I can make 6.66mil lines and spaces _just_ with my 600 DPI lexmark. But
the spaces will come out under and the lines above that, so it is better
to keep the lines slightly thinner than the spaces.
i didn't see the 600DPI laser to be the limit, it is under 2 mil
resolution. The problem of underetchning gets me before that, for example
a 3.33 mil line (i think) will no longer stay intact during etching while
it is fine on the toner.
Of course the edges will not be dead straight, but the transfer seems to
smooth them out a lot, and it isn't usually a problem for me.
so 6.66/6.66 is really pushing it, but it does work. for 0.5mm spacing
QFPs i use something close to 8/12 which works very reliable.
ST
On Tue, 25 Apr 2006 16:38:34 +0200, Kamal Shankar
<
kbshankar2000@...> wrote:
>> I think you can do 8 mil., but I don't know how well
>
>> it will
>
>> transfer to the copper and how well it will hold up
>
>> during etching.
>
>
> My point exactly. Along your lines, I can print 5mil
>
> very well udinh my 600dpi laser, but it's badly
>
> smudged after the transfer.
>
>
> Would getting a 1200dpi help (perhaps the edges would
>
> be clearer) ?
>
>
>> The best I could get reliably was .012" 12 mil wide
>
>> traces. The
>
>> printing doesn't appear to be the problem as much as
>
>> the transfer
>
>> and etching of such small traces.
>
>
> The crucial point in TT is the paper. The paper will
>
> make or break the whole process. But even with good
>
> laser sheets, 8/8 has NEVER worked for me @ 600dpi
>
>
> Perhaps the edges were not that good.
>
>
> What I am interested in is whether you guys think if a
>
> 1200 dpi laser would be more than adequate for the 8/8
>
> boards.