Re: [Homebrew_PCBs] Burning Laser CNC
2009-01-20 by Russell Shaw
... Hi, What precautions are needed for eye protection against stray reflections?
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Re: [Homebrew_PCBs] Re: Electroplating and VIAs
2009-01-20 by Simao Cardoso
I have just remembered other thing, once i read from some already dated IPC documents, a way to activate the holes, beautiful for it simplicity. Not much info
Re: [Homebrew_PCBs] Re: 50.000rpm pcb spindle idea
2009-01-20 by Simao Cardoso
Isn t a desire of my own, from pcb laminates datasheets you can read recommended drill bit speeds. It is about 100.000rpm for an 0.25mm to 10.000rpm for 4mm.
Re: 50.00rpm pcb spindle idea
2009-01-19 by lcdpublishing
I can understand and appreciate your desire for speed, however, there are many drawbacks to this speed as well. Heat is going to be a problem - keeping the
Re: [Homebrew_PCBs] Re: Electroplating and VIAs
2009-01-19 by Simão Pedro Cardoso
I have operated a plating pcb line in the past. The people there just buy a box of chemicals from a supplier and made the boards. The chemical supplier just
Re: [Homebrew_PCBs] 50.00rpm pcb spindle idea
2009-01-19 by JanRwl@AOL.COM
Find a suitable-size/torque 400 Hz. 3-phase motor . Re-do the output end with a suitable precision angular-contact ball-bearing rated for 30,000 RPM, and
Re: [Homebrew_PCBs] 50.000rpm pcb spindle idea
2009-01-19 by Simão Pedro Cardoso
There are 40.000rpm brushless motors with water cooling and controllers at less than 100eur from any RC store. But these small motors need 30-40A and so they
Re: [Homebrew_PCBs] 50.00rpm pcb spindle idea
2009-01-19 by Stefan Trethan
Personally i think a direct drive brushless motor is the way to go for these speeds. Also i think you need to pre-load the bearings to reduce runout. And i
50.00rpm pcb spindle idea
2009-01-19 by Simão Pedro Cardoso
Hi, Is very difficult to find a pcb spindle. Drilling a pcb hole of 0.5mm in a FR4 laminate needs carbide tools and 50.000rpm spindle. This things cost more
Re: [Homebrew_PCBs] Burning Laser CNC
2009-01-19 by Steve Wiseman
... Indeed, I d like to have a play, but can t quite face the yellow fingers of etching. Problem is, these days, it s too easy for me to just mail the gerbers
Re: [Homebrew_PCBs] Burning Laser CNC
2009-01-19 by DJ Delorie
... It would be interesting to see how the laser interacts with various types of spray paint - lacquer, enamel, acrylic, etc - both with respect to burnability
Re: Burning Laser CNC
2009-01-19 by Juan EA7FNJ
Yes, that s right. That is my idea: use the DVD laser to expose or burn the resist off. I don t know if I paint with some black ink a copper board and try to
Re: [Homebrew_PCBs] Burning Laser CNC
2009-01-19 by Steve Wiseman
... I think Juan s contemplating burning the resist off, rather than exposing it. I ve got a 25W CO2 laser marker, (google synrad fenix) but no etching gear
Re: [Homebrew_PCBs] Re: Electroplating and VIAs
2009-01-19 by Markus Zingg
Juan, How to use it greatly depends on the chemistry used. The chemistry even defines howmany tanks you need, wether they are heated, the processing parameters
RE: [Homebrew_PCBs] Re: Burning Laser CNC
2009-01-19 by Jerome Decock
It cannot burn copper because of reflection, laser is light and copper is shiny. I have seen some people trying to paint the copper with black heat conductive
Re: Burning Laser CNC
2009-01-19 by Juan EA7FNJ
Thanks for the answer. Well, a CO2 laser can engrave the copper directly (I think). But It s so much more expensive than a DVD-RW laser. How does a CO2 laser
Re: [Homebrew_PCBs] Burning Laser CNC
2009-01-19 by Mark Robinson
... A laser from a DVD burner should be quite adequate to expose photoresist. I played around with large argon lasers and scanners as a means of resist
Re: Electroplating and VIAs
2009-01-19 by Juan EA7FNJ
Hi guys! Ok, great machine! but, I can see how to make one but, where is the manual how to use it ? xD
Re: Electroplating and VIAs
2009-01-19 by Steve
Have you checked the Links under Plated Through Holes yet? Not many links there, but it is something. Markus Zingg s page on through hole plating has been
Re: [Homebrew_PCBs] abcfab out of business
2009-01-19 by Wayne Topa
... Very strange. I did a search on Ebay Stores for abcfab and Ebay came back with No abcfab found in Stores . I m glad he is still in business and hope that
Re: ripple effect?
2009-01-19 by Steve
What was your light source? With the board not flat, perhaps light leaked under. How do you make the transparency? Do you print mirror image and place it image
Re: Need a single-side prototype board made
2009-01-19 by Steve
I see someone hijacked your thread. Please, people, when starting a new thread, don t do so by replying to another message. Even when you delete all traces of
Re: [Homebrew_PCBs] Electroplating and VIAs
2009-01-19 by J Deringer
There are several methods to choose from, here s a video demonstrating one of them. Pay close attention to safety instructions. This should give you an idea of
Burning Laser CNC
2009-01-19 by Juan EA7FNJ
Hi guys! I ve seen this: http://c4r0.skrzynka.org/_hv/index.php?page=lasers/cnc2 I was thinking: why don t use this kind of laser to burn the photoresist
Electroplating and VIAs
2009-01-19 by Juan EA7FNJ
Hi guys! I d like to make the vias of my board and I think the best method is electroplating. But, I was looking for some information about it, and I didn t
Re: [Homebrew_PCBs] abcfab out of business
2009-01-19 by Paul Playford
http://stores.ebay.com/PCB-Laminates-Copper-Clad de Paul, W8AEF ZF2JL/ZF2TA FO8DX/FO8PLA 8Q7AA XZ0A VU7RG TX5C ... From: Wayne Topa
Re: abcfab out of business
2009-01-19 by n6tdt
I am still able to get to his store http://stores.ebay.com/PCB-Laminates-Copper-Clad_W0QQsspagenameZL2222QQtZkm Dan
Re: [Homebrew_PCBs] abcfab out of business
2009-01-19 by toddroberts2001@aol.com
In a message dated 1/18/2009 8:30:32 P.M. Eastern Standard Time, linuxone@intergate.com writes: Hi Guys Am in need of some thin pcb boards and checked Ebay
abcfab out of business
2009-01-19 by Wayne Topa
Hi Guys Am in need of some thin pcb boards and checked Ebay for abcfab. He is no longer listed as an Ebay store. Has anyone found any suppliers as goo as he
Re: solder paste stencils
2009-01-19 by derekhawkins
... This would be commercial stencil thickness x the area of the SMD pad. You can calculate pad areas from data sheets. In your case it would be stencil
ripple effect?
2009-01-16 by Paul Newman
Have just posted a picture under vk4apn. There is a noticable ripple effect on the straight lines. The image was crisp and straight and made using vacuum
Re: [Homebrew_PCBs] solder paste stencils
2009-01-16 by James Bishop
I ve soldered a couple of qfn s by simply laying a sausage of solder paste in a line across all the pads, and then reflowing in an old frying pan on my gas
Re: laser printer recommendation ?
2009-01-16 by tomservo_9504
Bit of a stale thread but I ll throw in my 2c... I ve had some experience with a number of Lexmark laser printers (NOT inkjets) that were more than
[Homebrew_PCBs] solder paste stencils
2009-01-16 by Mark Lerman
I m working with some QFN leadless components and I want to make solder paste stencils to apply solder paste before putting them in my toaster oven reflow
Re:Double to single sided board
2009-01-14 by Lee Studley
You could paint the unused side with clear lacquer or polyurethane, etch the trace side, then make an isolation drill bit. Where ever you need a through-hole
RE: [Homebrew_PCBs] Double to single sided board
2009-01-14 by Malcolm Parker-Lisberg
Kurt Don t overheat as you are more likely do damage the laminate surface on the side you are removing copper from than the underside. If you get it too hot
RE: [Homebrew_PCBs] Double to single sided board
2009-01-14 by Kurt
Thanks Malcom, I will give that a try... it does not affect the opposite side copper? I always wanted to be an anonymous type anyway, thay are mostly gone,
Re: [Homebrew_PCBs] Double to single sided board
2009-01-14 by Malcolm Parker-Lisberg
Heat one corner with a hot air paint stripping gun so that you lift enough copper to be able to grab it with the pliers. Clamp one end firmly, apply the heat
Double to single sided board
2009-01-14 by Kurt
I was wondering, I have a pretty good stash of double sided board, but very little single sided. I have been using Eagle to design my boards so far, and for
Re: [Homebrew_PCBs] Harbor Freight drill bits
2009-01-12 by DJ Delorie
... I ll take any of the 13 s (#80) and 14 s (#79) you d otherwise discard. I use those the most. Or you could do what I do, and use those for through vias -
Harbor Freight drill bits
2009-01-12 by jerrytr2.com
Hello, I just bought two packs of 50 PC drill bits from Harbor Freight tools. $10/kit, plus shipping, plus California sales tax. So for about $30, I have 100
Re: laser printer recommendation ?
2009-01-12 by jerrytr2.com
... versions *** I too have a 1020, but I use it for printing checks. It has started leaving a fuzzy vertical band down the R/H portion of the page. I pulled
Need a single-side prototype board made
2009-01-12 by Rick Henry
It s been prob 30 years or more since I did any PCB design and etching and I really don t want to get back into all the stuff just to check a single design. I
Re: laser printer recommendation ?
2009-01-10 by Paul Newman
Many thanks to those that replied - all useful info and links. I recently bought a new injet as a general printer Canon mp610. I thought i would see how well
Re: laser printer recommendation ?
2009-01-07 by vk4tsc
... Paul, This shadowing, blotching and double-up printing usually means that the drum unit is past its use-by date. The cleaning blade used to remove excess
Re: [Homebrew_PCBs] Shelf life of HCl/H2O2
2009-01-06 by kabowers@NorthState.net
... As to hydrometers; it might cut down on mess to remove the bobber from the tube and just drop it into the container and leave it there all the time. It
Re: laser printer recommendation ?
2009-01-06 by pgdion1
... time for a new laser. I use ... I like the HP printers best myself (for Laser Printers). We have 8000 series at work and they are decent but personally I
Re: [Homebrew_PCBs] laser printer recommendation ?
2009-01-06 by John Coppens
On Tue, 06 Jan 2009 06:52:34 -0000 ... Did you change the cartridge? After changing the cartridge ir s nearly impossible that those problems remain.
Re: [Homebrew_PCBs] Shelf life of HCl/H2O2
2009-01-06 by DJ Delorie
... Well, that s what I did. ... Assuming you re using 37% HCl and 3% H2O2, it s two parts H2O2 and add one part HCl (always add acid to water, not the other
Re: [Homebrew_PCBs] Shelf life of HCl/H2O2
2009-01-06 by Stefan Trethan
This is the one i bought: I wish it had a scale just for specific gravity, down to 1.0. I