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Neon_WA
Joined: 08 Nov 2008
Posts: 7146
Location: Margaret River, West Australia
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 Posted: Thu Feb 12, 2009 5:11 am Post subject: Unfinished laser work |
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picked this up a few days ago and noticied a four character sSpec.
after checking it out i realised that the laser marking the heat-sink must of failed for a short time while writing.
The zero (0) of the part number had not been completed and the S of the sSpec had been completely missed. 
I was wondering if anyone had other examples like this 
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debs3759
Joined: 18 Jan 2006
Posts: 9477
Location: Northampton, Divided Kingdom
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| Posted: Thu Feb 12, 2009 5:35 am Post subject: Re: Unfinished laser work |
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| Neon_WA wrote: | picked this up a few days ago and noticied a four character sSpec.
after checking it out i realised that the laser marking the heat-sink must of failed for a short time while writing.
The zero (0) of the part number had not been completed and the S of the sSpec had been completely missed.
I was wondering if anyone had other examples like this |
Looks like some of the print lifted off, rather a laser fail. Printing isn't done by laser 
I hesitate to say it, but I can't see what would lift the print of the heatsink of an original boxed Pentium, so wonder if you might have got a remark (although I can see no other obvious evidence of that...).
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Neon_WA
Joined: 08 Nov 2008
Posts: 7146
Location: Margaret River, West Australia
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| Posted: Thu Feb 12, 2009 6:50 am Post subject: |
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when you look at the "printing" on any pentium heatsink under a microscope you can see the trace of the etching. Where each letter or number starts and ends.
The etching extends through the black anodizing coating to the aluminium below. This is why you can get corrosion around the characters on the heat-sink. The anodizing slows down the corrosion of the aluminium.
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andamus
Joined: 06 Dec 2004
Posts: 1029
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| Posted: Thu Feb 12, 2009 8:14 am Post subject: |
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Hi,
here is my Boxed P150, but I dont know if it's laser engraved or printed, with my finger I cannot feel any engraving on it. |
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Neon_WA
Joined: 08 Nov 2008
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Location: Margaret River, West Australia
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| Posted: Thu Feb 12, 2009 8:54 am Post subject: |
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| andamus wrote: | Hi,
here is my Boxed P150, but I dont know if it's laser engraved or printed, with my finger I cannot feel any engraving on it. |
Anodizing is normally only 25 microns thick, the etching wouldnt be much more than that. Etching that deep wouldnt be felt and the naked eye can only see something as big or deep as 75 microns, but under 20x magnification it is quite clear.
It has become another tool in my toolbox to pick the fakes
edit >>>> i just noticied on yours you can see where the zeros are started... about 10:30 on the circle, same as the unfinished zero on mine
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There are 10 types of people in this world:
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andamus
Joined: 06 Dec 2004
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| Posted: Thu Feb 12, 2009 9:21 am Post subject: |
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LOL, I was sure that the print was mabe with silver ink ...
and the your zero ends exactlywhen the "slash" starts |
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Neon_WA
Joined: 08 Nov 2008
Posts: 7146
Location: Margaret River, West Australia
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| Posted: Thu Feb 12, 2009 5:49 pm Post subject: |
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| andamus wrote: | | LOL, I was sure that the print was mabe with silver ink ... |
i thought they were printed also, until i started checking things under the microscope.
| andamus wrote: | | and the your zero ends exactlywhen the "slash" starts |
that is just coincidence under the microscope the zero is completely formed first, then the slash is done seperately.
You can see it on the second zero in "BP80502150" on yours.
also another feature i can pick up is that the horizontal lines of the # are done first then the two slash lines done over the top.
| Neon_WA wrote: |
It has become another tool in my toolbox to pick the fakes
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FYI some of the fakes have printed text on the heat-sink, but some have been "laser-printed", depending on the quality of the fake
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There are 10 types of people in this world:
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Neon_WA
Joined: 08 Nov 2008
Posts: 7146
Location: Margaret River, West Australia
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| Posted: Wed Feb 18, 2009 9:59 pm Post subject: |
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after playing with some excess heat-sinks i will revise my thoughts on the text printing.
It is not lasered through the anodizing coating.
It is not printed with ink (well not by standard methods)
The text is "written", not done all at once like being stamped, but one point at a time as if you are writing.
The text material is very reactive to HCL acid (dissolves) << note this, be very careful what you clean the text with
When the text material is removed, an impression (indent) is left where the text was.
So what ever is applied to form the text is either hot or chemically reacts with the aluminium.
edit (more info) >> once the text coating is dissolved, the reaction with acid slows down so almost nothing. So the text is a different compound to the aluminium below. Also once the shiny text material is gone the anodized material is still present underneath, though there are some places where the text extends through the full thickness of the anodizing to the bare aluminium below.
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There are 10 types of people in this world:
those who understand binary and those who don't. ~Author Unknown
http://www.x86-guide.net/Neon-WA/en/collection.html
Last edited by Neon_WA on Wed Feb 18, 2009 11:41 pm; edited 1 time in total |
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Wizzard1
Joined: 05 Nov 2006
Posts: 930
Location: Boston MA USA
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| Posted: Wed Feb 18, 2009 11:31 pm Post subject: |
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| How about one of those little drills, or impact pens, jut stripping off the annodization? HCL will dissolve aluminum bare, but annodized aluminum is basically the same as corundum, ruby and sapphire and quite resistant to many things. |
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