Re: [Homebrew_PCBs] laser diode photoplotter
2002-04-10 by cbrenizer
a tight cable and pulleys setup has worked for dot matrix printers for years for positioning back and forth. if you find the right old printer, that assembly
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Re: PCB Mill/Drill Project
2002-04-10 by n4onl
Try this a second time since it didn t appear to post... ... shoot ... and ... look a ... this ... just ... Hi John, All questions comments, ect. welcome.
Re: [Homebrew_PCBs] German PCB milling machine
2002-04-10 by Alexandre Guimarães
Hi, That is just a drilling machine, not capable of milling at all. The project has been published by Elektor Magazine. Best regards, Alexandre Guimaraes
Re: [Homebrew_PCBs] German PCB milling machine
2002-04-10 by Brian Pitt
yep close enough to $800 anyway use the translation page at google http://www.google.com/language_tools?hl=en theres a space to enter the URL (2nd field of 2nd
Homebuilt PCB milling machine, another
2002-04-10 by Steve Greenfield
Skateboard bearings! http://www.roboshack.com/index.html Steve Greenfield __________________________________________________ Do You Yahoo!? Yahoo! Tax Center -
German PCB milling machine
2002-04-10 by Steve Greenfield
http://www.radixgmbh.de/ Doesn t that price translate to approximately $800 USD? Anyone here read German? Steve
Re: [Homebrew_PCBs] laser diode photoplotter
2002-04-10 by Russell
... I ve thought of doing it, but my epson is good enough for the moment. It s currently used for some high resolution printers. As for crappy light sources,
Re: [Homebrew_PCBs] laser diode photoplotter
2002-04-10 by Alexandre Guimarães
Hi, ... Usually cheap laser diodes are very bad source for points. The light spreads unevenly and in a weird pattern. The optics to make it a point source
laser diode photoplotter
2002-04-10 by Adam Seychell
Hello group, Has anyone here thought about building or even built a drum photoplotter based on a red LED laser diode ? This would be used for making printing
Re: [Homebrew_PCBs] PCB Mill/Drill Project
2002-04-09 by John van Loon
... Are you really able to get a repeatable and accurite resolution of 0.0005 on your ACME screw? What about motor oscilations and over shoot (gotta love
Re: Scratch and Etch
2002-04-08 by crankorgan
Hi Steve, I am redoing one of my controller boards. It will now drive 4 wire motors. I am drawing the isolation paths in TurbCad. People ask me why I don t use
Re: [Homebrew_PCBs] Re: Scratch and Etch
2002-04-08 by Steve Greenfield
... Yeah! And very little to modify a plotter. Just take an empty pen and drill out the center to fit a carbide tipped pen. Maybe cut off most of the carbide
Re: Scratch and Etch
2002-04-08 by crankorgan
Hi KPL, You are using the wrong coating if it cracks. See Denny s post! I mill circuit boards all the time. The idea of Scratch and Etch came to me the other
Re: [Homebrew_PCBs] Re: Scratch and Etch
2002-04-08 by Karlis
I ve been working this way a few times, manually (have no plotter yet) using some kind of dentist tool, nearly 6000rpm, round-tipped cutter. Just coat the
Re: [Homebrew_PCBs] Making film negatives
2002-04-08 by Steve Greenfield
Added to the bookmarks! Steve ... __________________________________________________ Do You Yahoo!? Yahoo! Tax Center - online filing with TurboTax
Making film negatives
2002-04-07 by Tim Goldstein
If you are looking to go to a film there is a very nice product sold by M&R Marking. It is a negative film system that has extremely easy to use water based
Re: [Homebrew_PCBs] Re: Scratch and Etch
2002-04-07 by milwiron@terrorbydesign.com
Hey John, Thank you for the kind words. A router is still the path for me but I think you ve come up with an excellent idea for people who want to use plotters
Re: [Homebrew_PCBs] Acid Etching and getting rid of the fumes
2002-04-06 by Adam Seychell
... Nitric acid is a controlled substance in Australia. Its not something I would like to have around the house or garage. Do you know the byproducts from
Re: Scratch and Etch
2002-04-06 by crankorgan
Hi Alan, I think Denny nailed it! Yes I am talking isolation. You only etch a thin line between traces. Or you can have the point go around a second time and
Re: Scratch and Etch
2002-04-06 by crankorgan
Denny, Great job! When the idea hit me I was working on a 4 axis 4 wire controller board. I try to be innovative. Like I said in my first message. I am here to
Re: Scratch and Etch
2002-04-06 by Alan Marconett KM6VV
Hi John, I recall the JFax, and AEA s fax. Milling PCB s is quite a challenge, and even more interesting! I didn t quite get the scratch and etch . This is
Re: [Homebrew_PCBs] Scratch and Etch
2002-04-06 by milwiron@terrorbydesign.com
Hello Steve, John and All, I had to run a sample of a redesigned board Saturday morning so I tried a simple Scratch and Etch test of John s idea. Here are some
Re: [Homebrew_PCBs] UV Light Source
2002-04-06 by Adam Seychell
I have agree with Tom on the plain mercury vapor street lamps. they are cheap, readily available and work great. I use 400W, no reflectors, 400 mm distance and
Re: [Homebrew_PCBs] Scratch and Etch
2002-04-06 by Russell Shaw
http://www.dupont.com/pcm/riston/laserseries/fundamentals.html http://www.anvik.com/results.html ... You could have a fibre-optic cable close to the pcb resist
Re: Scratch and Etch
2002-04-06 by crankorgan
Alan, Ralph had a BBS that I used to visit. I drew up his ZipZap antenna as a ZIP package. Fax Dahl was software that would turn Fax audio from my R71a to VGA
Re: Scratch and Etch
2002-04-06 by Alan Marconett KM6VV
Hi John, Yes! I have Taggert s book, and I played around with weather fax s, but AFTER CRT s were common. what is FAX_Dhals? A software package? 73 s, Alan
Exposing Photoresist
2002-04-05 by twb8899
Hi Steve and the group, Most of the dry film photo resist used for printed circuits requires lamps to have the peak spectral output at 365 nanometers. They
Re: Scratch and Etch
2002-04-05 by crankorgan
Hi Alan, I built a similar unit for receiving Radio Faxes from around the world VIA a shortwave radio. My unit used stepping motors from a floppy. That s 20
Re: [Homebrew_PCBs] Scratch and Etch
2002-04-05 by Steve Greenfield
... His new website has more info on it: http://pico-systems.com/ Check out Machining , too, it has more info including the photo plotter. Steve Greenfield
Re: [Homebrew_PCBs] Scratch and Etch
2002-04-05 by Steve Greenfield
Yes, but that happens anyway. You ll only be etching out a narrow channel to start with, so I can t see it being any more of a problem than etching the
Re: [Homebrew_PCBs] Scratch and Etch
2002-04-05 by Henrik Olsson
Denny, list, Interesting idea, but..... If you do scratch thru the coating and into the copper there will be a big chance of under-etching. That is when the
Re: [Homebrew_PCBs] UV Light Source
2002-04-05 by Steve Greenfield
Don t stop! It is good to have you here. So can you tell us, is my memory faulty or does it only require near UV to expose PCB photoresist? I used to use a
Re: [Homebrew_PCBs] Scratch and Etch
2002-04-05 by Alan Marconett KM6VV
Hi Steve, John, list, check out Jon E s photo plotter: http://www.artsci.wustl.edu/~jmelson/photoplot.html While it plots to film, I think you can get a few
Acid Etching and getting rid of the fumes
2002-04-05 by Steve Greenfield
A friend of mine long ago claimed he used a week solution of nitric acid for etching PCBs. Has anyone here tried this? I m thinking I need an exhaust hood in
UV Light Source
2002-04-05 by twb8899
I m new here but find this list very interesting. A good UV lighting system is the plain old mercury vapor lamps. These are commonly used for dusk-to-dawn
Re: [Homebrew_PCBs] Scratch and Etch
2002-04-05 by Steve Greenfield
... Great idea. Anyone here have some and some etchant and want to try it and report back here? Nothing fancy, just coat a scrap of board and then scratch the
Re: Scratch and Etch
2002-04-05 by crankorgan
Steve, In most software you can set the width of the milled area or Isolation. When using a plotter, there will be less drag if the point is fine. Hey Steve!
Re: [Homebrew_PCBs] Re: Scratch and Etch
2002-04-05 by Steve Greenfield
This might be a wierd idea, just say so if it is- How about a pointed bit used in your PCB milling machine, with the laquer coating and a bath in the etchant
Re: Scratch and Etch
2002-04-05 by crankorgan
Hi Denny, The acid will also stay strong because there is less copper etched when doing isolation. I use the Think and Tinker bits. They only last a little
Re: Scratch and Etch
2002-04-05 by crankorgan
Hi Steve, I feel by using the Scratch and Etch method, pen speed and flow will be out of the picture. Most software will allow the outlining to be done. I
Re: [Homebrew_PCBs] Scratch and Etch
2002-04-05 by milwiron@terrorbydesign.com
I m finding John s idea pretty intriguing. Just to take the brainstorming another step: One big problem with PCB routers is tool life and their cost. But using
Re: [Homebrew_PCBs] Scratch and Etch
2002-04-05 by milwiron@terrorbydesign.com
... Very interesting idea. You could use layout fluid for metal working. Most are a lacquer type base and scratch very cleanly since that s exactly what
Re: [Homebrew_PCBs] Scratch and Etch
2002-04-05 by Steve Greenfield
Yep, far too long to expose, and the problem of blooming . UV laser, anyone? That sounds do-able! It would just require modifying a pen with one of those
Scratch and Etch
2002-04-05 by crankorgan
Hi, Nobody liked my light on a plotter idea. I was told the light source would have to move too slow. The board would take way to long. Ok, I use Mechanical
Re: [Homebrew_PCBs] UV Light Source for Exposing PCB's
2002-04-05 by Alan Marconett KM6VV
Hi Dave, Yeah, my kids are grown up! In fact, the oldest is in grad school, and borrowed my eraser , and my PIC programmer! I got my lamp in 77, so I think
Re: [Homebrew_PCBs] UV Light Source for Exposing PCB's
2002-04-05 by Dave King
... Gotta chirp in the middle here ;-] I purchased a metal tool box, a germ light, and a electric timer a few years back. I wired the whole thing up inside so
Re: [Homebrew_PCBs] UV Light Source for Exposing PCB's
2002-04-05 by Alan Marconett KM6VV
Hi Hugh, Yes, quite true! I d forgotten about that! and I m with you on the Altair s too. I have a pair still stashed in the garage. I ve used my lamp for
Re: [Homebrew_PCBs] Re: Printing PCB boards
2002-04-05 by Dwayne Reid
... The stuff we used to use was called Circuit Black but I don t remember the manufacturer s name. Check your local Silk Screen supply house - they should
Re: [Homebrew_PCBs] UV Light Source for Exposing PCB's
2002-04-05 by Hugh Prescott
Actualy the germicidal lamp tube is made of quartz not glass and thats why the cost so much. Glass in general is not very transparent to UV. Had mine since the
Re: [Homebrew_PCBs] UV Light Source for Exposing PCB's
2002-04-04 by Adam Seychell
... there was a recent thread on aus.electronics USENET group about this. search subject UV Light Box Plans in