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2013-03-20 by Rick Sparber
Andy, The dial has to be continuous in most cases. I did have to play around a bit to get it to not overlap but finally did figure it out. By TT I assume you
2013-03-20 by cunningfellow
... These where done with TT (pulsar+TRF) http://www.instructables.com/file/F6S25EMH742SAKC#step22 That is 0.35mm depth of etch on those fingers. I am sure a
2013-03-19 by Andrew Volk
Rick - If the dial has to be continuous and accurate around the entire cylinder, then the etch method has some inherent limitation of getting the wrap just
2013-03-19 by Rick Sparber
Andrew, By new method I mean chemical etching. My hobby is inventing . I do have a lathe, mill, and shaper so could make a dial if I wanted but that is with
2013-03-19 by Andrew
Rick, When you say a new method, do you mean new compared to the mirror-image-on-clear-plastic that you described earlier, or are you also including new as
2013-03-19 by Mitch Davis
... No, I m not that smart :-) ... I m not saying anything :-) Some people do go for quality rather than quantity. Those people, when they say something, I
2013-03-19 by Todd Carney / K7TFC
... Mitch, Hey, that s pretty good! Did you plan the resist pun? Yeah, I m not sure about the rest of us, but I m certainly a little strange. I don t know
2013-03-19 by Mitch Davis
... Oh I see. Mitch.
2013-03-19 by Rick Sparber
Mitch, There are many ways to engrave and/or stamp dials. I m looking for a way to do it with etching. My goal is not the dial but rather a new method. Rick
2013-03-19 by Mitch Davis
... Maybe the stepper could rotate the cylinder and a tool could carve the graduations. Etch, carve, as long as you end up with the graduations ... Mitch.
2013-03-19 by Mitch Davis
... Q: What s the difference between HF and Todd F. Carney? A: One is acidic, and the the other is a caustic :-) Sorry, couldn t resist. Having said that, I ve
2013-03-19 by marcus
that was my real concern. thanks
2013-03-19 by Tony Smith
... It s not that heat resistant. In stained glass it s bent around the glass forming a U-shape, and once that s covered in solder it doesn t matter if the
2013-03-19 by tda7000
True, I guess that s what lmgtfy.com is for ;)
2013-03-19 by Roland Harriston
I agree: But, yet, I wonder about people who will not or cannot use Google (at this stage of the game) to independently look something up. and not broadcast to
2013-03-19 by Rick Sparber
Steve, How would the stepper fit into my plan to etch the dial? Rick ... From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com] On Behalf
2013-03-19 by Duane C. Johnson
HF Hydrofluoric acid Really wicked and useful stuff. http://en.wikipedia.org/wiki/Hydrofluoric_acid Duane -- Home of the $35 Solar Tracker Receiver
2013-03-19 by tda7000
I think it s much better to know what something is, how dangerous and why, so then you ll know exactly why and how you can avoid it. Give people only half the
2013-03-19 by Roland Harriston
... Trust me. You are better-off not knowing what it is. Much, much better-off not ever trying to use it. Good stuff to stay away from. Roland F. Harriston,
2013-03-18 by Todd F. Carney / K7TFC
Google hf acid. The very first item on the page--big as life--will answer your question and tell you all about it. Oh, I m not a chemist, either. I m just a
2013-03-18 by "Zoran A. Šćepanović"
... HydroFluoric acid :-) -- Best Regards, Q Systems Zoran A. Šćepanović zastos@gmail.com Skype: zoran.a.scepanovic http://zastos.com +381 63 609-993 -..-
2013-03-18 by David
HF acid is hydrogen fluoride dissolved in water just like HCl acid is hydrogen chloride dissolved in water. The hydrochloric acid is just a nuisance if you
2013-03-18 by AlienRelics
Metal etching is on topic. What about a stepper motor? 200 steps per revolution. Or if that is not fine enough, bring that down with toothed belt and pulleys?
2013-03-18 by AlienRelics
OK, so keepitsimplestupid hijack s Ricks thread, and smilingcat hijacks keepitsimplestupid s hijacked thread. Interesting. For those of us who are not
2013-03-18 by Norm
... The foil (comes in varying widths) made for stained glass artwork has heat resistant adhesive - it s made to be soldered after sticking to glass. Norm
2013-03-18 by r.d. terramir
well yeah sort of but the way they are bonded is specific just using copper foil will be kinda flakey unless the adhesive you use is heat resistant so you can
2013-03-18 by Leon Heller
... I thought that was how they were made! Leon -- Leon Heller G1HSM
2013-03-18 by Simon
In addission to other comments - consider also a laser printer is partially an electrostatic device, as such I believe the print medium needs to be an
2013-03-18 by David C. Partridge
That s how they *are* made. Also how the Cir-Kit repair sets sold by Pace work. D. ... From: Homebrew_PCBs@yahoogroups.com
2013-03-18 by lex allen
could copper foil be stuck to fiberglass boards to make PCB s? [Non-text portions of this message have been removed]
2013-03-18 by g3oou@...
Hi Mark I suggest that you check at what temperature any plastic backing and the glue on the aluminium tape melts. An ink jet printer with a correct ink might
2013-03-18 by barthie2112
i ask because i m not sure how a foil would react in a laser printer. i m using the printer on my desk at work. i forgot to tape a thin magazine page to a
2013-03-18 by James
Have a look on whatever your local online classifieds/auction is, ebay, craigslist... you will probably find a cheap or free working laser printer (or
2013-03-18 by Rick Sparber
Before you try this, I suggest you watch a few YouTube videos on taking your printer apart. I tried printing to a too think plastic and it did not exit the top
2013-03-17 by tda7000
I suppose the tape itself would be OK if it were thin enough, but the heat from the fuser might melt the glue on the back and squeeze it out the sides onto the
2013-03-16 by lists
In article , ... I would have thought so too but:
2013-03-16 by Harvey White
... The three most common chemicals are: 1) ferric chloride. may or may not be readily available, electronics wise, hard to find. Last price I saw was USD
2013-03-16 by KeepIt SimpleStupid
... From: Roland Harriston Subject: Re: [Homebrew_PCBs] calcium carbonate, HF acid... To: Homebrew_PCBs@yahoogroups.com Date: Friday,
2013-03-16 by Roland Harriston
wow! You dudes play around with some very nasty stuff just to etch a printed circuit! Or, maybe this thread is just a sort of pissing contest to show off
2013-03-15 by smilingcat90254
Calcium carbonate for that matter most carbonate will react with even trace amount of hydrochloric acid remaining in your etchant. And yes it will foam
2013-03-15 by KeepIt SimpleStupid
I used to use concentrated HF at work routinely. Later we had to be specifically certified to work with HF. It s very nasty stuff. I looked at amazon and
2013-03-15 by Rick Sparber
This has been a favorite problem of mine for a long time. It is standard practice to engrave the outside diameter of a cylinder with tick marks and numbers in
2013-03-15 by barthie2112
i have a roll of conductive aluminum foil tape that i bought at oreilly s auto parts a few years back. it looks like this tape on amazon
2013-03-14 by cunningfellow
... Bottom holes dont have to clear pads/balls so can be a lot bigger. Use a high temp solder on the vias and 60/40 on the balls. Use a solder mask of some
2013-03-14 by Mitch Davis
... Our hackerspace bought a Proxxon for our CNC mill because the runout on a Dremel is just so bad. I don t know if we ve done anything that fine, but it s
2013-03-13 by tda7000
I admire your dedication but even as someone who might attempt such a thing myself, I would say it s going to be a big PITA. Not the drilling so much, I think
2013-03-13 by Jeff Heiss
The top of the board is etched first. There are four alignment crosses on the top and holes are drilled through the center of the cross. The bottom is
2013-03-13 by cunningfellow
... In real measurements that is 0.15mm. I regularly do 0.2mm in my Sakai/Mannix drill press. Broken bits only ever happen from my own clumsy hands. I suspect
2013-03-13 by Roland Harriston
WOW! I ve been reading all this chaff about what my Mom called peroxide , and how, ever since I can remember, there was always a bottle of this stuff
2013-03-13 by Todd F. Carney / K7TFC
Charlie, Well, I may have overstated the nastiness of the fumes. It s really no worse in use than, say, photo stop bath or fixer--both of which have a