Homebrew PCBs

I have been playing with laser trying to make PCB' but have not come up with 
a effective way, the toner transfer seems to be faster and easier than 
laser. CE mark and thermark wont work, because you cant remove the marking 
for solder points. I have tried painting and rastering the paint off but the 
problem with burning paint or any other material, it leaves some burnt 
residue which cannot be cleaned off without removing the paint esp. if the 
gap between traces are fine, giving you a jagged edge when etched. I am 
still looking for folks coming out with innovative ideas to make it work. I 
have a Epilog TT  45 W laser.

Kim

----- Original Message ----- 
From: "Henry Liu" <henryjliu@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Wednesday, October 28, 2009 11:36 PM
Subject: Re: [Homebrew_PCBs] Re: Cool results with CO2 laser


> There's been some videos where you can ablate completely black spray paint
> with a CO2 laser.
>
> The solder mask stuff is different because there's no way it's coming off.
> It's chemically bonded to the copper according to thermark.
>
> On Wed, Oct 28, 2009 at 11:59 PM, Stefan Trethan 
> <stefan_trethan@...>wrote:
>
>>
>>
>> This is like the second law of thermodynamics - In the end you will
>> always end up with thermal transfer ;-)
>>
>> Anyway, if it is more precise then that's good, but you wrote
>> initially one has to remove the material between traces after cutting
>> with the laser. Isn't this weeding very time consuming with complex
>> boards? Isn't there a danger that the trace material is lifted away
>> too?
>>
>> I wonder what would happen if you coated the PCB with toner or
>> stereolithography powder. Could you burn on the pattern and blow away
>> the remaining dust?
>>
>> ST
>>
>>
>
>
> [Non-text portions of this message have been removed]
>
>
>
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