Re: [Homebrew_PCBs] PCB Drilling Viewer
2012-04-17 by Charles R. Patton
I described setting up a web cam to view the bottom side of the PCB while drilling from the top side. I use a sacrificial piece of plastic that I drill first
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Re: Alternative photoresist chemicals - Idea?
2012-04-16 by designer_craig
I did a little research on the silkscreen emulsions by looking at the chemical consultants web site and the MSDS for some of their products.
Re: PCB Drilling Viewer
2012-04-16 by David
A figure of speech, sorry, your implementation, is the same as the cross hair explanation, the base of the drill press will already have a hole lined up with
Re: [Homebrew_PCBs] PCB Drilling Viewer
2012-04-16 by Harvey White
... Agreed on the Proxxon. However, I have a design where I am implementing the bottom drill with a Proxxon. Main problem right now is the board holddown.
Re: [Homebrew_PCBs] PCB Drilling Viewer
2012-04-16 by Simao Cardoso
... Hi, i remember some old discussions on this list about a drill press that I could never understand how it works, until saw that image. I tried to search
Re: PCB Drilling Viewer
2012-04-16 by bebx2000
I am sorry, but I don t see any mention of cross-hairs in his implementation. My take on this is that he is blackening the circular insert, positioning the
Re: [Homebrew_PCBs] PCB Drilling Viewer
2012-04-16 by Malcolm Parker-Lisberg
Baxter Thanks, but not particularly for the viewer, but all the other articles on the page. Malcolm I don t suffer from insanity I enjoy it! Mene, mene,
Re: PCB Drilling Viewer
2012-04-16 by David
Shannon is correct, once you have made you initial alignment, without a PCB in place, i.e. just looking at the drill bit through the drill stands base plate
Re: [Homebrew_PCBs] PCB Drilling Viewer
2012-04-16 by Shannon Haworth
The cross-hairs on the view finder show where the hole will be, once it is made. No need to see the bit, the two are aligned. ... [Non-text portions of this
PCB Drilling Viewer
2012-04-16 by bebx2000
Could anyone offer an opinion on this drilling fixture? http://www.imajeenyus.com/electronics/20080628_pcb_drilling_viewer/index.shtml I can see that it shows
RE: [Homebrew_PCBs] Re: Alternative photoresist chemicals - Idea?
2012-04-16 by Jeff Heiss
Leonardo, can you elaborate on the chemicals you used and the process you used for applying, developing, and etching? Did you use a recipe for the chemicals?
Re: [Homebrew_PCBs] Re: Alternative photoresist chemicals - Idea?
2012-04-16 by Charles R Patton
Re direct application of silk screen emulsions to a PCB . I don t generally expect this to work very well. I previously commented on this. Please see:
Re: Spin coating small PCB?
2012-04-15 by sailingto
Thanks for the info Craig - I m sure photo resist is better than TT, but I m comfortable with TT, it does what I need. I use large pads and traces so they
Re: [Homebrew_PCBs] Re: Alternative photoresist chemicals - Idea?
2012-04-15 by Roland F. Harriston
Thanks for information David. I know nothing about Gum Arabic. Roland F. Harriston, P.D. ******************
Re: Alternative photoresist chemicals - Idea?
2012-04-15 by David
Roland, Sorry, it was an addendum to my previous message, Gum Arabic could be used as the emulsion base, as can egg yoke, cream etc. when mixed with the
Re: [Homebrew_PCBs] Re: Alternative photoresist chemicals - Idea?
2012-04-15 by Lessa, Leonardo
Hello, A couple of years ago, as Vesko, I used homebrew photo resist based on chemicals used for silk screen printing. I have had a good results with this
Re: [Homebrew_PCBs] Re: Alternative photoresist chemicals - Idea?
2012-04-15 by Roland F. Harriston
I Gum Arabic photosensitive? And does it polymerize (harden) after being exposed to light? Roland F. Harriston, P.D. ****************** ... [Non-text portions
Re: [Homebrew_PCBs] Re: Alternative photoresist chemicals - Idea?
2012-04-15 by Roland F. Harriston
I don t know if the bake operation would really be helpful. The bake step was important with the spirit-based polymers like Kodak KPR, etc in order to drive
Re: Alternative photoresist chemicals - Idea?
2012-04-15 by David
Another emulsion base for homebrew resist is Gum Arabic......
Re: Alternative photoresist chemicals - Idea?
2012-04-15 by David
I think the general concensus is it will probably work, using the spinning method to achieve a thin uniform layer and baking it for a short while, then expose
Re: Alternative photoresist chemicals - Idea?
2012-04-15 by mark
That s a good question as I was thinking about the same thing when I got a screen printing setup a few months ago, but haven t had time to even do more then
Re: Alternative photoresist chemicals - Idea?
2012-04-15 by David
There are both types available, one ready mixed, [would imagine a shelf life of a couple of years] and a two part product, with a sensitizer, [that probably
RE: [Homebrew_PCBs] Re: Alternative photoresist chemicals - Idea?
2012-04-15 by Jeff Heiss
What is the shelf life of silkscreen emulsion? Do you have to mix the emulsion with a sensitizer? Jeff _____ From: Homebrew_PCBs@yahoogroups.com
Re: [Homebrew_PCBs] Re: Alternative photoresist chemicals - Idea?
2012-04-15 by Roland F. Harriston
Ulano was the company that made the stuff I purchased many years ago. I think they also made a material called Rubylith . Old-time microstripline designers
Re: [Homebrew_PCBs] Re: Alternative photoresist chemicals - Idea?
2012-04-15 by Randall Morgan
Silk Screen Emulsion Source: http://www.silkscreeningsupplies.com/diazo-photo-emulsion?gclid=CNDprfSXt68CFYYHRQodu2zWjQ I have no idea if it works but would be
Re: [Homebrew_PCBs] Re: Alternative photoresist chemicals - Idea?
2012-04-15 by Roland F. Harriston
What I am thinking about: Forget about the silk screen . which in most modern silk screening operations is actually a screen made of stainless steel, and
Re: Alternative photoresist chemicals - Idea?
2012-04-15 by David
Silk screen emulsion is UV sensitive, when exposed it becomes very hard,(i.e. To block the printing inks) the unexposed area is simply washed off, ready for
Re: Alternative photoresist chemicals - Idea?
2012-04-15 by Vesselin Zhelezov
Hi David, Forty years ago I used homebrew photo resist based on chemicals used for silk screen printing. It was very cheep and worked just fine. You don’t
Re: Alternative photoresist chemicals - Idea?
2012-04-15 by Vesselin Zhelezov
Hi David, Forty years ago I used homebrew photo resist based on chemicals used for silk screen printing. It was very cheep and worked just fine. You don’t
RE: [Homebrew_PCBs] Re: Alternative photoresist chemicals - Idea?
2012-04-15 by Boman33
I do not know if the silk screen emulsion will stick and protect copper. I think resolution would be OK. Many years ago I was silk screening text and graphics
Re: [Homebrew_PCBs] Alternative photoresist chemicals - Idea?
2012-04-15 by Leon Heller
... I think it was the same stuff that was used for ordinary silkscreen printing. They couldn t produce very fine tracks with that process, but it didn t
Re: [Homebrew_PCBs] Re: Alternative photoresist chemicals - Idea?
2012-04-15 by Zoran A. Scepanovic
... Something like: It was looong time that I used it to make screens for producing
Re: [Homebrew_PCBs] Re: Alternative photoresist chemicals - Idea?
2012-04-15 by Roland F. Harriston
If I recall correctly, the silk screen emulsion is UV sensitive. The question is if it can hold up under any of the commonly used PCB etchants like ferric
Re: Alternative photoresist chemicals - Idea?
2012-04-15 by tda7000
That would all depend on whether the silk screen emulsion stuff was UV sensitive and reacted the same way as normal UV resist, to actually stay on or wash off
Re: Alternative photoresist chemicals - Idea?
2012-04-15 by David
Leon / Andrew, Sorry, I dont think i made myself clear, I was suggesting the emulsion used in silk screen printing to be put directly onto the PCB using
RE: [Homebrew_PCBs] Alternative photoresist chemicals - Idea?
2012-04-15 by Andrew Volk
Leon - But would the material use in the silkscreen stick to the copper clad and serve as a resist after exposure? _____ From: Homebrew_PCBs@yahoogroups.com
Re: [Homebrew_PCBs] Alternative photoresist chemicals - Idea?
2012-04-14 by Leon Heller
... PCBs were made that way at English Electric Ltd, Kidsgrove, when I was a student there in 1962. The pattern was created on a silk screen, it was placed in
Alternative photoresist chemicals - Idea?
2012-04-14 by David
Hi All, After looking at Craig s fasinating PCB spinning methods, an idea came to mind, seeing as the regular chemicals seem to be rare and expensive, has
Re: Spin coating small PCB?
2012-04-14 by designer_craig
Spin coating has been around for years. In the early semiconductor days it s how they would coat the wafers for processing. You can get micron accuracy with
Re: Spin coating small PCB?
2012-04-14 by designer_craig
With the AZ111 the solvents flashed off quite fast but you did have to bake the board for 15 minutes at I think 120 or 15O F to harden the resist. Dust wasn t
Re: Spin coating small PCB?
2012-04-13 by sailingto
Now that is just too cool!!! This is a method to coat standard old PCB boards to use in photo resist? I understand photo resist does better than TT, but have
Re: Spin coating small PCB?
2012-04-13 by David
Craig, Seriously impressive method of applying photo resist, certainly food for thought!! Beats the laminator method hands down!! How do you dry the board
Re: Spin coating small PCB?
2012-04-13 by designer_craig
Wayne, I used to spin all sorts of boards. Used Shipley AZ111 for the resist. This was a solvent based, I would pre wet the board then spinn off the excess.
Re: Green Film temperature
2012-04-13 by sailingto
A direct link to the green foil: http://www.pcbfx.com/main_site/pages/products/toner_foils.html
Re: Green Film temperature
2012-04-13 by David
Take a look at this: http://www.pcbfx.com/main_site/pages/start_here/overview.html Regards,
Re: [Homebrew_PCBs] Green Film temperature
2012-04-13 by Shannon Haworth
Unfamiliar with the green film from Pulsar, do you have a link to it? ... [Non-text portions of this message have been removed]
Re: Green Film temperature
2012-04-13 by sailingto
Thank ya ll for info David, Harvey - I ve got an Apache laminator and the temp is fully adjustable from 100ºF up to 379ºF - it is better than the GBC I had
Re: Green Film temperature
2012-04-13 by David
Ken, I use a modified GBC laminator, and its limit is 165 C - 169 C [329 F -336 F], i put the green TRF and white TRF through two times and get good results,
Re: [Homebrew_PCBs] Green Film temperature
2012-04-13 by Harvey White
... foil setting, no idea of temperature. Run it twice. I have a similar problem at times, but I ve also had the film simply not adhere, regardless of
Green Film temperature
2012-04-13 by sailingto
Hello all, the green film from Pulsar - what is the best temperature to run it thru laminator? I ran thru at 370ºF and that seemed like it might be a tad