Old 10-08-2015, 09:53 PM #1
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Default [Solved] Aluminum's ability to transfer heat w/ paint?

I received my Aluminum plate today but noticed it isn't very nice looking. Some sides have different colors, while others even have grooves in them.

That being said, I went ahead and bought some metallic paint to help make it look a little nicer and was told this might reduce aluminum's ability to take heat away from the laser, which would make sense to me as this is a barrier between the metal-metal connection. Thing is, I left one side without any paint. Should I paint that as well or leave it as is to allow the laser head to sit against the metal itself?

Thanks,
Alex


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Old 10-08-2015, 11:18 PM #2
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Default Re: Aluminum's ability to transfer heat w/ paint?

I don't think a layer of paint that thin would significantly affect the heat transfer on it. Also, can't you remove it with some kind of paint stripper if needed?
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Old 10-08-2015, 11:26 PM #3
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Quote:
Originally Posted by gozert View Post
I don't think a layer of paint that thin would significantly affect the heat transfer on it. Also, can't you remove it with some kind of paint stripper if needed?
Thanks for the answer gozert!

I can if need be, but I read online removing paint as such can release some lead or other dangerous toxins into the air. I also never knew you had to be 18 to buy aerosol paint

Edit: A laser would also never get hot enough to light the paint on fire, correct? The can says to not exposure to temps. over 110 Fareinheit or 48 Celsius!

-Alex

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Old 10-09-2015, 12:05 AM #4
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Default Re: Aluminum's ability to transfer heat w/ paint?

If your laser gets that hot, the paint won't be your biggest worry
Why not grab a sanding block or sandpaper and sand away the grime/blemishes? I always loved the look of sanded metal, if you want it to look super neat you can sand in just one direction, or if you wanna be super fancy you can burnish the surface, look it up as its kinda tough to explain.
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Old 10-09-2015, 02:12 AM #5
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Quote:
Originally Posted by Gabe View Post
If your laser gets that hot, the paint won't be your biggest worry
Why not grab a sanding block or sandpaper and sand away the grime/blemishes? I always loved the look of sanded metal, if you want it to look super neat you can sand in just one direction, or if you wanna be super fancy you can burnish the surface, look it up as its kinda tough to explain.

Haha! But it should still work fine as a heat barrier right?

-Alex

Last edited by Hap; 10-09-2015 at 02:14 AM.
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Old 10-09-2015, 02:36 AM #6
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Default Re: Aluminum's ability to transfer heat w/ paint?

Quote:
Originally Posted by LeHap View Post
I read online removing paint as such can release some lead or other dangerous toxins into the air. I also never knew you had to be 18 to buy aerosol paint
That law was enacted many years ago to help reduce graffiti. It didn't work, only law abiding people under the age of 18 who wouldn't ever use it for graffiti care about the law, the criminals will still get their hands on cans of spray paint.

Maybe you could put the laser head on the plate and draw around it and paint only outside the lines.

Alan
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Old 10-09-2015, 02:41 AM #7
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Quote:
Originally Posted by Pi R Squared View Post
That law was enacted many years ago to help reduce graffiti. It didn't work, only law abiding people under the age of 18 who wouldn't ever use it for graffiti care about the law, the criminals will still get their hands on cans of spray paint.

Maybe you could put the laser head on the plate and draw around it and paint only outside the lines.

Alan
Thanks for the input Alan!

I decided to paint all of it as it would look much nicer that way. Hopefully it works well!

-Alex
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Old 10-09-2015, 03:09 AM #8
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Default Re: Aluminum's ability to transfer heat w/ paint?

The can says to not expose to temps. over 110° Fahrenheit or 48° Celsius because the can might explode. Also when the paint is still wet or a liquid it is very flammable.
Once the paint is cured/dry it can be exposed to temperatures much higher than that.
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Old 10-09-2015, 03:49 AM #9
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Talking Re: Aluminum's ability to transfer heat w/ paint?

The heat sink needs, ideally, to be paint free, and as smooth as possible to maximize conduction.

The more contact surface area, the better the conduction.

Two smooth surfaces will have more contact than painted, or rough surfaces, etc.
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Old 10-09-2015, 04:01 AM #10
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Default Re: Aluminum's ability to transfer heat w/ paint?

^Thanks to both of you guys!

@Teej Exactly the answer I was looking for. Fortunately, most lab lasers already do a pretty good job of maintaining heat levels low and the plate will be an extra layer of protection. At least, much better then running on wood

-Alex
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Old 10-09-2015, 04:09 AM #11
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Default Re: Aluminum's ability to transfer heat w/ paint?

yes, paint will slow down heat transfer. It's worse than thermal compound. Ideally two perfectly smooth metallic surfaces would do the best at heat transfer. That's in a perfect world though. If you want to separate the two devices easily, two smooth surfaces with a small amount of thermal compound the best method.

Quote:
Originally Posted by Pi R Squared View Post
That law was enacted many years ago to help reduce graffiti. It didn't work, only law abiding people under the age of 18 who wouldn't ever use it for graffiti care about the law, the criminals will still get their hands on cans of spray paint.

Maybe you could put the laser head on the plate and draw around it and paint only outside the lines.

Alan
Don't forget about using paint as an inhalant.
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Old 10-09-2015, 04:13 AM #12
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Default Re: Aluminum's ability to transfer heat w/ paint?

Got it Dr. Evil!

Still, a thin layer of paint should still allow the Labby to transfer heat onto the Aluminum correct?

-Alex
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Old 10-09-2015, 04:38 AM #13
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Talking Re: Aluminum's ability to transfer heat w/ paint?

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Originally Posted by LeHap View Post
Got it Dr. Evil!

Still, a thin layer of paint should still allow the Labby to transfer heat onto the Aluminum correct?

-Alex
Sure, think of it like this:

You can make paint hot. When the paint is hot, it will make the metal its painted onto, hot too.

It just won't transfer that heat as quickly, as it acts as an insulator, albeit with a small R value.


Last edited by Teej; 10-09-2015 at 04:39 AM.
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Old 10-09-2015, 04:59 AM #14
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Default Re: Aluminum's ability to transfer heat w/ paint?

it is Al have it anodized or mirror polish it (400grit -> 800 -> 1500 -> buff with white compound -> buff with red or blue compound)
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Old 10-09-2015, 05:11 AM #15
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Default Re: Aluminum's ability to transfer heat w/ paint?

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Don't forget about using paint as an inhalant.
Oh yes I forgot about that, but I didn't know anyone used spray paint for that, I thought it was only canned paint, polyurethane or some such thing. I would think it would be very unsafe to inhale any type of spray paint.

Alex one thing you could do that would be easy, before you spray paint the plate, cover one side with masking tape, put the laser head on it and cut around it with an X-acto knife or razor blade and peel off the excess tape and then spray paint it, and after it dries then remove the tape and you have an unpainted area just the right size.

Alan
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Old 10-09-2015, 05:20 AM #16
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Default Re: Aluminum's ability to transfer heat w/ paint?

I vote no paint, it will insulate the aluminum from optimum heat transfer.
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Attention new brothers of the collimated light!

Newbie advice: Please take the time to first make an introduction in the Welcome section before posting questions.


Divergence to spot size calc: - 1 mRad is about .057 degrees which expands to be very roughly ~10% the diameter of the moon or sun at their distances.

Divergence Calculator: pseudonomen137's JScript mRad Calculator - Measure your lasers beam dia. at 1 foot & then 20'.

Online calc. to determine spot intensity at different mRad's & powers: http://tinyurl.com/divergence-calculator

Laser Power Density Calculator: Laser Power Density Calculator - Ophir

Build a beam expander to reduce divergence: http://tinyurl.com/BeamExpander

University YAG Project The Professor's Homebuilt Lasers Site - YAG Lasers

YAG Power Calc. Laser Peak Power Calculator - Ophir

Angular Size Calculator; use with diode angle of radiation spec. for lens dia. at FL: Angular Size Calculator

RHD's Calc: http://lsrtools.1apps.com/RelativeBr...&useRaleigh=on

High Current Pulse Drivers: https://tinyurl.com/ya7whuk3
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