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2013-03-23 by Donald H Locker
Might I suggest using a commercial product first (to verify one part of the process using known commercial materials) then move to making your own photoresist?
2013-03-22 by Todd F. Carney / K7TFC
Lex, Maybe you want to consider buying your pcb material at eBay. That s where I ve gotten mine. There are sellers for just bare board stock as well as
2013-03-22 by Malcolm Parker-Lisberg
Rick You could use one of the etch resist pens on it though. Malcolm I don t suffer from insanity I enjoy it! Mene, mene, tekel, upharsin The writing is on the
2013-03-22 by Rick Sparber
Jim, Looks like a fun machine but a bit too complex compared to contact printing and chemical etching. Rick ... From: Homebrew_PCBs@yahoogroups.com
2013-03-22 by Jim
... Maybe an Eggbot with a scriber if the cylinder isn t too big? http://egg-bot.com/
2013-03-22 by lex
Todd: I was not anything that super important. The thought of making PCB s on demand and trying to save some $$$ while doing so. I few boards I used to buy and
2013-03-22 by Rick Sparber
Harvey, Pantographs and lasers are all existing technologies. My hobby is to invent new things, especially things that are simple. So if I could apply some
2013-03-22 by Rick Sparber
Charlie, I would prefer something that I can dip the part into and have it come out with a uniform thickness. But since I have not seen anything like this as a
2013-03-22 by Todd F. Carney / K7TFC
Lex, Presuming you already have single-sided material, and if you already have the copper foil (and you have no other likely use for it), it might be worth
2013-03-22 by Missouri Guy
... Now THAT would be great!!!! Something that can be sprayed on with a household sprayer. AND, some kinda stuff that would have a good shelf life. Charlie
2013-03-21 by eliocor1
... correct. ... I use the 0.4/0.6, 0.6/0.8 and 0.8/1.0mm ones, but my preferred ones (for my high density SMD PCBs) are the 0.4/0.6mm rivets which are used
2013-03-21 by Harvey White
... Try a pantograph and larger patterns to engrave the numbers. Another option would be Laser engraving. You need to rotate the cylinder and move
2013-03-21 by Rick Sparber
Cary, I found this information very good for etchant formulas but all of the resists are non-photo. Got any homemade photo resist formulas? Rick ... From:
2013-03-21 by Rick Sparber
Andrew, I know that photo etching has been done on flat plates so assumed it could be made to work on a cylinder. I would wrap the artwork around the cylinder
2013-03-21 by Rick Sparber
What do you suggest for user applied photoresist? PnP? Rick ... From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com] On Behalf Of Boman33
2013-03-21 by Rick Sparber
Sorry, but I was not part of your we .... But I am now :-) Thanks, I ll study up on it. Rick ... From: Homebrew_PCBs@yahoogroups.com
2013-03-21 by lex allen
I really was trying to make a single side board into a two sided board. Figured i would have to use epoxy of something to stick it down [Non-text portions of
2013-03-21 by James
... Yes, Royal Mail is usually very cheap, and fast, I ve often bought things from the UK they are here in a week and for shipping prices pretty comparable
2013-03-21 by lists
In article , ... Checking a few sources myself, I see at one seller, 0.8mm rivets /internal/ size so this is probably the reason.
2013-03-21 by lists
In article , ... Hmmm, to ship a 10g package to NZ would cost £3.30, £5.10 for 250g, using the 5 day, airmail small packet
2013-03-21 by James
... The solder mask will be applied after riveting and soldering vias, but before soldering the other components, it will limit flow on those fwiw, but you re
2013-03-21 by Boman33
If you are going to solder them on the top you will be OK. It is actually not a solder mask that you are referring to then since it is supposed to limit
2013-03-21 by James
... It was my intention to solder both sides after setting the rivet from both sides (the ring should be fractionally wider than the rivet head to allow
2013-03-21 by Boman33
Note that what you are proposing was a cause of reliability problems with rivets in the early days of PCB manufacturing. You are even making it worse with the
2013-03-21 by AlienRelics
Yes, thanks, I know what the heck hydrofluoric acid is, I ve known since I was, well, can t remember how young I was. And known that it can even eat through
2013-03-21 by James
... Particularly I want to use rivets because I think I should be able to apply (uv cure ink stuff) soldermask right over the top of them for a very clean
2013-03-21 by Todd F. Carney / K7TFC
I think I ve already admitted my stupidity here, and that I regret my off-the-cuff response. I guess all that s left is to apologize to you personally, and to
2013-03-21 by AlienRelics
-You- inserted sarcasm into my question. I had a pretty good idea that HF meant hydrofluoric acid. I was asking partly for those on the list who don t know
2013-03-21 by James
... Thanks for the link, that s a pretty good price actually, looks like it s the same as the megauk ones but a bit cheaper, and maybe VAT would be deducted
2013-03-21 by Paul
Have you considered copper wire instead of rivets? Less expensive and work just as well. de Paul, W8AEF ... From: James Sleeman Sent: Wednesday, March 20,
2013-03-21 by Boman33
If absolute best accuracy is wanted, coat the part with photoresist and mount it on an accurate turntable. Set up an optical projector projecting just one
2013-03-21 by cunningfellow
... Well we know inkjets work for molten wax.
2013-03-21 by cunningfellow
... The original robot picture did not have straight lines. However when etching down 0.35mm you are always going to get undercut and the undercut on toner
2013-03-20 by eliocor1
I use rivets made by Bungard and I buy them from Watterott: http://www.watterott.com/en/Bungard the price for 0.8mm (1000 pieces) is 19.04 Euros (20% VAT
2013-03-20 by James Sleeman
... If it turns out that is the only economic choice [and it looks like it is so far], then yes. I just prefer to standardise hole sizes where possible, and I
2013-03-20 by Corona Sensei
... Someone like this may help: http://www.ship2anywhereusa.com/pricing/ I haven t used them myself, but have kept their link in my bookmarks for things like
2013-03-20 by tda7000
I don t know how China does it but their postal service is pretty good. Everything I buy on eBay is free shipping or close to it. Even if it s included in
2013-03-20 by James Sleeman
... About 10 times more costly than megauk. ... I have no problem paying reasonable shipping, I purchase all manner of items from overseas every week, for very
2013-03-20 by tda7000
Can you not just enlarge the holes or drill at 0.9mm to start with? If your tolerances are that tight that it MUST be 0.8mm, then I think the rivets will not
2013-03-20 by William Laakkonen
Well now, the *price* is USD 49.95 for 100 pieces, the shipping is coming at $100 - so perhaps you should consider inquiring with the supplier for an alternate
2013-03-20 by James Sleeman
... I live in New Zealand. Thanks for your link, but the price is insane - for 100 Rivets $144 USD including shipping.
2013-03-20 by cary heestand
Hi Andrew, here is a link to a pretty good PDF for art type etching. It gives both etchant formulas and resist formulas. Knife makers and jewelry makers
2013-03-20 by Andrew
I went back and looked at some dials, and revised my estimate -- I think a line of .005 to even as much as .010 would be acceptable, unless the dial is very
2013-03-20 by Rick Sparber
My gold standard are the dials on my Craftsman/Atlas lathe. My guess is those scribed lines are around 0.002 wide and the numbers are all perfect. It was
2013-03-20 by Rick Sparber
Andrew, I ve been tilting at this windmill for a few years on and off. So far, none of my methods have been good enough although printing to clear plastic
2013-03-20 by Andrew
This picture is certainly helpful, but does raise some questions. I notice some waviness in the outlines, but I am guessing that may have been intentional? For
2013-03-20 by Andrew
As I said, I understand that you want to try the etching route; I was just curious if you had also explored the other options. Some of the later responses have
2013-03-20 by William Laakkonen
Well James, I have to guess where on earth you are- but have you seen this? http://www.circuitmedic.com/products/115-7000.shtml When looking for a source and
2013-03-20 by Boman33
The rivets look nice in the picture but they are the wrong type if you want a long-term reliable product. See an old post below: Bertho The problem with the
2013-03-20 by James
Hi all, I would like to use some via rivets, thing is, I want to use them in a 0.8mm drill hole. I purchased a few (from a Taobao seller) which were advertised