Sprayer pressure - pumps
2005-03-15 by Adam Seychell
... I ve spent six months (spare time project) building a spray etcher. From what I ve learned, about spray nozzles and spray pumps is they need at least 1 bar
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Re: [Homebrew_PCBs] Pumping etchant with cheap pumps
2005-03-15 by Stefan Trethan
... oh, then i mixed the threads up, sorry. As said, the eheim aquarium pump is the same, ceramic shaft, no metals. we have a second report of such a pump now
Pumping etchant with cheap pumps
2005-03-15 by Steve
Actually, I -was- only talking about pumping the etchant around, not spraying it. I m thinking of something just to get the etchant moving. Steve Greenfield
Re: [Homebrew_PCBs] Re: titanium grades
2005-03-15 by Stefan Trethan
... 1.5meters is 0.15bar, while 1bar is more or less the lower, lower limit of reasonable spray etching pressure. (and the 1.5 meters is usually at almost zero
Re: [Fwd: Re: [Homebrew_PCBs] Re: bubbler - more air for bigger bubbles]]
2005-03-15 by uhmgawa
... Oil lubricated compressors can introduce oil but inexpensive filters are exist for common applications such as spray painting which can be used to remove
Re: [Fwd: Re: [Homebrew_PCBs] Re: bubbler - more air for bigger bubbles]
2005-03-15 by uhmgawa
... Oil lubricated compressors can introduce oil but inexpensive filters are exist for common applications such as spray painting which can be used to remove
[Fwd: Re: [Homebrew_PCBs] Re:Sprayer pressure]
2005-03-15 by uhmgawa
Resend, was dropped.. ... Subject: Re: [Homebrew_PCBs] Re:Sprayer pressure Date: Mon, 14 Mar 2005 09:10:13 -0500 From: uhmgawa To:
[Fwd: Re: [Homebrew_PCBs] Re: bubbler - more air for bigger bubbles]
2005-03-15 by uhmgawa
Resend, was dropped.. ... Subject: Re: [Homebrew_PCBs] Re: bubbler - more air for bigger bubbles Date: Wed, 09 Mar 2005 16:58:34 -0500 From: uhmgawa
Re: [Fwd: Re: [Homebrew_PCBs] Re:Sprayer pressure]
2005-03-15 by Stefan Trethan
... Had the same idea a few days ago. However, will try rotational etcher first. Nozzles need quite a lot of volume. ST
Re: [Fwd: Re: [Homebrew_PCBs] Re: bubbler - more air for bigger bubbles]
2005-03-15 by Stefan Trethan
... A normal compressor intoduces oil in the airstream and can not be run closed-loop because of metal parts. I have set up a small fridge compressure, small
Re: [Homebrew_PCBs] Re: titanium grades
2005-03-15 by Lez
... I know nothing about this thread except, I have a pond pump with ceramic shaft magnet, the magnet is in a plastic jacket btw, it is a 12mm diameter magnet,
Re: [Homebrew_PCBs] Re: titanium grades
2005-03-14 by Norman Stewart
Steve wrote: Anyone know what ... Not sure about the materials, but Harbor Freight often has their smallest (~150 GPH) on sale for $7.00 or so. Might be worth
Pump driven by piezo, no moving parts in valve
2005-03-14 by Steve
http://www.designnews.com/article/CA507791.html Uses a flapperless valve design developed by Nikola Tesla. Interesting. Piezo buzzers are cheap, and can be
Re: titanium grades
2005-03-14 by Steve
... out of? ... pumps ... Depends on brand as all that I ve taken apart had what looked like stainless steel or chromed shafts. I ve been picking up old ones
Re: [Homebrew_PCBs] Re: titanium grades
2005-03-14 by Stefan Trethan
... That s interesting. The only metal object exposed to water in Eheim aquarium/fountain pumps is the magnet, they have a ceramic shaft. But then, the
Re: titanium grades
2005-03-14 by Steve
... Excellent. I added it to the links, remember you can add to Links, too. Also this link Stefan uploaded: Cole-Parmer Chemical Compatibility Lists loads of
Re: [Homebrew_PCBs] Re:Sprayer pressure
2005-03-14 by Stefan Trethan
Thanks for your reply Richard. We can not assume 2.5cm filled height, no. There are holes on the bottom of the tube, to let etchant in, and if there is more
Re:Sprayer pressure
2005-03-14 by RMustakos
... Stephan Just as a quick estimate, your not producing NO pressure, just .28 bar. :^) You need to generate at least (1000/2.5) = 400 Gs to make 2.5 cm
Re: [Homebrew_PCBs] Links for gerber viewers
2005-03-13 by Adam Seychell
... Here are the main Gerber programs I know of. Search google for link. GCPrevue GerbTool Gerbv ViewMate CAM350 Then of course there is my gerb2tif ultility
Re: [Homebrew_PCBs] Sprayer pressure
2005-03-13 by Stefan Trethan
ok, time for maths. according to a formula i found on the web a 50mm dia tube spinning at 1000rpm experiences 274m/s^2 or 28g on the inside edge. so if there
[Homebrew_PCBs] Sprayer things
2005-03-13 by Stefan Trethan
hi, I m going to buy 5mm Lexan to make the tank, it seems the least prone to shattering and i hope to me able to machine it without pulling my hair out. Please
Re: [Homebrew_PCBs] Sodium Perborate??
2005-03-13 by Stefan Trethan
On Sat, 12 Mar 2005 21:18:13 -0000, jamalzaghal ... No, but according to you can use Sodium
Re: [Homebrew_PCBs] Links for gerber viewers
2005-03-13 by Stefan Trethan
... Yes please do make a folder (in software if there is such a folder already). I suggest GC preview version 8. don t remember why but the newer versions have
Sodium Perborate??
2005-03-12 by jamalzaghal
Hi Everybody, Have you tried Sodium Perborate in place of Hydrogen Peroxide?? Please inform. Cheers.
[Homebrew_PCBs] tank construction plastic (was: titanium grades)
2005-03-12 by Stefan Trethan
On another note, while looking for the ptfe and stuff i ve come across a ebay supplier in Austria that sells various transparent plastic plates at very
Re: [Homebrew_PCBs] titanium grades
2005-03-12 by Dave VanHorn
... Hmmm... I seem to remember, that when we put equipment in at Dole Pineapple, Delrin and stainless steel were the only two materials we could use. That
Links for gerber viewers
2005-03-12 by Rick Collins
I was looking for links to gerber viewers and I see that there are not many here. I also found that it was unclear what catagory they should go in. Perhaps
Re: [Homebrew_PCBs] titanium grades
2005-03-12 by Jason Giglio
... http://www.machinist-materials.com/comparison_table_for_plastics.htm Try this table, it has many parameters for many types of plastic. They also sell this
Re: [Homebrew_PCBs] titanium grades
2005-03-12 by Stefan Trethan
On Sat, 12 Mar 2005 16:33:07 -0000, Leon Heller ... Thanks a lot. I especially like that: It is best to use Delrin with neutral pH aqueous solutions or
Re: [Homebrew_PCBs] titanium grades
2005-03-12 by Leon Heller
... From: Stefan Trethan To: Sent: Saturday, March 12, 2005 3:03 PM Subject: Re: [Homebrew_PCBs]
Re: [Homebrew_PCBs] titanium grades
2005-03-12 by Stefan Trethan
On Sat, 12 Mar 2005 10:54:32 -0500, Dave VanHorn ... ok thanks. ST
Re: [Homebrew_PCBs] titanium grades
2005-03-12 by Dave VanHorn
... AFAIK, delrin is ok.. We had an embarrassing incident with a bearing that was nylon vs delrin, because the engineer in charge insisted on using the
Re: [Homebrew_PCBs] titanium grades
2005-03-12 by Stefan Trethan
On Sat, 12 Mar 2005 10:24:58 -0500, Dave VanHorn ... Yes, i was aware of nylon, i know PE ans PP and PVC are ok with water, and i
Re: [Homebrew_PCBs] titanium grades
2005-03-12 by Dave VanHorn
... You may be aware of this, but some plastics, like nylon, absorb water nicely, and swell.
Re: [Homebrew_PCBs] titanium grades
2005-03-12 by Stefan Trethan
On Sat, 12 Mar 2005 13:57:27 -0000, Leon Heller ... Oh well, that would need a larger diameter. I guess it would be ok if i go with the bigger diameter pipe.
Re: [Homebrew_PCBs] titanium grades
2005-03-12 by Leon Heller
... From: Stefan Trethan To: Sent: Saturday, March 12, 2005 1:40 PM Subject: Re: [Homebrew_PCBs]
Re: [Homebrew_PCBs] titanium grades
2005-03-12 by Stefan Trethan
On Sat, 12 Mar 2005 13:00:28 -0000, Leon Heller ... So no good? I don t think missing 6% of the shaft would be acceptable (as the shaft should stay smooth for
Re: [Homebrew_PCBs] titanium grades
2005-03-12 by Leon Heller
... From: Stefan Trethan To: Sent: Saturday, March 12, 2005 12:05 PM Subject: [Homebrew_PCBs]
titanium grades
2005-03-12 by Stefan Trethan
Hi, say, must i get titanium grade 2 (or 1) for CuCl resistance or is Grade 5 (Ti-6AL-4V) allright? It has 6% Aluminum and 4% Vanadium? in it, will that be a
Re: [Homebrew_PCBs] has anyone worked on the rotary spray etcher?
2005-03-12 by Stefan Trethan
On Sat, 12 Mar 2005 21:40:27 +1100, Tony Smith ... Low rpm is a no-go and hard to get is a no-go too (which the above-mentioned is
RE: [Homebrew_PCBs] has anyone worked on the rotary spray etcher?
2005-03-12 by Tony Smith
... You can get all sorts of non-metal bearing (ball), including ceramic, plastic & glass. From memory, you can get bearings that have glass balls with plastic
Re: [Homebrew_PCBs] Re: board mounting holes
2005-03-12 by Stefan Trethan
On Sat, 12 Mar 2005 02:06:46 -0000, Ben H. Lanmon ... that not quite 1.5mm, but i would expect it to be able to punch it, no? Usually these
Re: board mounting holes
2005-03-12 by Ben H. Lanmon
I am sure that it would other than on problem on the one page it says Max material thickness to be 16ga. In the Manual for it say Max material thickness to be
Re: [Homebrew_PCBs] has anyone worked on the rotary spray etcher?
2005-03-11 by Stefan Trethan
On Sat, 12 Mar 2005 08:03:05 +1000, Brian Clancy ... Ok, i ll remember that. (But i m not sure which is easier, finding those glues
Re: [Homebrew_PCBs] has anyone worked on the rotary spray etcher?
2005-03-11 by Brian Clancy
G day Stefan PTFE can be glued (Haven t done it myself) using Loctite cyanoacrylate glue with a priming fluid. The combination apparently required is- Loctite
Re: [Homebrew_PCBs] board mounting holes
2005-03-11 by Stefan Trethan
On Fri, 11 Mar 2005 16:42:42 -0500, Henry Carl Ott ... I ve once seen a bench mount version that had the dies mounted like a chinese
Re: [Homebrew_PCBs] has anyone worked on the rotary spray etcher?
2005-03-11 by Stefan Trethan
On Fri, 11 Mar 2005 21:38:42 +0100, lists ... good idea. But can t be glued, right? would not be easy to affix a bearing block to the rest of the tank... But
Re: [Homebrew_PCBs] board mounting holes
2005-03-11 by Henry Carl Ott
... I have one of these and it s bigger brother with a bench mount (both roper whitney brand) . Very handy to have around. Makes nice, fast, and neat holes
Re: [Homebrew_PCBs] board mounting holes
2005-03-11 by Leon Heller
... From: Stefan Trethan To: Sent: Friday, March 11, 2005 9:04 PM Subject: [Homebrew_PCBs] board
[Homebrew_PCBs] has anyone worked on the rotary spray etcher?
2005-03-11 by Stefan Trethan
Hi, we discussed that ages ago. Has anyone built one successfully? I think it would be cheap enough to build to solve many uniformity issues by using multiple