Re: Soldermask UV ink/paint/epoxy
2013-03-31 by cillino25
Hi! I m very interested on this too, but I never found the right UV curable white ink..could you please link the product you re using or at least its name? Can
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Re: [Homebrew_PCBs] lye
2013-03-31 by toddroberts2001@...
In a message dated 3/30/2013 5:59:18 P.M. Eastern Daylight Time, bitsyboffin@gmail.com writes: Note that the Aluminium + Sodium Hydroxide reaction is how one
Re: [Homebrew_PCBs] Re: lye
2013-03-30 by Todd F. Carney / K7TFC
Lye ( caustic soda, sodium hydroxide) is available in many forms on eBay, in the United States and elsewhere. Dozens of listings. I don t believe the bit
Re: lye
2013-03-30 by designer_craig
Rick, Lye (Sodium Hydroxide) solution will etch aluminum very well. The trick is not to make the enchant too strong as the reaction is very exothermic and
Re: [Homebrew_PCBs] lye
2013-03-30 by James Sleeman
... Note that the Aluminium + Sodium Hydroxide reaction is how one produces large quantities of hydrogen without time consuming electrolysis.
Re: [Homebrew_PCBs] lye
2013-03-30 by Roland Harriston
Rick: The absence of lye in local stores in my area might be because of local bans. In my area, the sale of aerosol spray paints is restricted. But the stuff
Re: [Homebrew_PCBs] lye
2013-03-30 by Dylan Smith
You can buy it on ebay (at least on ebay UK). Then again, I ve seen hydrofluoric acid on ebay. What could possibly go wrong?
Re: [Homebrew_PCBs] lye
2013-03-30 by Stefan Trethan
It s either the drug makers or the terrorists that spoil our fun. What s the next common household chemical they will take away for our own good, sodium
Re: [Homebrew_PCBs] lye
2013-03-30 by Rick Sparber
I found it at the Ahwatukee Ace Hardware. Rick
Re: [Homebrew_PCBs] lye
2013-03-30 by Roland Harriston
Rick Sparber: Lye crystals have been withdrawn from many markets because they were being used to make illegal drugs and you can no longer purchase lye crystals
RE: [Homebrew_PCBs] lye
2013-03-30 by Rick Sparber
Todd, Oh, it self-heated to way over 120F. I suspect you use a much more dilute mixture. Rick ... From: Homebrew_PCBs@yahoogroups.com
RE: [Homebrew_PCBs] lye
2013-03-30 by Todd F. Carney / K7TFC
I used sodium hydroxide (lye) all the time in an industrial setting to make aluminum lettering plates. The process called for the solution to be heated to 120
Re: [Homebrew_PCBs] lye
2013-03-30 by Kirk McLoren
potassium hydroxide works too. dilution certainly lowers temperature rise, the reaction rate is temperature dependent so it runs away. The hotter it gets the
RE: [Homebrew_PCBs] lye
2013-03-30 by Rick Sparber
Roland, OK, I have read up on it. Back to electro etching with salt water! Damn, lye is nasty stuff. Thanks, Rick ... From: Homebrew_PCBs@yahoogroups.com
Re: [Homebrew_PCBs] lye
2013-03-30 by Rick Sparber
Gloves, eye protection, all done outside. However, I will read up on it more before doing a second try. Thanks, Rick
Re: [Homebrew_PCBs] lye
2013-03-30 by Roland Harriston
Does not matter what the metal is.........sodium hydroxide is nasty stuff. Were you wearing eye protection?? A lot of stores won t carry it anymore in my neck
Re: Soldermask UV ink/paint/epoxy
2013-03-30 by cillino25
Nice job! I ve searched for that for a while, but didn t find the right ink: what is the name of the white UV ink you used? And where did you get it? Thanks!
Re: [Homebrew_PCBs] lye
2013-03-30 by Rick Sparber
Harvey, Brilliant suggestions! Gotta try them all in the next day or two. Thanks, Rick
Re: [Homebrew_PCBs] lye
2013-03-30 by Harvey White
... It s the heat. You can use the transparent (I like transparent here) shelf covering. The one thing of the Martha Stewart brand that I ll every buy.
RE: [Homebrew_PCBs] lye
2013-03-30 by Rick Sparber
How did you protect the back of the aluminum. I tried applying wax but I think it melted off. Also tried electrical tape and it fell off. Maybe the common
RE: [Homebrew_PCBs] lye
2013-03-30 by Rick Sparber
Roland, In this case, I am etching aluminum, not copper. I know that ferric chloride does not do much to aluminum. I chose lye because it was easy to find at
Re: [Homebrew_PCBs] lye
2013-03-30 by Harvey White
... I did so a long time ago with photoresist, the back of the aluminum was protected, and it was potassium hydroxide not sodium hydroxide. It did work,
Re: [Homebrew_PCBs] lye
2013-03-30 by Roland Harriston
Whew! A really bad idea! There are so many less dangerous materials that have been used to etch PCB s that have proven to be relatively safe and very effective
lye
2013-03-30 by Rick Sparber
Has anyone used lye to etch aluminum through photo resist? As a test, I put a strip of aluminum in lye plus water and after 15 minutes the strip was half of
RE: [Homebrew_PCBs] Soldermask UV ink/paint/epoxy
2013-03-30 by Boman33
Thanks James, I should not be posting/asking obvious questions when I am very sleepy: It is about 4 in the morning. Silk screening might work for your
Re: [Homebrew_PCBs] Soldermask UV ink/paint/epoxy
2013-03-30 by James
... Same as for photoresist methods, print pads image onto tracing paper/transparency, overlay on painted board (which is covered by polyethylene plastic since
RE: [Homebrew_PCBs] Soldermask UV ink/paint/epoxy
2013-03-30 by Boman33
How do you mask the application not to get the soldermask on the pads? The commercial way is to apply the soldermask using a silk screen process. I have also
Soldermask UV ink/paint/epoxy
2013-03-30 by James
So I ve been doing some (more) experimenting with UV cure soldermask ink, I wondered if anybody had any tips to add. Photos: Copper
RE: [Homebrew_PCBs] Re: etching the OD of a cylinder to create a graduated dial
2013-03-26 by Rick Sparber
Here is an update of my progress: The spray on (negative type) photo resist and developer will arrive on Thursday. In the mean time, I took some nominally
RE: [Homebrew_PCBs] Re: etching the OD of a cylinder to create a graduated dial
2013-03-25 by Rick Sparber
Bertho, I will certainly try using lye on AL. Thanks! My goal here is to find stuff out and hopefully figure out a new way to make graduated dials for hobby
RE: [Homebrew_PCBs] Re: etching the OD of a cylinder to create a graduated dial
2013-03-25 by Boman33
Rick, You can also try etching aluminum using lye. I understand you desire to try new and different procedures but at the same time what are your goals and
RE: [Homebrew_PCBs] Re: etching the OD of a cylinder to create a graduated dial
2013-03-25 by Rick Sparber
I am not ready to abandon contact printing. On my first attempt, I plan to take some large diameter thin walled copper pipe and slice off a 1/2 long piece.
Re: etching the OD of a cylinder to create a graduated dial
2013-03-25 by KalleP
This will not work as is for a cylinder but for a conical scale it might work. Instead of projecting a line and then indexing the dial you could look at some
Re: any chance stick dry film to pcb w/o laminator ?
2013-03-25 by tda7000
Are you trying to lay the film on all at once? That may be why you are getting bubbles. Start at one edge, holding the other end of the film up and working
Re: [Homebrew_PCBs] any chance stick dry film to pcb w/o laminator ?
2013-03-25 by Hari Hendaryanto
hi james thanks for quick response ... this is a good news for me. ... i found that the hardest part was avoiding any bubbles and wrinkles. i m gonna take a
Re: [Homebrew_PCBs] any chance stick dry film to pcb w/o laminator ?
2013-03-25 by Hari Hendaryanto
hi thanks for quick reply, ... datasheet says it should be around 70 - 150 degree celcius, that if using laminator. i used moderate warm iron, though (still
Re: Via Rivets To Fit 0.8mm Hole
2013-03-25 by cunningfellow
... There is a Japanese site selling a version of the old Multicore Copperset through hole system. I found it 6 month ago but can not find it now. Does anyone
Re: [Homebrew_PCBs] any chance stick dry film to pcb w/o laminator ?
2013-03-25 by James
... In my (limited) experience, get a laminator. The results from the non-laminator methods have not been good for me, and they are tricky. A laminator is the
Re: [Homebrew_PCBs] any chance stick dry film to pcb w/o laminator ?
2013-03-25 by Mitch Davis
... Have you tried different temperature settings and times for your iron? For example, a lower temperature? A higher temperature but for a shorter time?
any chance stick dry film to pcb w/o laminator ?
2013-03-25 by Hari Hendaryanto
good day, i m a newbie on photoresist method. i ve read homebrew s archives/forum about how to stick dry film to pcb, all methods involving laminator. is there
RE: [Homebrew_PCBs] Re: etching the OD of a cylinder to create a graduated dial
2013-03-24 by Rick Sparber
Bertho, I have a full machine shop including a Gingery shaper which can cut these tick marks. But my goal is to invent a new way to make a graduated dial.
RE: [Homebrew_PCBs] Re: etching the OD of a cylinder to create a graduated dial
2013-03-24 by Boman33
If you do not have a rotary table it is simple to make one since there is zero force on the subject. A 100 tooth gear will give you accurate indexing. No art
RE: [Homebrew_PCBs] Re: etching the OD of a cylinder to create a graduated dial
2013-03-24 by Rick Sparber
Bertho, I was planning on driving the cylinder with a clockwork mechanism and roasting it under my UV light. If that gives poor results, I will certainly try
RE: [Homebrew_PCBs] Re: etching the OD of a cylinder to create a graduated dial
2013-03-24 by Malcolm Parker-Lisberg
Rick You could try transfer printing like they use to print designs on pottery mugs. Print the resist on a flat silicone pad and roll the dial against it to
RE: [Homebrew_PCBs] Re: etching the OD of a cylinder to create a graduated dial
2013-03-24 by Rick Sparber
Malcolm, I m going to try the spray on photo resist and then a contact print. If that doesn t work, I ll be back at the well looking for more ideas. Rick ...
RE: [Homebrew_PCBs] Re: etching the OD of a cylinder to create a graduated dial
2013-03-23 by Rick Sparber
Donald, Thank you so much for this lead. I just placed the order for the negative photo resist and negative developer. Rick ... From:
Re: [Homebrew_PCBs] Re: Copper Foil
2013-03-23 by Bob Andres
Stewart MacDonald sells various widths of copper tape intended for shielding the insides of electric guitars -- it intended to be soldered. I ve used it for
Re: [Homebrew_PCBs] Re: Copper Foil
2013-03-23 by Missouri Guy
... the inside of a plastic enclosure, jumpering between the pieces. Wouldn t have to be copper. Could be aluminum, tin, etc. I read somewhere that auto
RE: [Homebrew_PCBs] Via Rivets To Fit 0.8mm Hole
2013-03-23 by Paul
Hi, You may have found what you are looking for already, but I have a site that sells many sizes of eyelets, see below, you may find what you need. Hope this
Re: [Homebrew_PCBs] Re: etching the OD of a cylinder to create a graduated dial
2013-03-23 by Donald H Locker
Diazo! Donald. -- *Plain