Re: [Homebrew_PCBs] Re: how can i prevent corosion?
2003-12-03 by Stefan Trethan
... I was told that curing the epoxy in an oven at 80 degree or so improves the strength, even if it is hardening only by mixing the 2 components too. The
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Re: [Homebrew_PCBs] Re: how can i prevent corosion?
2003-12-03 by Stuart Winsor
In article , ... OK, now, the Epoxy I normally use, trade name Araldite, is two part and the warning on the
Re: [Homebrew_PCBs] Re: how can i prevent corosion?
2003-12-03 by mpdickens
... Any resins that are mixed with an amine are epoxies. Bisphenol-A is an amine. If your not having to autoclave it, then the 70% aliphatic amines are mixed
Re: [Homebrew_PCBs] Re: how can i prevent corosion?
2003-12-03 by Stefan Trethan
... all the epoxys here for model building etc. don t need an autoclave. They are calles epoxy, and there is also stuff called polyester resin, which i
Re: [Homebrew_PCBs] Re: how can i prevent corosion?
2003-12-03 by Adam Seychell
... Then in that case most of the retailers have got the labeling wrong. If they call polyester resin Epoxy then what do they call polyester resin ? A shop I
Re: [Homebrew_PCBs] Re: how can i prevent corosion?
2003-12-03 by mpdickens
... Your right. You nailed me ;) Most of the stuff they sell in stores that is labeled Epoxy is really polyester resin. In fact, true epoxies have to be
Re: [Homebrew_PCBs] Re: how can i prevent corosion?
2003-12-03 by mpdickens
... Your right. You nailed me ;) Most of the stuff they sell in stores that is labeled Epoxy is really polyester resin. In fact, true epoxies have to be
RE: [Homebrew_PCBs] Homebrew Tool Changer
2003-12-03 by Dave Hylands
Here s a set of tool changer plans for a Sherline Headstock: http://home.insightbb.com/~joevicar3/default.htm It uses a single air cylinder - no motors. --
Re: [Homebrew_PCBs] Homebrew Tool Changer
2003-12-03 by mpdickens
... Hello Bengt, This is robotics and robotics is as much an art as a science. Further, robotics can provide humbling experiences as well as be exceptionally
Re: how can i prevent corosion?
2003-12-03 by Steve
... I think you ve said this before, but I ve never heard that. And epoxy resin is always listed separately from polyester resin. Like this site:
Re: [Homebrew_PCBs] Re: how can i prevent corosion?
2003-12-02 by mpdickens
... circuit if I can find an epoxy encapsulant that has very little ... Polyester resin (Epoxy is the trade name for polyester resin) has an extremely low
Homebrew Tool Changer
2003-12-02 by bsjoelund
Hi, I´m looking for small/miniature tool changer for PCB drilling. Any links - pictures - ideas ?? Bengt
Re: New file uploaded to Homebrew_PCBs
2003-12-02 by roel_cnc
depending on the strengt of the chems you should ad the fallue from sulfuric acid (even car battery acid is per country different) instead of a volumic messure
Re: how can i prevent corosion?
2003-12-02 by Steve
... The epoxy itself can dissipate the heat as long as you design enough surface area between the heat sink and the epoxy, and from the epoxy to the water.
Low leakage coatings? Re: how can i prevent corosion?
2003-12-02 by Steve
Re: filled with dry nitrogen and sealed ... level. ... Yes, but my case costs will go up drastically. The 2nd solution would cause less problems as far as
Low leakage coatings? Re: how can i prevent corosion?
2003-12-02 by Steve
... solder it ... That is essentially what I end up doing now, and was hoping to find something more elegant and professional looking. Steve
Re: [Homebrew_PCBs] Re: how can i prevent corosion?
2003-12-02 by mpdickens
... Heat was never an issue when the box is in the water. The entire box acted as a heat sink. Hoever, we also did it like this when devices had heat issues
Re: [Homebrew_PCBs] Low leakage coatings? Re: how can i prevent corosion?
2003-12-02 by Russell Shaw
... With a couple of extra screws thru the center, the pressure would be less problem. On the next design, the high impedance circuit could be confined to a
Re: [Homebrew_PCBs] Low leakage coatings? Re: how can i prevent corosion?
2003-12-02 by Leon Heller
... From: Steve To: Sent: Monday, December 01, 2003 11:29 PM Subject: [Homebrew_PCBs] Low leakage
Re: [Homebrew_PCBs] Re: how can i prevent corosion?
2003-12-02 by Ron Amundson
... I ve used epoxy too, and have filled potting boxes with it. However it can raise havoc with heat producing parts, as well as creating additional thermal
Exposing copper with laser engraver/cutter
2003-12-02 by javaguy11111
I have wondered if it would be possible to use a laser engraver/cutter to make printed circuit boards. The method I am thinking of is not direct removal of the
Re: [Homebrew_PCBs] Re: how can i prevent corosion?
2003-12-02 by Adam Seychell
Just one note: I found methylene chloride paint stripper does excellent job removing epoxy, unfortunately that includes the FR4 epoxy. After several hours it
Re: [Homebrew_PCBs] Low leakage coatings? Re: how can i prevent corosion?
2003-12-02 by Ron Amundson
That blocks interference but it can actually make leakage worse as the path to ground is shorter. No, haven t tried Teflon. Is it that good an insulator? What
Re: [Homebrew_PCBs] Re: how can i prevent corosion?
2003-12-02 by mpdickens
... Using a disposable brush, coat the board in 1 hour epoxy. The coat does not have to be that thick: You just cover the board (And the parts on the board if
Low leakage coatings? Re: how can i prevent corosion?
2003-12-02 by Steve
... I was hoping for something that would allow repair and that would not require hermetically sealed pressure tested enclosures. Otherwise those are not bad
Re: [Homebrew_PCBs] Low leakage coatings? Re: how can i prevent corosion?
2003-12-02 by Russell Shaw
... You could put the pcb in a sealed container with dry nitrogen or normal air with moisture-absorbing gel.
Low leakage coatings? Re: how can i prevent corosion?
2003-12-02 by Steve
... Exposed conductors mean they are exposed to humid or dusty air, and the surface of the fiberglass substrate will build up contaminants and humidity. Steve
Re: [Homebrew_PCBs] Low leakage coatings? Re: how can i prevent corosion?
2003-12-02 by Adam Seychell
... To prevent any possibility of the PCB being coated in something you don t want it coated with. e.g. microscopic water condensation or traces of dried
OT: Soldering LCDs
2003-12-02 by Adam Bradley
Hi! After a short hiatus (house painting, travel etc) I m back trying to get my LCD to work! After soldering a couple of jumpers on a board with some pitted
Re: [Homebrew_PCBs] Low leakage coatings? Re: how can i prevent corosion?
2003-12-02 by Russell Shaw
... Why do you need *any* coating on the pcb?
Re: [Homebrew_PCBs] Re: how can i prevent corosion?
2003-12-01 by Ron Amundson
Here is yet another approach. Volatile corrosion inhibitors. We ve tried them in nasty outdoor environments and they are just amazing. The only disadvantage is
Low leakage coatings? Re: how can i prevent corosion?
2003-12-01 by Steve
... That blocks interference but it can actually make leakage worse as the path to ground is shorter. No, haven t tried Teflon. Is it that good an insulator?
File - monthly.txt
2003-12-01 by Homebrew_PCBs@yahoogroups.com
Monthly Reminder, please read: Subject lines: Remember to change the subject line if you are straying from the original thread. Please change the subject line
Re: [Homebrew_PCBs] Low leakage coatings? Re: how can i prevent corosion?
2003-12-01 by Ron Amundson
Its very difficult to even get that level with solder mask, so say nothing of flux. I ve tried different coatings from Dupont, however our assembly techniques
Re: [Homebrew_PCBs] Low leakage coatings? Re: how can i prevent corosion?
2003-12-01 by Leon Heller
... From: Steve To: Sent: Monday, December 01, 2003 6:28 PM Subject: [Homebrew_PCBs] Low leakage
Low leakage coatings? Re: how can i prevent corosion?
2003-12-01 by Steve
Does anyone here have experience and suggestions for low-leakage coatings? I ve got some circuits in mind that in the past I ve done dead-bug style to avoid
New file uploaded to Homebrew_PCBs
2003-12-01 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] Re: how can i prevent corosion?
2003-12-01 by Stefan Trethan
... I just want to say no need for any dangerous chemicals if a simple acrylic paint will do after soldering or a paint with colophony if you need to protect
Re: [Homebrew_PCBs] how can i prevent corosion?
2003-12-01 by Ted Huntington
I bought a clear spray acrylic/epoxy, but I am thinking now that clear nail polish might be useful too for PCBs with components that can not be covered with
Re: [Homebrew_PCBs] spray Etching of TT
2003-12-01 by mpdickens
... You will end up wearing the acid. Further, when pouring /measuring/ dispensing any chemical (Acid or not...), DO NOT DO IT at eye level and always wear eye
Re: [Homebrew_PCBs] Re: how can i prevent corosion?
2003-12-01 by mpdickens
... Not as nasty as: 1.) Gasoline which is a known carcinogen 2.) Kerosine which is a know cacinogen 3.) Methlyine Chloride which is a known carcinogin and
Re: [Homebrew_PCBs] Re: how can i prevent corosion?
2003-12-01 by Stefan Trethan
... i see
Re: [Homebrew_PCBs] Re: how can i prevent corosion?
2003-12-01 by Russell Shaw
... The dilution action can release heat, so a small drop of water in acid can make a very high temperature and pressure explosion or splash when the water
Re: [Homebrew_PCBs] spray Etching of TT
2003-12-01 by Stefan Trethan
... yes. only sometimes on the edges i had a bad spot (i have a board outline trace most time which likes to get off where i start peeling the paper) ... I
Re: [Homebrew_PCBs] Re: how can i prevent corosion?
2003-12-01 by Stefan Trethan
On Sun, 30 Nov 2003 23:54:21 -0800 (PST), mpdickens ... Well, that sounds easy.. BUT thiourea ia pretty nasty stuff! It is known to produce
Re: [Homebrew_PCBs]OT Eagle vs Protel
2003-12-01 by Leon Heller
Leon Heller, G1HSM Email: aqzf13@dsl.pipex.com http://www.geocities.com/leon_heller ... From: Ron Amundson To:
Re: [Homebrew_PCBs] Re: how can i prevent corosion?
2003-12-01 by mpdickens
I ve posted this mixture before: Mix 3.8 grams of Stannous chloride into 1 liter of distilled water that is at 80 to 120 degrees fahrenheit in temperature.
Re: Q: Drilling PCBs
2003-12-01 by Steve
... nt/ ... ALWAYS used ... will go dull in ... hundreds of ... I concur. Sharp, sharp, sharp. I have a drill bit resharpener for my regular bits, but I don t
Re: Why I don't like the Photos folder
2003-12-01 by Steve
... create a ... almost ... They did that for a selfish reason- you can buy prints of those images, the high res is only for them to print, and only shows you
Re: [Homebrew_PCBs]OT Eagle vs Protel
2003-12-01 by Ron Amundson
Hmm, not sure about a free tool. I know that router solutions product does that easily, but I don t know if the demo has that feature enable. I ve also used