Re: [Homebrew_PCBs] Re: pump for spray etching
2003-10-01 by Stefan Trethan
What you describe there is a simple membrane pump. thousands sold each year (a lot of them for air pumping). i tried it with a speaker @50hz, speaker diameter
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Re: pump for spray etching
2003-10-01 by Steve
Using larger diameter silicone tubing means it isn t hard to fully collapse the tube for a peristaltic pump. And you always use 3 ball bearing rollers, can t
Re: pump for spray etching
2003-10-01 by Dave Mucha
... in ... A larger tube could be used, and that would offer more volume. means a bigger motor, that may not be a problem. I didn t like compressed air as
Re: [Homebrew_PCBs] Re: pump for spray etching
2003-10-01 by Russell Shaw
... They re also used in inkjet printers for head priming/cleaning.
Re: [Homebrew_PCBs] pump for spray etching
2003-10-01 by Stefan Trethan
but you need to fully compress the hose. otherwise the liquid flows back in the gap left open. would be hard with thick hose to fully compress (and have it
Re: [Homebrew_PCBs] pump for spray etching
2003-10-01 by Markus Zingg
... Yep, tank refueling is what they are used for. ... Would that not change if a motor is used? The tube could have a dameter of say 1/2 and this would
Re: [Homebrew_PCBs] Re: pump for spray etching
2003-10-01 by Stefan Trethan
right that therm is for what i thought of... the aquarium pump are really not too strong... i didn t think about that. maximum pumping height only 3 meters..
Re: pump for spray etching
2003-10-01 by Dave Mucha
The term is Peristaltic. produced by the successive contraction of the muscular fibers of their walls, forcing their contents onwards; as, peristaltic
Re: [Homebrew_PCBs] pump for spray etching
2003-10-01 by Stefan Trethan
@markus: i think your pump principle is like those medical silicon hose rotrary pumps . they are used for pumping blood and other liquids. the advantage is
RE: [Homebrew_PCBs] pump for spray etching
2003-10-01 by Marty Grove
Chemcut is once again making their tabletop, conveyorized etching / developing system. It has oscillating spray, a rinse station after the process chamber,
Re: [Homebrew_PCBs] pump for spray etching
2003-10-01 by Markus Zingg
Hi Adam ... Acording to Bungard the etching process of THEIR machines is total uniform - as oposed to the (el cheapo) machine I unfortunately first bought. I
Re: cnc routing of a proto board
2003-10-01 by ghidera2000
Oh and one not of caution. Milling a board changes its responses to high frequencies. Shouldn t be a problem for run of the mill stuff but radio etc is
Re: [Homebrew_PCBs] pump for spray etching
2003-09-30 by Adam Seychell
Thanks for the pointers to the rotary pipe etching machine. I would agree this machine looks mechanically simpler and cheaper than a oscillating spray nozzle
Re: cnc routing of a proto board
2003-09-30 by wb0yrq
check http://www.acsnet.com/~al/cnc/gcode.zip these are eagle ulps for isolation exporting gcode I havent made a board yet as my machine isn t quite done, but
Re: cnc routing of a proto board
2003-09-30 by Dave Mucha
... cnc ... Check the CAD_CAM_EDM_DRO group at yahoo. search the archives for pcb or isolation and you ll get tips and hints on how to get good results.
Re: [Homebrew_PCBs] pump for spray etching
2003-09-30 by Stefan Trethan
May i add that if you don t get enough pressure for spraying due to centrifugal force it may be a good idea to add a small pump to it. (my suggestion is a
Re: [Homebrew_PCBs] pump for spray etching
2003-09-30 by Markus Zingg
I agree with Stefan that building a rotary kind of spray etcher is most likely a lot easier. I do have one that I boght a while ago. I first was happy, but
Re: [Homebrew_PCBs] pump for spray etching
2003-09-30 by Stefan Trethan
why not build the rotrary spray etcher? it sed only a plastic pipe, with holes for spraying on the upper part. high speed driven by a motor on top of the tank.
pump for spray etching
2003-09-30 by Adam Seychell
Anyone here every built a spray etcher ? I m looking at building a spray etcher on the cheap, but I cannot find a suitable pump. Pressure requirements are
Re: cnc routing of a proto board
2003-09-30 by ghidera2000
... cnc ... Check for KCam, MachI, and DeskCNC. All three are CNC software that can accept gerbers and do trace isolation milling. There s even a group here on
Re: [Homebrew_PCBs] film processing - was: Kepro FR4 presensitized laminate
2003-09-29 by Adam Seychell
You are correct, its not a huge advantage being able to apply your own dry film photoresist for conventional print and etch. However, for producing plated
Re: [Homebrew_PCBs] dry film exposure - was: film processing
2003-09-29 by Markus Zingg
Hi Stefan Reading my post again, I must have been in a real hurry typing it :) ... I see.. Well, again, I m out of the experimenting stage for the moment. My
Re: [Homebrew_PCBs] dry film exposure - was: film processing
2003-09-29 by Stefan Trethan
i think i described it not precise enough.. (expected you know the bungard barrel exposure plotter). The idea is to put the film on a drum (before
Re: [Homebrew_PCBs] film processing - was: Kepro FR4 presensitized laminate
2003-09-29 by Markus Zingg
... Well - all - I don t know, but for me this is a must. Otherwise it will not work. ... Well, never tried something like this and I highly doubht if the
Re: [Homebrew_PCBs] film processing - was: Kepro FR4 presensitized laminate
2003-09-29 by Stefan Trethan
... hi markus... i see, for hole covering it is a good method (maybe the only). i did know that but somehow didn t think of it.... but you all expose the film
Re: [Homebrew_PCBs] film processing - was: Kepro FR4 presensitized laminate
2003-09-29 by Markus Zingg
... Hi Stefan I use photoresist because of through hole plating process requirements. Only with this resist I can cover the holes after the through hole
Re: [Homebrew_PCBs] film processing - was: Kepro FR4 presensitized laminate
2003-09-29 by Stefan Trethan
But i still don t really know which advantage the dry (wet) film has. May you lay out the advantages compared to presensitized boards? As i understand it is
Re: [Homebrew_PCBs] film processing - was: Kepro FR4 presensitized laminate
2003-09-29 by Adam Seychell
I should add some explanation to the photos I took earlier and uploaded to the following location; http://members.optusnet.com.au/~eseychell/pictures The dry
Re: [Homebrew_PCBs] dry film processing
2003-09-29 by adam Seychell
Try contacting a local PCB fabricator and see if they will sell you the last 10 meters off the dry film rolls, when they next do a change over on the hot roll
Re: Kepro FR4 presensitized laminate
2003-09-27 by twb8899
Ron, Let me know if you need help with laminated panels. I have a dry film laminator and use a resist similar to the DuPont material. The resist I use is
cnc routing of a proto board
2003-09-27 by Moore
I use Eagle for circuit and pcb design. I have access to a hobby cnc router. Any links as to the process to do this? Software etc. Thanks, Phil
Re: [Homebrew_PCBs] Re: colophony resin in laquer thinner
2003-09-27 by Stefan Trethan
thanks... in fact in the past i did a lot of rework with different sharpie like pens. (when i used photoresist and had problems with getting the
Re: [Homebrew_PCBs] Kepro FR4 presensitized laminate
2003-09-27 by Markus Zingg
... Isn t Bungard also selling in the us (asuming you live there)? They do have a photoresist from an english manufacturer (sorry, don t have the name handy)
Kepro FR4 presensitized laminate
2003-09-27 by Ron Amundson
Since Kepro went out of business, I need to find a new supplier of presensized negative acting photoresist material . I tried some positive material from
Re: colophony resin in laquer thinner
2003-09-27 by Ben H. Lanmon
GC Electronics is under GC/Waldom website does not tell you much as I believe that you have to be registered dealer to get to most information on the site.
Re: [Homebrew_PCBs] Re: colophony resin in laquer thinner
2003-09-27 by Stefan Trethan
good idea - i googled the name and didn t find them.. but the page isn t that great i would say... thanks for your search anyways... i tried the staedtler pens
Re: colophony resin in laquer thinner
2003-09-27 by Dave Mucha
Google the phone number 800-435-2931 www.gcwaldom.com Didn t find pens though. didn t Staedler have suppliers around the world ? seems an office supply
Re: [Homebrew_PCBs] colophony resin in laquer thinner
2003-09-26 by Stefan Trethan
thanks... but i won t call there.. you know this is around the globe and would cost much more than the pen itself. i also doubt they know which tip the pen
Re: [Homebrew_PCBs] colophony resin in laquer thinner
2003-09-26 by Don Perry
I have a what looks like a brand new GC catalog right here in my hand. It says 1-800-435-2931 customer service. A division of GC thorsen Inc. 1801 Morgan
Re: [Homebrew_PCBs] colophony resin in laquer thinner
2003-09-26 by Don Perry
My acid of choice is ammonium per sulfate, not ferric chloride. I just happen to have a radio shack down the road owned by a friend.
Re: [Homebrew_PCBs] colophony resin in laquer thinner
2003-09-26 by Stefan Trethan
i fear i can t get exactly that one, thus i am asking.. (not even know what gc electronics is...) do they have online descriptions of products? st
Re: [Homebrew_PCBs] colophony resin in laquer thinner
2003-09-26 by Don Perry
The pen from GC electronics Cat # 22-222 is black with 1/64 tip. Not sure just what the tip might be, but its not metal. They do dry out easy, so be sure to
Re: [Homebrew_PCBs] colophony resin in laquer thinner
2003-09-26 by Stefan Trethan
and it has nylon tip? or felt? or metal? thanks st
Re: [Homebrew_PCBs] colophony resin in laquer thinner
2003-09-26 by Don Perry
I have the plotter running - slow. And I always add angle to each 90 deg trace in the artwork. A short trace placed in the inside corner of each trace. The
Re: [Homebrew_PCBs] Re: Toaster oven reflow for SMT devices
2003-09-26 by Don Perry
I seem to recall using circuit resin cleaner to get the oil off after. I heated the oil in a shallow pan, and put them in and out with hot dog tongs. These
Re: [Homebrew_PCBs] Re: Toaster oven reflow for SMT devices
2003-09-23 by Stefan Trethan
glue instead of solder is not holding down smd components glue. the smd glue i know is white or red, and if you want to replace a component brute force or a
Re: Toaster oven reflow for SMT devices
2003-09-23 by ghidera2000
I ve seen a glue in the electronics stores that is supposed to be used instead of solder. No idea how well it works but, I don t imagine you can remove the
Re: [Homebrew_PCBs] Re: Toaster oven reflow for SMT devices
2003-09-22 by kenneth magers
i beleave that there is a specieal glue that is used for holding these down i have used pin head sized drops of super glue gell just make shure in a well
Re: basic basics of boards
2003-09-22 by Dave Mucha
... ... OK, My friend has been around a long time and has pretty much done it all. Says the square pad on a 2 pin is ground. That s where
Re: basic basics of boards
2003-09-22 by ghidera2000
... schematics ... Me Three :D ... IFAIK no, just 1/32, 1/16. whatever is the smallest size your parts will easily fit into. Probably 1/16th would be the best