Re: Kodak PRD film ?
2011-03-03 by designer_craig
John, Thanks for the info, that is exactly what I was thinking but will most likely use some aluminum tubing for the drum. With the size and cost of memory
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RepRap 3d DIY printer
2011-03-03 by olmsteadharold
http://reprap.org/wiki/Main_Page you folks will appreciate this a 3d rapid prototyping self replicating 3d printer. Have at it!
Re: Kodak PRD film ?
2011-03-03 by jmelson2
... Just to give a little more specific answers to your questions: I made the drum out of Plexiglas as I had planned to make it a transparency scanner as well
Re: Kodak PRD film ?
2011-03-03 by jmelson2
... Well, I wouldn t call it sepia , but somebody else might call it that. But, there is more redness than sepia. I am REALLY sure it happens during the
Re: Kodak PRD film ?
2011-03-03 by designer_craig
John, I wouldn t think the fixer would cause the emulsion to turn pink. Could it be just the color of the base stock, I have seen tinted base stock before but
Re: First CNC milled board
2011-03-03 by designer_craig
I have the cut rate fairly low so it took 16 minutes for the top side and 25 minutes for the bottom side. For some reason there were a lot of small cuts on
Re: [Homebrew_PCBs] First CNC milled board
2011-03-03 by Erik Knise
Craig, That looks amazing. How long did it take for the mill to do it s thing? ... Erik L. Knise Pacific Shipping Company Seattle, WA [Non-text portions of
Kodak PRD film ?
2011-03-03 by Jon Elson
Hello, I just got a box of Kodak Polychrome recording film PRD on eBay for a steal. probably $100+ of silver in it, for $9.99 plus postage. I built a laser
First CNC milled board
2011-03-03 by designer_craig
I did my first CNC milled PWB today. It came out great and far exceeding my expectations. The board is a little 3 x 2 solar panel controller for solar
Re: [Homebrew_PCBs] Toner Transfer Method questions
2011-03-02 by Donald H Locker
1. I don t use thin boards, so I can t answer for sure, but thinner boards should take a little less temperature-pressure-time. There is less mass to absorb
Toner Transfer Method questions
2011-03-02 by Randy S.
Hi all .. just some generic questions .. If they have been asked already .. apologies. I use the iron on method for now. Flat on the workpiece for a couple
Re: [Homebrew_PCBs] Re: Question for the chemistry majors !!
2011-03-01 by Randy S.
yeah .. we will see .. as I use the mix and it gets stronger and greener I guess .. its supposed to work better .. and there are ways to test and titrate the
Re: [Homebrew_PCBs] Re: Question for the chemistry majors !!
2011-03-01 by Jim Tonne
Randy: You took the words out of my mouth ! Nicely stated. The questions seem to revolve around what strength of each of the components. Pouring this stuff
Re: [Homebrew_PCBs] Re: Question for the chemistry majors !!
2011-03-01 by Harvey White
... I m willing to be wrong. The solution I made up was 3%, mixed 4 parts to 1 part with the commonly available muriatic acid used for concrete cleaning.
Re: [Homebrew_PCBs] carbide sharpener
2011-03-01 by Brian Symons
Small drills for Machining or Jewellery use are sometimes sharpened with what they call a Wish Bone Sharpener. This is a low tech device with wheels that rubs
Re: [Homebrew_PCBs] Re: Question for the chemistry majors !!
2011-03-01 by Randy S.
Running low on hard drive space or something ?? Do you happen to be a moderator? I would rather be a lonely individual , yadayada ... Then one that has to
Re: [Homebrew_PCBs] Re: Question for the chemistry majors !!
2011-03-01 by Randy S.
LOL @ NOT a chemistry major Well .. still good info .. I will hit up the beauty supply stores .. or a salon perhaps .. but I suspect the price will be higher
Re: [Homebrew_PCBs] Re: Question for the chemistry majors !!
2011-03-01 by Roland F. Harriston
To All: I ve been etching PCB s with muriatic acid (20 Baume, 31.45 % hydrochloric acid) that I purchase from a local supermarket, sold for cleaning swimming
Re: [Homebrew_PCBs] Re: Question for the chemistry majors !!
2011-03-01 by mlerman@ix.netcom.com
I m using 40 Vol, which I get at a Beauty Supply store. Best I can tell it s 12% H2O2, but that s very unclear. Anyway, using it 1:1 with muriatic acid (HCL)
Re: [Homebrew_PCBs] Re: Question for the chemistry majors !!
2011-03-01 by Matthew Andrews
... Are you sure that s correct? this site(http://www.using-hydrogen-peroxide.com/hairdressing-peroxide.html) indicates that 30Vol is 9% and that the 3% you
Re: [Homebrew_PCBs] Re: Question for the chemistry majors !!
2011-02-28 by Randy S.
thats what I am using now .. the 3% .. was just looking at the 30% based on JRod s comments.. Randy ________________________________ From: Harvey White
Re: [Homebrew_PCBs] Re: Question for the chemistry majors !!
2011-02-28 by Harvey White
... It won t be as dangerous as you think. Use 30 VOL (produces 30 times more oxygen) H202, That s 3% Hydrogen Peroxide. You get it at drugstores and the
Re: [Homebrew_PCBs] carbide sharpener
2011-02-28 by lists
In article , ... Probably but not just an arm and a leg but your arse as well! -- Stuart Winsor Midland RISC OS show - Sat July 9th
Re: [Homebrew_PCBs] Re: Question for the chemistry majors !!
2011-02-28 by Randy S.
Theres another link on that page .. http://members.optusnet.com.au/~eseychell/PCB/etching_CuCl/index.html Titled : Etching with Air Regenerated Acid Cupric
Re: [Homebrew_PCBs] Re: Question for the chemistry majors !!
2011-02-28 by Randy S.
Enjoying the info on that website immensely .. thanks .. I was thinking about using an aquarium heater to heat the solution.. But I guess I would have to
Re: [Homebrew_PCBs] Re: Question for the chemistry majors !!
2011-02-28 by Norm
... Beauty shop/professional hairdresser suppliers carry it. As to disposal, bubbling air through it, or adding a bit of HCl seem to rejuvenate it - no need to
Re: [Homebrew_PCBs] Re: Question for the chemistry majors !!
2011-02-28 by Randy S.
Was looking at the MSDS for the 30% h2o2 .. yikes .. This etching boards can be dangerous stuff .. lol Randy ________________________________ From: jurod81
Re: [Homebrew_PCBs] Re: Question for the chemistry majors !!
2011-02-28 by john tabberer
Hi Randy, I understand the Hydrogen peroxide oxidises the copper surface, and the HCL disolves the oxide, leaving the surface clean and ready to be oxidised
Re: [Homebrew_PCBs] Re: Question for the chemistry majors !!
2011-02-28 by Randy S.
Thanks JRod .. Well for not being a chemistry major. Looks like the most detailed answer thus far. Where do I purchase 30% H2O2 ? If the main ingredient in the
Re: Question for the chemistry majors !!
2011-02-28 by jurod81
Hey Randy- I will preface this with - I am not a chemistry major, but I do know a bit of chemistry (more organic than inorganic). To answer the original
RE: [Homebrew_PCBs] New file uploaded to Homebrew_PCBs
2011-02-28 by Boman33
Jeff, Even if the pictures match, they are not necessary the same. The design is like to have been copied several times by different Chinese companies, often
carbide sharpener
2011-02-28 by cristianbip
Is there, somewhere, a small sharpener for carbide tools? I mean only for the 1/8 shrank, with a microscope and some precise adjustement. Cristian
RE: [Homebrew_PCBs] New file uploaded to Homebrew_PCBs
2011-02-28 by Jeff Heiss
The exhaust port you put on confirms yours is the same as the Harbor Freight/Ebay ones. Out of curiosity would you be able to measure the rpm on yours? Even
RE: [Homebrew_PCBs] New file uploaded to Homebrew_PCBs
2011-02-28 by Boman33
Remember that I bought mine at least 15 years ago but it looks the same. I never measured the RPM but keep in mind that RPM will also depend on air pressure
RE: [Homebrew_PCBs] New file uploaded to Homebrew_PCBs
2011-02-28 by Jeff Heiss
Is the drill you used the one sold at Harbor Freight and Ebay for about $25? If so, I have the same drill and I have two comments on it. First it uses a lot
Re: Question for the chemistry majors !!
2011-02-28 by AlienRelics
OK, we ve drifted off topic for the group and there are 17 pages of quadruple spaced reply attached. Please take the diving discussion off list. Steve
Re: PCB drilling vacuum table ??
2011-02-28 by designer_craig
Update: After some more reading I went out to the shop and sanded some additonal material off the slick MDF surface. That really helped and it works a lot
New file uploaded to Homebrew_PCBs
2011-02-27 by Homebrew_PCBs@yahoogroups.com
Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the Homebrew_PCBs group. File :
Re: [Homebrew_PCBs] Question for the chemistry majors !!
2011-02-27 by Trevor Matthews
From the little I remember from electro-chemistry, the gas produced is hydrogen. Certainly in the case of using Sulphuric acid, the gas released is
Re: [Homebrew_PCBs] Question for the chemistry majors !!
2011-02-27 by Randy S.
thanks .. appreciate the reply .. :) ... From: Ryan Bray To: Homebrew_PCBs@yahoogroups.com Cc: Randy S. Sent: Sat,
Re: [Homebrew_PCBs] Question for the chemistry majors !!
2011-02-27 by Randy S.
HUH? I dont get it ________________________________ From: Jim Tonne To: Homebrew_PCBs@yahoogroups.com Sent: Sat, February 26, 2011 6:57:18
Re: [Homebrew_PCBs] Question for the chemistry majors !!
2011-02-27 by Randy S.
Well there wouldnt be any point in teaching a dead dog to roll over and play dead? ________________________________ From: Donald H Locker
Re: [Homebrew_PCBs] Question for the chemistry majors !!
2011-02-27 by Ryan Bray
you would likely get chlorine gas and more water if I remember my first year chemistry from engineering at all. ... [Non-text portions of this message have
Re: [Homebrew_PCBs] Question for the chemistry majors !!
2011-02-26 by Jim Tonne
Randy: Earlier, when I saw all of those big words , I was tempted to suggest that this forum is supposed to be conducted in the English language but decided
Re: [Homebrew_PCBs] Question for the chemistry majors !!
2011-02-26 by Donald H Locker
You can t teach a dead dog new tricks. All other dogs may or not be educable. As for me, I ve got a big print job due tomorrow for the ballet company. No
RE: [Homebrew_PCBs] PCB Drilling High RPM
2011-02-26 by Boman33
Yes, that is the type I am referring to in the URL below. Remember that I bought mine over 15 years ago so I obviously cannot comment on the quality of the
Re: [Homebrew_PCBs] Question for the chemistry majors !!
2011-02-26 by Randy S.
Wow .. its fun updating my own posts .. lol I guess I have to be careful what I wish for . ( I knew I should have taken chemistry comment ) I went to you tube
Re: [Homebrew_PCBs] Question for the chemistry majors !!
2011-02-26 by Randy S.
hmmm no replies yet .. I did find this though .. * If the concentration of a particular ion is high, it will be selected to be discharged even though it is
Re: [Homebrew_PCBs] PCB Drilling High RPM
2011-02-26 by Charles R. Patton
I think he is talking about a die grinder as in: http://www.harborfreight.com/1-8-eighth-inch-air-micro-die-grinder-47869.html currently only $22.99. I have
Question for the chemistry majors !!
2011-02-26 by Randy S.
I m not talking about Chemistry.com here either ..lol Ok .. using muriatic acid .. with the hydrochloric acid in it mixed with peroxide. I looked a chemelec s