Re: vacuum hold-down for exposure box
2009-03-22 by Steve
Oh, and -please- start a topic by opening a fresh new message and addressing it to the group. When you started a new topic by replying to the Brother Printer
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RE: [Homebrew_PCBs] Re: vacuum hold-down for exposure box
2009-03-22 by stewart stinson
That reminds me I must look for my glass nails.... :) To: Homebrew_PCBs@yahoogroups.com From: dj@delorie.com Date: Sun, 22 Mar 2009 12:09:19 -0400 Subject: Re:
Re: vacuum hold-down for exposure box
2009-03-22 by Steve
... You don t say how big the tube was, but if you can stopper it with a finger then it is probably 3/8 or 1/4 inch ID. Well, 5 psi of pull would translate to
Re: [Homebrew_PCBs] Re: vacuum hold-down for exposure box
2009-03-22 by DJ Delorie
... That s why I was looking for my vacuum gauge :)
Re: [Homebrew_PCBs] vacuum hold-down for exposure box
2009-03-22 by DJ Delorie
... Maybe I missed a bit of info... the first time I tested it, I had nothing in it - just the glass panel with the gasket around the edges. I guessed that
Re: [Homebrew_PCBs] vacuum hold-down for exposure box
2009-03-22 by William Alford
... i ve built several vac hold downs over the years and the trick is to have the substrate supported everywhere. one way i did this was to take a piece of
Re: [Homebrew_PCBs] vacuum hold-down for exposure box
2009-03-22 by Stefan Trethan
LOL you are not supposed to suck the glass down! The vacuum exposure units I have seen use a flexible clear plastic cover (like clear plastic tablecloth) to
Re: vacuum hold-down for exposure box
2009-03-22 by warrenbrayshaw
... Sounds like you need a calibrated hole :) Just like a domestic vacuum cleaner, have a hole in the vacuum pipe to reduce the effective vacuum. Warren
vacuum hold-down for exposure box
2009-03-22 by DJ Delorie
Just a note about today s task. I scrounged some tubing and made some adapters, got some scrap rubber gasket material, and converted my UV exposure box to
Re: Brother Printer
2009-03-21 by Steve
... I would not expect them to give up the horse. That is smart marketing. I wish I could have at just a little of that marketing sense in me, maybe I d have
Re: Brother Printer
2009-03-20 by trevwhite74
... No, I do not think I really explained what I meant properly. I would not think they are cynical to be honest. Looking at the web site there is lots of
Re: [Homebrew_PCBs] Re: Brother Printer
2009-03-20 by Myc Holmes
Trev, I wouldn t call Pulsar cynical. They just found a way to make a profit in a niche market. That s just good business practice. The key is to be a smart
Re: Brother Printer
2009-03-20 by trevwhite74
... This is very interesting information. I have been looking at the Pulsar product. I am new to toner transfer but find it very interesting. Anyway, once you
Re: [Homebrew_PCBs] Re: Brother Printer
2009-03-20 by Myc Holmes
Hi Jerry, Papermaking requires multimillion dollar equipment, well beyond the scope of the homebrew pcb vendors. Pulsar has carved out a very nice niche by
Re: Brother Printer
2009-03-19 by Ken H>
Hello Jerry - it s been several days since your post and I m VERY interested in how the Brother worked with the release paper and green foil from
re: dry film photoresist
2009-03-17 by tuck
Adam, I didn t see the last page till now. Ignore my suggestion b). Sorry. Tuck, AF6GQ --
re: dry film photoresist
2009-03-17 by tuck
Excellent work, Adam. I have two suggestions. a). Add the actual degreaser name/formula/whatever to the caption or photo on page 6. Maybe moving your arm will
Re: Differences between negative dry film resist and pre-coated positive resist
2009-03-17 by Ben
... I use the M G Chemicals 600 series boards normally the 630 8 x 12 this is positive resist. I have had good results in using them. One of my boards is
Re: [Homebrew_PCBs] Differences between negative dry film resist and pre-coated positive resist
2009-03-16 by KeepIt SimpleStupid
Since I had a real photolithography lab to play with, I could make some small boards. The resist was spin coated. Basicallly gripped with vacuum and spun at
Re: [Homebrew_PCBs] Differences between negative dry film resist and pre-coated positive resist
2009-03-16 by Adam Seychell
... I ve never used pre-coated positive photoresist boards so I cannot comment. Does anyone know how this resists is applied, since I don t think dry film
Re: Direct Laser PCB's (not TT)
2009-03-16 by drpain1313
Well, the LaserPCB has an adhesive and peel-away liner attached, so I m not sure if it would be suitable as a flex circuit. I suppose it would depend on the
Differences between negative dry film resist and pre-coated positive resist
2009-03-15 by dbrock178
Hello all, I am looking to create my first homemade pcb using the photolithlgraphy method. I ve read some tutorials on both methods and did some browsing on
Re: Direct Laser PCB's (not TT)
2009-03-15 by warrenbrayshaw
... Remember toner is a plastic and black stuff mix so fused toner is likely to expose a high proportion of plastic. This would likely preclude plating
Re: [Homebrew_PCBs] Re: Direct Laser PCB's (not TT)
2009-03-15 by Jack Coats
I wonder how using Micr toner then plating copper onto it instead of etching it off wold work?
Re: [Homebrew_PCBs] Re: Direct Laser PCB's (not TT)
2009-03-15 by Kim Vellore
Dave, So could we use the kapton laminate by itself as a flex pcb?. I was looking for some flex pcb. Kim ... From: drpain1313 To:
Re: MICR toner?
2009-03-15 by James Newton
... MICR toner has a minimum amount of magnetic material in with the toner so that the printed text can be sensed with a magnetic pickup. That magnetic
Re: [Homebrew_PCBs] Re: Direct Laser PCB's (not TT)
2009-03-15 by mlerman@ix.netcom.com
Hi Roger, Yes, I do remember. I lost interest a year ago, but got interested again recently when I got a Brother HL-2140 printer. The printer has a fairly flat
Re: Direct Laser PCB's (not TT)
2009-03-15 by rogerfdupont
Hi mark, I don t know if you remember me, but some time ago I asked for your advices on modifing a HP 6L laser printer. I had the same problem you said about
Re: dry film photoresist
2009-03-15 by trevwhite74
... That is a really great tutorial. Thanks for sharing with us. I think I will use itwhen I get the chance. Thanks again. Trev
dry film photoresist
2009-03-15 by Adam Seychell
Hi, I ve written little manual on dry film photoresist wet lamination for the hobbyist. Might be of interest to 1 or 2 people here. I still haven t gotten
Re: [Homebrew_PCBs] Re: Direct Laser PCB's (not TT)
2009-03-15 by mlerman@ix.netcom.com
I think the fuser scraped the toner off because the board couldn t heat fast enough to fuse it. I ve destroyed a couple of printers doing these tests but I
Re: Direct Laser PCB's (not TT)
2009-03-15 by James Newton
... I m not sure I understand why nothing printed here... ... That is very interesting... Why did removing the fuser cause it to print? ... I would be
Re: Direct Laser PCB's (not TT)
2009-03-14 by drpain1313
Check out www.laserpcb.com We make copper foils laminated to kapton that you can put through an unmodified laser printer and directly deposit the toner onto
MICR toner?
2009-03-14 by Mike Young
So, I carelessly placed an order for a toner cartridge. It wasn t until after completing the order that it finally dawned that MICR wasn t a random acronym.
Re: [Homebrew_PCBs] Re: Toner Print quality
2009-03-14 by Stefan Trethan
The algorithms are well understood, mathematically sound and all that. For example if you put something in a ZIP file not one bit can be changed, or it won t
Re: [Homebrew_PCBs] Re: Toner Print quality
2009-03-14 by Jack Coats
I agree, their perspective (with our money) is different. For them lossless archives are their goal. Loosing something with an algorithm that usually ,
Re: [Homebrew_PCBs] Direct Laser PCB's (not TT)
2009-03-14 by Mark Lerman
I m not sure about the charge problem, but the way I planned to handle the drum was with soft plastic on the leading edge of the board and by beveling and
Re: [Homebrew_PCBs] Re: Toner Print quality
2009-03-14 by Stefan Trethan
It doesn t surprise me that the concept of lossless compression does not seem to mean anything to the government. After all, they never do the same work for
Re: Toner Print quality
2009-03-14 by trevwhite74
... Now that is something interesting. That maks sense. I shall have a look for these settings. Thanks
Re: [Homebrew_PCBs] Re: Toner Print quality
2009-03-14 by Jack Coats
I saw a quip on TV the other day about the Library of Congress doing archiving of documents and pictures. They are doing everything in un-compressed TIFF to
Re: [Homebrew_PCBs] Direct Laser PCB's (not TT)
2009-03-14 by Stefan Trethan
Absolutely none is a strong statement. I would say there is a number of good reasons why it does not work. The toner is transferred from the drum to the paper
Re: Hmm, bead blasting?
2009-03-14 by Steve
... I can t say enough to warn about silicosis. Tiny bits of sharp glass that you can t cough out, that slowly work their way through your lungs, scarring and
Re: Toner Print quality
2009-03-14 by Steve
... PNG is good for photos and line drawings. PNG uses non-lossy compression, depending on the program you use it can compress quite a bit. It also supports
Re: Toner Print quality
2009-03-14 by Steve
... I was thinking the same thing. ... That looks like dithering, intentional noise inserted by the driver for better greyscale images. Trev, you might look
Re: [Homebrew_PCBs] Direct Laser PCB's (not TT)
2009-03-14 by Mark Lerman
As an addendum, it will also print on a sheet of thin aluminum. I just ran a piece of 10 mil aluminum flashing through the printer - it printed, but the lines
Re: [Homebrew_PCBs] Re: Which PCB CAD for someone entering the job market?
2009-03-14 by Piers Goodhew
... CADSoft do have a public, we-don t-guarantee-it library sharing area:
Direct Laser PCB's (not TT)
2009-03-14 by Mark Lerman
For anyone interested, there is absolutely no reason that laser printers cannot directly deposit toner on pcb boards. The practical problems are the fuser and
Re: Toner Print quality
2009-03-14 by trevwhite74
Hi guys. The original prints were taken from printing out pdf files of DJ Delorie s spirals and then looking at the traces with a digital microscope. The
Re: [Homebrew_PCBs] Hmm, bead blasting?
2009-03-14 by William Alford
... yes, i do art glass carving and have such equipment. bead blasters will not cut materials and are used to clean motor parts, etc. silicon carbide (sand)
RE: [Homebrew_PCBs] Re: Toner Print quality
2009-03-14 by Tony Smith
... with ... visual ... stand ... have many ... artifacts) ... though ... BMP has no patents (unlike GIF & JPEG), so it s irrelevant that Microsoft created it