It is true that most board houses would usually plate it up, but there
is nothing that says it can't be etched.
Of course undercut will be a lot more severe, and etching time will be
much longer, but if the features are large enough it should not be a
problem.
ST
On Mon, Dec 7, 2009 at 12:26 AM, Simao Cardoso <simaocardoso@...> wrote:
> Alexis Shaw wrote:
>>
>> I think that in order to do 3 oz one must use semi-additive etching.
>> that is put doen the photoresist and then electrroplate, strip the
>> resist and etch the whole board.
>
> You mean Negative print the resist, copper pattern plating up to 105µm,
> metallic resist plating, resist stripping, metallic resist compatible
> etchant and metallic resist strip?
>
> Milling the board seems much better!
>
> I thought it could be done with 1 step etching since some processes used
> in metal engraving seems very similar to pcb etching.
>
>
>
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>
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