Re: Kodak PRD film ?
2011-03-07 by jmelson2
... Well, I actually built the laser pattern component. What I did was get a roll of communication optical fiber. I stripped one end of 8 fibers and
Messages
Browse messages
Page 160 of 707 · 35337 messages matched
Re: Kodak PRD film ?
2011-03-07 by jmelson2
... Well, there is an outfit (Ultrafine) that claims they have a drop-in replacement for the discontinued Kodak PRD film. Also, Kodak still makes some
Re: Kodak PRD film ?
2011-03-07 by jmelson2
... This is a special litho film with a sensitizing dye to make it red sensitive. It is designed specifically for use in a laser photoplotter. I have been
Re: [Homebrew_PCBs] Hydrogen peroxide mixing
2011-03-07 by Randy S.
Did someone fart ? ________________________________ From: Roland F. Harriston To: Homebrew_PCBs@yahoogroups.com Sent: Sun, March 6, 2011
Re: [Homebrew_PCBs] Hydrogen peroxide mixing
2011-03-07 by Randy S.
ok .. I was wondering about the 27% being used only for reactivate for that very reason .. so .. hows the reaction when you put the 27% into the solution to
Re: [Homebrew_PCBs] Hydrogen peroxide mixing
2011-03-06 by Roland F. Harriston
Jim: Your are probably correct. It s just that when you keep reading the same thing over, and over, and over, and over again, you tend to fog over and yearn
Re: [Homebrew_PCBs] Hydrogen peroxide mixing
2011-03-06 by Roland F. Harriston
Boman: If you have very, very basic computer skills, you can do a Google search and get more information on this subject than you will ever need. And.....you
Re: [Homebrew_PCBs] Hydrogen peroxide mixing
2011-03-06 by Jim
Roland ... you seem to have difficulty reading an e-mail as written !!! Jim KI6MZ
Re: [Homebrew_PCBs] Hydrogen peroxide mixing
2011-03-06 by Jim
Hi Randy I used the usual ratio of 3% H2O2 (2 parts) to 31% HCL (1 part) for the initial etch mix. I saved the used etch solutrion in a glass jar and and when
RE: [Homebrew_PCBs] Hydrogen peroxide mixing
2011-03-06 by Boman33
It is a basic problems with news groups and list: A lot of good info is provided but over time it gets buried in countless other good and bad messages. It is
Re: [Homebrew_PCBs] Hydrogen peroxide mixing
2011-03-06 by Roland F. Harriston
Stefan Trethan: You are most likely correct in stating that hydrogen peroxide is available in some pool supply stores, although shocking the pool with
Re: [Homebrew_PCBs] Kodak PRD film ?
2011-03-06 by lists
In article , ... It s quite an interesting phenomena. You could try changing the fixer completly of course. Most rapid
Re: Kodak PRD film ?
2011-03-06 by cunningfellow
... OK - Me bad that time. I have a 16.384 circumference. Now I have drum envy. ... OK - thats he big difference to mine. I am doing 8 pixels per byte. I
Re: Kodak PRD film ?
2011-03-06 by cunningfellow
... Long ago I saw some high contrast paper that went light yellow in the acidic rapid fixer. It had to be used with non-rapid (hypo) fixer. Or it could be
Re: [Homebrew_PCBs] Re: Kodak PRD film ?
2011-03-06 by kabowers@NorthState.net
... You might be better to try these questions in a photography group if there are any that cover processing these days. A call to Freestyle sales might turn
Re: [Homebrew_PCBs] Re: Kodak PRD film ?
2011-03-06 by Peter Leybourne
I m not familiar with Kodak PRD film, however, this is from my photography days. Kodachrome colour slide film has a very distinct colour cast as it ages. The
Re: Kodak PRD film ?
2011-03-06 by jmelson2
... It is Kodak Rapid Fixer, really sold for print paper, I suppose. Kodak suggested diluting the fixer, but that didn t help. The film looks great after
Re: Kodak PRD film ?
2011-03-06 by jmelson2
... Yes, probably that I wrote that in my sleep. OK, my machine has a 6.519 diameter drum, or 20.480 circumference, and a 1024 pulse encoder multiplied by
Re: Kodak PRD film ?
2011-03-06 by Andrew
I d say the math is wrong on both sides. :) IIRC, his drum is around 6.5 diameter, to achieve 20.48 inches circumference. He is generating 20480 bits per
Re: Kodak PRD film ?
2011-03-06 by cunningfellow
... Jon, Is it rapid-fixer or hypo ?
Re: Kodak PRD film ?
2011-03-06 by cunningfellow
... 16.384 drum 1000 dpi 600 RPM (10 r/s) 1 bit per pixel 8 bits per byte I get 20 kilobyte per second Am I missing something
Re: Laser Photoplotter
2011-03-06 by cunningfellow
... If you have a bad shaped laser to start with (Most Laser Diodes do) then you will need a couple of lenses to get to a small spot. Either one lens to do
Re: [Homebrew_PCBs] Hydrogen peroxide mixing
2011-03-06 by Stefan Trethan
No, pool supply stores also sell hydrogen peroxyde and 27% seems to be what I remember as well. But it was more expensive thant the 30% stuff from the
Re: [Homebrew_PCBs] Hydrogen peroxide mixing
2011-03-06 by Roland F. Harriston
I think you have things a little screwed up. I think that you (if you actually do) purchase muriatic acid, which is actually about 27% (30 Baume) hydrochloric
Re: [Homebrew_PCBs] Hydrogen peroxide mixing
2011-03-06 by Randy S.
Thanks Jim .. Glad I m not the only one. Though I havent tried yet. What ratio of that 27% peroxide to hydrochloric acid? Randy
Re: Laser Photoplotter
2011-03-06 by jmelson2
... I doubt a 5 mW laser could remove paint off copper sheet. Maybe a 50 mW IR laser. This would be really tough to focus and set up safely. Also, even a 50
Re: [Homebrew_PCBs] Hydrogen peroxide mixing
2011-03-06 by Jim
I buy and use 27% hydrogen peroxide sold at the pool supply store ... It seems some people don t like green hair caused by chlorine that most people put in
Re: Laser Photoplotter
2011-03-06 by jmelson2
... I m not an optics guy, I just fooled around with it until it worked. First, I got a 670 nm 5mW laser diode, but it sprays the light in a big elliptical
Re: [Homebrew_PCBs] Toner curing
2011-03-06 by Randy S.
Update ... I etched the board from this mornings cure in the oven. I would say that it was also more difficult to clean the toner off the board after etching.
Re: [Homebrew_PCBs] Hydrogen peroxide mixing
2011-03-06 by Harvey White
... 3% Doesn t seem to have additives. Harvey
Re: [Homebrew_PCBs] Hydrogen peroxide mixing
2011-03-06 by DJ Delorie
I use 3% (drug store strength). Start with two parts of that, add one part 37% HCl. You don t need the stronger stuff.
Re: [Homebrew_PCBs] Hydrogen peroxide mixing
2011-03-06 by Randy S.
Thats ... BY a fellow ..... Getting tired .. ________________________________ From: Randy S. To: Homebrew_PCBs@yahoogroups.com Sent: Sat,
Re: [Homebrew_PCBs] Hydrogen peroxide mixing
2011-03-06 by Randy S.
The beauty shop was mentioned on a website but a fellow that uses stronger peroxide then the 3%. I guess its not just me .. .. Funny reply though .. Randy
Re: [Homebrew_PCBs] Hydrogen peroxide mixing
2011-03-06 by Roland F. Harriston
For the life of me............I can t figure out why this guy wants to go rouge on this etch compound! The soup gets edgy and not very safe when you go
Re: [Homebrew_PCBs] Hydrogen peroxide mixing
2011-03-06 by Jim Tonne
... What is its percentage? 3%? He was looking at 10, 20 and 30%. - JimT
Re: [Homebrew_PCBs] Hydrogen peroxide mixing
2011-03-06 by Harvey White
On Sat, 5 Mar 2011 15:54:37 -0800 (PST), you wrote: Stuff they sell in beauty shops is designed to be nice to your scalp, so has (most likely) extra
Re: [Homebrew_PCBs] Hydrogen peroxide mixing
2011-03-05 by Randy S.
Well heck .. this one is all blow outta the water. I went to the beauty supply place .. Theirs is 10, 20 and 30 VOL .. dangit .. AND .. to top that off it has
Re: [Homebrew_PCBs] Toner curing
2011-03-05 by Randy S.
**Why on earth would anyone flame you for passing on a possibly useful tip? :-) - Jan ** * very quietly whispers to Jan .. pssst .. because I didnt do a
Re: [Homebrew_PCBs] Toner curing
2011-03-05 by Jan Kok
... I d guess it was an inkjet. Isn t there a problem with laserjet (xerographic) printing to conductive surfaces? ... Why quench in cold water? Just waving
Hydrogen peroxide mixing
2011-03-05 by Randy S.
I checked with the beauty shop in town .. they have 10 , 20 , 30 % peroxide. I can get the 10 .. I have several bottles of 3%. Can I mix equal amounts of say,
Toner curing
2011-03-05 by Randy S.
OK .. before I start this .. Its something new I was playing with this A.M. and wanted others views .. I cant search the archives from work .. So if it has
Re: [Homebrew_PCBs] Re: Laser Photoplotter
2011-03-05 by mlerman@ix.netcom.com
I m interested in the optics, too. If we could produce a spot of .001 inch or so, we could use it to remove paint resist from a pcb, just like a cnc router.
Re: [Homebrew_PCBs] Re: Laser Photoplotter
2011-03-04 by Philip Pemberton
... Is there any chance of you posting some more info about the optics block? I ve been playing around with an RGB laser set (red diode, green DPSS,
Re: Laser Photoplotter
2011-03-04 by jmelson2
... The machine runs at 1000 x 1000 DPI. I defocus slightly so the raster lines blend in to a solid black. Jon
RE: [Homebrew_PCBs] Re: Kodak PRD film ?
2011-03-04 by Boman33
Thanks Andy, Good Info. Also PVC pipe can be had in even much bigger sizes at a plumbing store. Bertho From: Andrew Volk Sent: Friday, March 04, 2011 00:43
RE: [Homebrew_PCBs] Re: Kodak PRD film ?
2011-03-04 by Andrew Volk
If you want large acrylic plastic tubes, check out eBay. Look for Clear acrylic Plastic Plexiglas Pipe tube . This vendor sells 4 and 6 diameter pipe in
RE: [Homebrew_PCBs] Laser Photoplotter
2011-03-04 by Jeff Heiss
What kind of resolution can you obtain with your plotter? What dot size do you get with the 670nm laser and 13mm FL lens? _____ From:
Laser Photoplotter
2011-03-04 by jmelson2
A picture of my photoplotter is at http://pico-systems.com/photoplot.html Jon
Re: Kodak PRD film ?
2011-03-04 by jmelson2
... Yes, if I could have found the right size aluminum tube, I might have used that to start. Something slightly over 6.5 just didn t seem available. I
Re: First CNC milled board
2011-03-03 by byron.woltman
Craig, My first milled PCB seemed to take F-O-R-E-V-E-R to mill. Turned-out the Gcode was not at all optimized. After running the Gcode through an optimizer,