Russell,
Well I did a QFP144 which has 0.25mm pads with 0.2 mm spacing between
the pads, that's the tightest I could find in EAGLE and placed two of
them connected one to the other with about 1/4 of the pins and printed
it.
Results are very good. Clear space between the pins, I can etch this
size no problem.
So I made a few 2.5 mil traces (which I can't etch reliably) and wired
between the QFP144 pins.... OK that failed, that asking much than this
laserjet can do, which is 0.005"
About the clogged Epson, I only ever used the real Epson cartridges, in
fact I have an unused one here, out of date now...
Blackness: No the exposure will still eat your lunch, even if you have a
Litho film the light source will scatter and cause problems.
Get to know your light source, then blackness is not a problem.
26 mil is hughes.... Not really for Home Brew PCB making (the theme for
the forum) which for the most part "implies" hand soldering MSOP is
about the smallest I like to do comfortably.
I still think there has to be a reason so many people are dumping Epson
Inkjet printers for $5 ! as you are referring to eBay.au I assume
Australian dollars...
In the final conclusion, I still maintain that for Home Brew PCB making,
the LaserJet is cheap to run and does a fine job. Even at AU$5 I would
not waste time on an Epson printer, the two I trashed cost US$475 at the
time.... I doubt the print head problem is any better.
Please continue to use your Epson. Please do NOT spread misinformation
about LaserJets, form reading your post, one could be believe Espons is
the ONLY solution, when the fact is "Average" hobby / homebrew PCB
maker will never reach the level of a QFP256 pin device. We have people
here still talking about Iron On transfers.... :-)
Best Regards
Hans W
PS I'm not adding anymore to this thread, it's redundant..
Russell Shaw wrote:
> Hans Wedemeyer wrote:
> ? Mike,
> ? That's the reason I posted this today.... I'm also sick of the same
> old
> ? crap about lasjer jet not being any good... it really is
> ? misinformation...
>
> Show me a footprint of 0.5mm pitch 256 pin QFP done on a laser without
>
> most of the pads shorting and i'll be happy.
>
> ? The other point that I can't abid is them needless search for
> absolute
> ? blackness in the film... Special this and special that... hog
> wash...
>
> The blacker the film, the less critical the exposure.
>
> ? I use MSOP a lot of the time that's 0.0256? (0.65mm) and have no
> problem
> ? at all.
>
> 26mil is huge.
>
> ? With regards to 8 mil..... well I demonstrated today, 10 mil is run
> of
> ? the mil and 8 mil is just as easy.
>
> Fine-pitch footprint?
>
> ? I remember a stupid board I was presented with some years ago, it
> was a
> ? very simple circuit about 10 components and the board was about 4? X
> 4?
> ? ( Deer feeder controller) and the person used 8 mil lines and the
> ? smallest pads ! When they tried to change components of course
> without a
> ? vacuum driven desoldering tool, pads lifted of and traces got
> broken.
> ? The golden rule is when you have the space USE IT....
>
> Most of the time i use 20mil tracks and 60-80mil vias.
>
> ? I can do 5 mil if I use Apollo CG7060 film, 3M CG 3300 is only good
> to
> ? 10 mil (8 at a stretch, with some touch up afterwards)
> ?
> ? During the years I have trashed two Epson Inkjet (700 dpi) printers
> ? because the nozzles got blocked and I tried everything to devolve
> the
> ? hardened ink, but nothing worked. At the time Epson offered a head
> ? replacement for $130.... I went out and purchased a HP inkjet
> printer
> ? instead for less.
>
> Using crap ink i guess. I've used refill stuff just for printing
> on paper and sometimes it gets clogged after a few months. The best
> way to get it working again is to put in a genuine cartridge and
> it flushes the old crap real easy.
>
> ? If people are dumping Epson Inkjet printers for $5 I'd say good luck
> to
> ? anyone buying one, perhaps buy two and hope the parts are
> ? interchangeable... There are also good deals on eBay for HP Laser
> ? Jets...
>
> I just got a lexmark 4039 R+ 1200dpi, extra paper tray, duplexer
> (double-
> sided printing:), network card, 16ppm for AUS$200 off ebay.com.au.
> Great for printing big manuals;)
>
> ? I've only put one new toner in this LaserJet since I purchased it
> two
> ? years ago, my other one (same type, yes I have 5 printers...) is
> about 6
> ? months older than that and it's on the third toner.
> ? I buy real HP toners for about $48.... I wonder what Epson's inkjet
>
> ? cartridges cost... !
>
> Black costs AUS$25-35, but i make them last 6 months to a year by
> using
> it only for PCBs. Laser is much cheaper for paper printing.
>
>
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