Hello Radek,
I've found that the HP printers tend to do "outlines" of the printed images, with the centers either completely empty or poor quality. One thing I tried that worked pretty well was to cover the copper with some Mispro Yellow ink. I just smeared pit on and let it dry. The printer worked much better! In fact, I found that you can dilute the Mispro even 10:1 and it would still work. The Oki might need the same treatment.
Mark
At 07:52 AM 8/13/2014, you wrote:
I've found that the HP printers tend to do "outlines" of the printed images, with the centers either completely empty or poor quality. One thing I tried that worked pretty well was to cover the copper with some Mispro Yellow ink. I just smeared pit on and let it dry. The printer worked much better! In fact, I found that you can dilute the Mispro even 10:1 and it would still work. The Oki might need the same treatment.
Mark
At 07:52 AM 8/13/2014, you wrote:
Hello Mark!
I read that was previously perform a many number of attempts over the transfer of toner powder on the plate.
eg. voltage changes, gel XY
I currently have very old printer OKIPAGE 10ex and prepared machanics to direct toner transfer, but have problem with quality of traces on copper. Toner is unevenly distributed, some parts are almost transparent. Edges are OK.
Have not tried etch, yet.
On regular paper prints are good quality - solid black large areas and sharp edges.
Already i have toner powder replaccement. Before i try to buy original toner powder i have a question:
Do You try some metods to improve covering boards by toner powder? Special chemical or mechanical copper board pre-(or post-) preparation?
Great job with E260 (both versions- I read all carefully)!
--
Radek
2014-08-10 14:13 GMT+02:00 Mark Lerman mlerman@... [Homebrew_PCBs] < Homebrew_PCBs@yahoogroups.com>:
Â
No, I have no need for traces that fine, but now that I have a stable "platform" I want to test the limits. Once I get the MCU version online I am going to work on double sided boards.
Mark
At 05:56 AM 8/10/2014, you wrote:
5/5 is better than most cheap board houses would advertise (6/6 is fairly typical). Ã Do you really need to get down to that? Ã 8/8 is what most people strive to achieve at home.
On Sat, Aug 9, 2014 at 9:01 AM, Mark Lerman mlerman@... [Homebrew_PCBs] < Homebrew_PCBs@yahoogroups.com> wrote: ÃÂ
Still waiting for some parts for the MCU version,l but I just ran a test board and found:
1 - All 5 mm traces are intact.
2 - 5 mil traces/10 mil spaces works perfectly - no shorts, no open traces, no "near misses".
3 - 5/5 does not. The traces are intact but they spread into the spaces and short together in many areas. The obvious conclusion is that the traces are wider than 5 mil.
One solution might be to make the traces even thinner so if they spread it won't obliterate the spaces.
What I need is a good way to measure the thicknesses. I do have a stage micrometer for my microscope, but I really would like a USB microscope with software to measure. Does anyone have a suggestion?
I could also use a test pattern that has a variety of traces/spaces. Does anyone have one in some common format?
Thanks for your encouragement and suggestions.
Mark