Hello Russell,
Wednesday, January 30, 2002, 01:14:08, you wrote:
RS>
JanRwl@... wrote:
>>
>> In a message dated 29-Jan-02 03:00:04 Central Standard Time,
>> rjshaw@... writes:
>>
>> > What methods do back-yarders use to get the sharpest
>> > PCB tracks? Photographic? Milling?
>> >
>> >
>>
>> When I need best I can do without having a pro-shop do etching, I use
>> contact-printing of negatives with Kepro stuff. But I haven't done a
>> home-brew "photographic" in so long I don't even know what the various
>> solutions were called!
>>
>> I have done nothing more complex than a 6-IC little lashup in years, and I
>> get by with Radio Shack and whoevermailorderitwas "pressure sensitive"
>> "rub-on" stuff. That works really fine, if done right, actually!
RS> I was wondering how much resolution the various
RS> methods get. I've found the best printers are
RS> epson stylus colour inkjets (400 and higher),
RS> used with epson transparencies (its coated
RS> with an absorbing layer instead of 'sandpaper').
RS> Using a lightbox etc, i can get 6-8mil tracks
RS> and spacing. Works with precoated negative
RS> boards, and spray-on positive resist (PRP).
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And I replied:
Photographic method preferred. I use positive precoated boards and
have a frend with typesetter who is producing the positive artwork for
my boards. It is the cheapest method. The 3 sqft of artwork costs
approx $4, and those 3 sqft ia a lot of boards!
So compared with the price of Epson transpaerncies+ink cartridges (the
most expensive part - printers are el cheapo, consumables are the
company lives on), Someone's typesetter is the best choice.
--
Best Regards,
Zoran, Belgrade, YU
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