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Re: Tracing paper and HP Laerjet 1020
Yes the yellow or white papers are silicon coated and perform well. I am using them si?ce 4 years. On Mon, 12 Aug 2019, 2:48 am Kevin Byrne via Groups.Io, <kbyrne10=[email protected]> wrote:
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Re: Tracing paper and HP Laerjet 1020
开云体育Can you point to a web product for the tracing paper...... I've printed on all sorts of paper and even
cooking parchment paper with LASERJET 1012 with surprising success.? I'd like to see what paper you are trying to use there.
On 08/11/2019 09:06 PM, Lee Studley
wrote:
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Re: Tracing paper and HP Laerjet 1020
sometimes the paper has a rough side. flip it over. then try. Otherwise the fuser is/maybe kaput... On Sun, Aug 11, 2019 at 12:24 PM Martin Whybrow via Groups.Io <whybrow_m=[email protected]> wrote: I'm trying to produce masters for photo exposure boards using tracing paper (110gsm) through my Laserjet 1020; for some reason, the toner isn't fusing to the paper and is smearing across the paper. I've tried setting the printer to transparency mode, assuming it will increase the fuser temperature for the heavier media, but it's having little to no effect. Prints on regular 70gsm paper are perfect, so the printer appears to be OK. The cartridge is fairly recently installed and is a genuine HP one. |
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Tracing paper and HP Laerjet 1020
I'm trying to produce masters for photo exposure boards using tracing paper (110gsm) through my Laserjet 1020; for some reason, the toner isn't fusing to the paper and is smearing across the paper. I've tried setting the printer to transparency mode, assuming it will increase the fuser temperature for the heavier media, but it's having little to no effect. Prints on regular 70gsm paper are perfect, so the printer appears to be OK. The cartridge is fairly recently installed and is a genuine HP one.
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New member.
I have been in electronics and pcb design for 40 years.
Things have changed a lot over the years. I remember buying EasyPC in around 1990 and quickly became frustrated with lack of functions and bugs. So? I wrote my own and still selling it now. I wont give the name as I don't want to spam the group. I have designed around 300 pcb's in my time. I used to make my own pcb's but the Chinese can make them for peanuts now so I mostly get mine done in China. Current project is a USB PC oscilloscope that runs at 12.5 mega samples per second. The pcb is partly SMD so simply far too fine for a home made pcb. I have got the manufacturer to solder the fine scale SMD parts on for me. |
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Re: Inkjet PCB printing patentable? Everything old is new again
Anybody remember Don Lancaster??? TTL Cookbook, The incredible Secret Money Machine, and numerous other memorable tomes whose names escape me right now. His screed was:? "Release the technology into the public domain, sell lots of it, and retire."? His philosophy was that it took so long to get a patent that even if you DID get the patent, you'd be at least a year later to market. That was in the 1960s.? Now it's closer to 3 years, and only litigants seek patents.?? You ever try patenting something that somebody in Shenzhen already pirated and put on ebay or alibaba? I'm not a lawyer, but I think that this Australian company is taking a flying leap at a hopping red kangaroo with their patent attempt.? Their process is interesting, but is based solely on prior art and adds NOTHING to the world of patentable intellectual property.? The best they can do is cover it and then publish and release under GPL. 73 Jim N6OTQ Again, not a lawyer, but a professional writer and hobbyist tinkerer with almost half a century doing this stuff. |
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Re: Inkjet PCB printing patentable? Everything old is new again
开云体育Yeah, I can’t see the non-obviousness either.? What do they think DLP is anyway? ? As you say UV ink printers have been around forever, and as they print on practically anything what’s so hard about doing it on PCBs?? That’s how people do those custom phone cases etc: ? Even UV ink printing on fingernails is old hat, as this 5 year old video: shows. ? Tony ? ? From: [email protected] [mailto:[email protected]] On Behalf Of Steven Greenfield AE7HD via Groups.Io
Sent: Monday, 22 July 2019 10:09 PM To: [email protected] Subject: [homebrewpcbs] Inkjet PCB printing patentable? Everything old is new again ? Someone says they are patenting the process of printing graphics onto PCBs. Not for resist, but specifically graphics. |
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Inkjet PCB printing patentable? Everything old is new again
Someone says they are patenting the process of printing graphics onto PCBs. Not for resist, but specifically graphics.
I can't see what is new about this. You have been able to buy UV ink printers that can print on just about any substrate, porous or nonporous, for decades. Obviously, people have been printing onto PCBs for etch resist and silkscreen marking for at least a decade. I've posted on the Littlebird page, but the comment must be approved. So I don't expect it to appear. -- Steven Greenfield AE7HD |
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Re: Off-topic chemical reaction.
Hey Keith , thanks for your reply!!!
On Saturday, July 13, 2019, 09:42:34 PM GMT-3, keith <keethpr@...> wrote:
The white impurity’s may be ammonium chloride which is the electrolyte used in these batteries. When I was in junior high they used 3% drugstore peroxide and manganese dioxide for this. We put it in a test tube and set it in warm water. It gave off oxygen ? On Jul 13, 2019, at 5:42 PM, hyu hyu via Groups.Io <hyu2123@...> wrote:
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Re: Off-topic chemical reaction.
Our company recently had a batch of blank PCBs made.? The spec was the boards were to be masked white.? The boards house uses gold plating for RHOS.? Apparently when the boards went thru some final wash, the gold interacts with what ever they use for the white solder mask and turned 30% of the boards PINK!!!!!!? Our boards need to be white because they are used in eye testing light boxes and it helps the reflectivity of the light.? Next go around, we have to specify NO GOLD! Paul Mateer, AA9GG Elan Engineering Corp. |
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Re: Off-topic chemical reaction.
开云体育The white impurity’s may be ammonium chloride which is the electrolyte used in these batteries. When I was in junior high they used 3% drugstore peroxide and manganese dioxide for this. We put it in a test tube and set it in warm water. It gave off oxygen ?On Jul 13, 2019, at 5:42 PM, hyu hyu via Groups.Io <hyu2123@...> wrote:
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Off-topic chemical reaction.
Hello everyone, I hope you could help me with this I mixed hydrogen peroxide (volume 250) with Manganese dioxide in a bottle Is it safe the oxygen that is released through the bottle. ( like doing it indoors) The manganese dioxide was obtained from AA battery? ( with some white impurities) Thanks |
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Re: How do you make nice clean cutouts in pc board material?
开云体育I can not impress you all how easy this is to do without any extra steel supporting ruler. I draw the lines with a marker on the PCB. I rest my hand on the table when cutting and simply follow the line. I wear a full face shield and a dust mask. It cuts like butter and does not run away or skip. One thing you MUST accept when using cutoff wheels is that they do shatter so be ready. Wear a face shield. Have extra cutoff wheels waiting with a
screwdriver. You will be amazed how easy this is if you have never played with this tool before. The abrasive wheels and sanding disk barrels are
all I ever use with this tool. You can shape? metal, cut threaded rod, cut nails. Sharpen drill bits. Sharpen a chainsaw,? sharpen at circular saw. ANYthing you would use a file to sharpen becomes fair game with this tool. ?It will cut a chain links and locks. and its now available as a battery operated tool so it goes every where.
On 06/24/2019 11:10 PM, MVS Sarma
wrote:
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Re: How do you make nice clean cutouts in pc board material?
I remember Jim saying, hand stability and 1" circular cutters breaking offbeing carbide make.? Perhaps one has to take support of a steel ruler while tryong long straight cuts. It is question of one's own experience. sarma? ?vu3zmv On Tue, 25 Jun 2019, 2:26 am Rob via Groups.Io, <roomberg=[email protected]> wrote: I don't understand what the problem here is. You don't need diamond |
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Re: How do you make nice clean cutouts in pc board material?
I don't understand what the problem here is. You don't need diamond cutters and milling machines.
DREMEL cutoff wheels EAT PCB material like spreading butter. There has never been any? tool in my tool box that shapes PCBs as easily as a DEREMEL cutoff wheel. |
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Re: How do you make nice clean cutouts in pc board material?
A couple of years ago, based on a post in an online discussion, I bought a 4" "nearly a toy" table saw from Hazard Fraught Tools to cut PCBs. It really works well on PCBs, better than any other saw i have tried. I haven't used it for anything else but based on comments in online reviews of it and similar saws it may be the only thing it does well. ? I realize that you are trying to make a cut-out and not a straight cut, but lacking a milling machine or CNC router, I think sintered diamond bits are your best option. Cut a crude hole with a coping saw to within 1/8"- 3/16" or so of your final size. Get a small diameter cylindrical diamond coated bit for your Dremel, either one from Dremel or a cheap Chinese one. I wouldn't use one smaller than 1/8" or possibly 3/32'. Mount the Dremel with the bit pointing up through a table so your hands are free to guide the PCB. You could use the Dremel router-shaper table or make your own possibly using their drill guide attachment. I just tested this holding the Dremel in one hand and a small scrap of PCB in the other and was able to get within 0.01" to 0.02" of a scribed line. Take your time and don't force it, use a slower speed on the Dremel for less aggressive cutting if necessary. ? This will still leave you with a small radius (1/16") at the corners that you may need to file. The best way to do this is with a file with a "safe edge" - an edge with no teeth. I use a 1/8" square file that I ground the teeth off of one of the four sides with a belt sander (as per: - although I held the file perpendicular to the belt and didn't need to make a magnetic holder). ? If your PCB is not bare (still has copper on it) the best way to make a visible but fine line to mark your cut-out is to go over the area with a black or blue Sharpie pen then use a ruler and scribe (or sewing needle) to lightly scribe through the ink. ? Craig L ? |
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Re: How do you make nice clean cutouts in pc board material?
开云体育I have a couple Adel nibblers but have never been able to get them to go straight!? I have better luck with a coping saw or jig saw than I ever did with a nibbler.? Also it looks like by the time I got the hole big enough to get the nibbler in I would already have the entire LCD hole cut out...well almost.Thank you. Jim On 6/23/2019 11:25 AM, Ben Hall wrote:
I'm a big fan of sheet metal nibblers such as this one at Amazon: |
Steven Greenfield AE7HD
AA9GG