old 08-06-2019, 04:23 PM
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Welcome to the Router Forums Kevin.

You could carve away everything except the lettering or just carve away the lettering but you can do a lot more than that with a CNC.

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