Re: Cutting PCBs
2011-05-04 by Andrew
I know I ve said it before -- but then again, I don t think anyone has actually listened! Before investing in a $300 tablesaw or a shear of doubtful capacity,
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Re: [Homebrew_PCBs] Re: Oxygen regeneration of CuCl2
2011-05-04 by Andrew Leech
... That to me sounds like you don t have enough copper in the solution yet. cucl2 etching relies on an interesting reaction where one form of copper ion in
Re: [Homebrew_PCBs] Re: Cutting PCBs
2011-05-04 by Alessio Sangalli
... http://www.manoweb.com/alesan/temp/test-hotlink.html bye as
Re: [Homebrew_PCBs] Oxygen regeneration of CuCl2
2011-05-04 by Andrew Leech
... I ve had the same brew of cucl2 for about 5 years now, and haven t found I ever needed to add h2o2. The only advantage of h2o2 would be very quickly regen
Re: Cutting PCBs
2011-05-04 by tda7000
That s different, he s talking about when people hotlink from their own web-page. In that case the referrer will be different and you ll get an error message
Re: [Homebrew_PCBs] Cutting PCBs
2011-05-04 by Alessio Sangalli
... I do not understand :) what if I simply use this URL: http://www.delorie.com/pcb/tmp/grizzly-shear.jpg bye as
Re: Oxygen regeneration of CuCl2
2011-05-04 by tda7000
That s interesting... mine didn t actually go brown, but it didn t seem to work after the initial use either. Maybe I have a different problem and that s why
Re: [Homebrew_PCBs] Cutting PCBs
2011-05-04 by DJ Delorie
... Those are trimmings - I did *not* sand those! When I use a sanding block to smooth the edges, it s nearly indistinguishable from a fab-milled edge. ...
Re: Cutting PCBs
2011-05-04 by tda7000
I use a flat bastard file to clean up the edges of mine. Makes them perfectly smooth and cuts fast too. Maybe a little too fast if you don t watch out! (Note,
Re: [Homebrew_PCBs] Cutting PCBs
2011-05-04 by Alessio Sangalli
... It seems perfectly acceptable to me. Of course you give a quick sand/file after to smooth the edges. Do you *really* copyright those pictures? Why not
Re: [Homebrew_PCBs] Hydrogen Peroxide Source
2011-05-04 by Alessio Sangalli
... Yes I would not want to go in a hidroponics store, I guess the police collects data about anybody that goes there... :( bye as
Re: [Homebrew_PCBs] Re: Oxygen regeneration of CuCl2
2011-05-04 by DJ Delorie
... There s a row of small holes in the block attached to the air hose. ... I heat my solution so it etches faster ;-) ... It s not about dissolved oxygen,
Re: [Homebrew_PCBs] Cutting PCBs
2011-05-04 by DJ Delorie
I usually sand the edges just to get them smooth, but here s a photo of some of the trimming still under the 12 shear:
Re: [Homebrew_PCBs] Hydrogen Peroxide Source
2011-05-04 by Erik Knise
The local pool supply stores in my area stock it too. It s actually pretty cheap. The ingredients listed are usually just hydrogen peroxide and water. They
Hydrogen Peroxide Source
2011-05-04 by designer_craig
Fyi, Was thinking about growing some hydroponic tomatoes this year and took a trip over to a local hydroponic supplier. Hand t realized how big an industry
Re: [Homebrew_PCBs] Re: Cutting PCBs
2011-05-04 by toddroberts2001@aol.com
About 3-4 years ago I picked up one of those small table-top Micro-Mark table saws with a 3 1/4 carbide blade. Does a great job for me and easy to cut small
Re: Cutting PCBs
2011-05-04 by designer_craig
I would think that Grizzly would work fine. I have an old 36 Famco shear that I use all the time. Wouldn t use it on .125 material but it should do fine.
Re: Oxygen regeneration of CuCl2
2011-05-04 by Dave
... Part of the trick is to maximize the area of interaction, which means that a LOT of tiny bubbles are better than big bubbles. Thus, think of the design of
Re: [Homebrew_PCBs] Re: Cutting PCBs
2011-05-04 by john tabberer
I have a similar guilotine, and it does cut FR4, but the edge is not smooth afterwards. I used to sand the edges on a linnisher / Table mounted belt sander.
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2011-05-04 by muhammad rizqi
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Re: Cutting PCBs
2011-05-04 by tda7000
Probably, though how long the blade will last on FR4 is another question... It will give rough edges too, you will need to sand file them if you want something
Re: [Homebrew_PCBs] Re: Cutting PCBs
2011-05-04 by Tom Biery
are you saying this will work? http://www.grizzly.com/products/8-Mini-Shear-Brake/T23109 if so i ll get one please advise ________________________________
Re: [Homebrew_PCBs] Re: Cutting PCBs
2011-05-04 by Alessio Sangalli
... No, with this thicker PCB I have that takes A LOT OF EFFORT (it is the PCB that I use when I make power supplies to deliver tens of amps). Milling machines
Re: Cutting PCBs
2011-05-04 by tda7000
I don t think you will get a good and precise cut without a milling machine or saw (and I don t mean a hacksaw) I use score-and-snap method, edges are a bit
Re: [Homebrew_PCBs] Cutting PCBs
2011-05-04 by alesan
How precise is a cut with a shear like that? Pictures welcome ;) Bye as - - - - -
Re: [Homebrew_PCBs] Cutting PCBs
2011-05-04 by DJ Delorie
I think any small shear will work fine for FR4. I got a 12 grizzly one but others here have the 8 harbor freight model.
Re: [Homebrew_PCBs] Oxygen regeneration of CuCl2
2011-05-04 by DJ Delorie
I use a small air bubbler to regenerate, seems to work just fine for me. I turn on the air at the start of the process, so it s running for an hour or so
Re: Oxygen regeneration of CuCl2
2011-05-03 by tda7000
He s using an air compressor, not some tiny aquarium pump. It s all there in the comments where I asked him the same question ;)
Cutting PCBs
2011-05-03 by Alessio Sangalli
Hi, I tried to use this wet table saw, with the thin diamond blade that was discussed several times on this list, and the results are extremely disappointing.
Re: [Homebrew_PCBs] Re: Oxygen regeneration of CuCl2
2011-05-03 by Alessio Sangalli
... I do not understand anything what is being used there... bye as
Re: [Homebrew_PCBs] Oxygen regeneration of CuCl2
2011-05-03 by Alessio Sangalli
... Make a video!!! bye as
Re: Oxygen regeneration of CuCl2
2011-05-03 by tda7000
I tried air bubbling too (with am aquarium pump) and got nothing. Then I found this: http://www.youtube.com/watch?v=yT5SdY7nlu8 I think you really need
Re: [Homebrew_PCBs] Oxygen regeneration of CuCl2
2011-05-03 by Jim
... This used etch is returned to the jar.
Re: [Homebrew_PCBs] Oxygen regeneration of CuCl2
2011-05-03 by Jim
Hi Mark My starting mixture was made with 2 parts of 3%H2O2 and 1 part of 29% HCl. I collected the used etch in a half gallon mason jar with scrap copper in
Re: [Homebrew_PCBs] Oxygen regeneration of CuCl2
2011-05-03 by Mark Lerman
Hi Jim, Are you using this at room temperature? Did you make your CuCl2 with H2O2/HCl? If so, what was your starting mixture? Thanks. Mark
Re: [Homebrew_PCBs] Oxygen regeneration of CuCl2
2011-05-03 by Jim
Hi Mark I use 27% H2O2 bought at the pool supply store to rejuvenate my etch. I use ~7 ml H2O2 27% per ~300 ml of CuC12. I tried air bubbling and I was not
Re: Oxygen regeneration of CuCl2
2011-05-03 by javaguy11111
Interesting idea. Especially if you have access to an acetylene torch set.
[Homebrew_PCBs] Oxygen regeneration of CuCl2
2011-05-03 by Mark Lerman
If I add 3% H2O2 to regenerate my etchant, I m adding a lot of water to the mix, so I m wondering if there s any advantage or disadvantage in bubbling oxygen
Re: [Homebrew_PCBs] Test Targets
2011-05-02 by DJ Delorie
... You re welcome! Let us know if you succeed at any :-)
Re: Newbie + SMD, prototyping?
2011-05-02 by dubob4432
my first boards were 0805 & 32-tqfp nearly a year ago using solder paste w/ a kapton stencil on a hotplate. my latest is 4x4x0.9mm (QFN) and 3x3x.9mm LGA
RE: [Homebrew_PCBs] Test Targets
2011-05-02 by Boman33
DJ, The spiral patterns are very nice to qualify the process once a track & space has been preliminary selected. I saved your link if I happen to need it in
Re: [Homebrew_PCBs] Newbie + SMD, prototyping?
2011-05-02 by DJ Delorie
... Just did one today with an IRON. Switched to my *biggest* tip (0.07 chisel) to make it easier. Worked perfectly. 0.5mm pitch too :-) Here s the board:
Re: [Homebrew_PCBs] Newbie + SMD, prototyping?
2011-05-02 by Aaron Turner
Thanks everyone for the feedback! I m beginning to hear more and more about the hot-plate method of SMD soldering... is that something that s viable for a
Re: [Homebrew_PCBs] Test Targets
2011-05-02 by DJ Delorie
... IIRC Stouffer (the step gauge people) also have a resolution test gauge, which is (in theory) a perfect pattern to test UV exposure resolution with.
Re: [Homebrew_PCBs] Newbie + SMD, prototyping?
2011-05-02 by Tom Biery
The current board I am working on has about 200 connections and with SMD components I can put the board together very quickly and accuratly. I was able to
Re: [Homebrew_PCBs] Newbie + SMD, prototyping?
2011-05-02 by Tom Biery
Folks, I have lots of youtube videos on this subjects please check them out, I d be happy to answer any questions you have thanks and subscribe... Homebrewers
Re: Newbie + SMD, prototyping?
2011-05-02 by dubob4432
not trying to push you away from smd as i love it, but have you looked at the recom r-78xx line? http://www.recom-power.com/ same basic footprint as a 780x
Re: Test Targets
2011-05-01 by Bob
Hi Betho, Thankyou for sharing with the group. The test image is a good one. It shows that my printer does much better horizontally than vertically. I
Re: [Homebrew_PCBs] Newbie + SMD, prototyping?
2011-05-01 by Ryan Bray
As someone who recently converted to nearly all SMD boards, I find it great as: I don t have to drill as many holes. You have a much larger selection of parts
Test Targets
2011-05-01 by Boman33
With all this ongoing work on testing printers and procedures, I added a Test Target for PCB traces to my old US Air Force 1951 standard test target. All the