Homebrew PCBs

Roger, you need to send these to the list address, not the
listowner address.

Steve, listowner

--- ralucas4277 <ralucas4277@...> wrote:

> Date: Wed, 02 Feb 2005 13:28:06 -0000
> From: "ralucas4277" <ralucas4277@...>
> To: Homebrew_PCBs-owner@yahoogroups.com
> Subject: Re: Scratch & Etch
> 
> 
> 
> I have been having some success in using Electrolube PRP
> (positive 
> photo resist) in scratch and etch, (resistant to FeCl). I could
> never 
> get PRP to expose to uv consistently so I used the old tin to try
> 
> scratch and etch. No skill is required to spray the PRP (unlike
> for 
> uv exposure), and the coating acts a flux and track protection.
> 
> The coating scratches nicely without flaking, and I have
> consistently 
> etched various track widths from 0.6mm down to 0.2mm (100mil).
> 
> I am currently experimenting with various scratch tool forms to
> use 
> in the cnc as a possible replacement for isolation milling. 
> Scratching is quicker and quieter than routing, and overall
> cheaper 
> in raw materials.  
> 
> Will report on the tool form(s) when I have more info.
> 
> Note, I initially tried using a hot iron to cut through the PRP,
> but 
> this left a variable waxy deposit on the tracks and gave poor
> etching.
> 
> Regards
> Roger
> 
> 
> 
> --- In Homebrew_PCBs@yahoogroups.com, "onenastyviper" 
> <oneNastyViper@h...> wrote:
> > 
> > Thanks to all who replied.
> > I connected the plotter and it does work...Yay.
> > Next items/questions/ideas burning holes in my brain...
> > Is this Dykem(sic) Blue availble in the UK (any alternatives?)
> > How safe is it?
> > I have had an idea to try maplin pcb lacquer as the scratch 
> coat...is 
> > pcb lacquer ferric chloride etch safe?
> > 
> > regards, PK
> 
> 
> 
> 
> 
> 
> 


=====
Steve Greenfield               // Digital photography, scanning,
Polymorph Digital Photography // retouching, and photomorphing
253-318-2473 voice           // to your specs.
polymorph@...     // 
http://www.polyphoto.com/  // Based in Tacoma, WA, USA

Please send to homebrew_pcbs@yahoogroups.com , not to
homebrew_pcbs-listowner@yahoogroups.com

Steve

--- ralucas4277 <ralucas4277@...> wrote:

> Date: Wed, 02 Feb 2005 11:31:52 -0000
> From: "ralucas4277" <ralucas4277@...>
> To: Homebrew_PCBs-owner@yahoogroups.com
> Subject: Re: Scratch & Etch
> 
> 
> 
> I am having some success with scratch and etch using spray on 
> positive photoresist from Electrolube - PRP. I had some left in
> an 
> old tin, which I could never get to expose consistently under uv.
> For 
> scratch and etch the sprayed on coat thickness and quality is 
> unimportant, and the PRP can be left after etching for flux and
> track 
> protection. This scratches very cleanly without flaking and I can
> 
> consistently etch scratches of 0.2mm (100mil).
> 
> I am currently investigating the best scratch tool to substitute
> for 
> mechanical milling on the cnc, in a variety of widths. Scratching
> is 
> faster and quieter than routing.
> 
> Regards
> Roger  
> 
> 
> --- In Homebrew_PCBs@yahoogroups.com, "onenastyviper" 
> <oneNastyViper@h...> wrote:
> > 
> > Thanks to all who replied.
> > I connected the plotter and it does work...Yay.
> > Next items/questions/ideas burning holes in my brain...
> > Is this Dykem(sic) Blue availble in the UK (any alternatives?)
> > How safe is it?
> > I have had an idea to try maplin pcb lacquer as the scratch 
> coat...is 
> > pcb lacquer ferric chloride etch safe?
> > 
> > regards, PK
> 
> 
> 
> 
> 
> 
> 


=====
Steve Greenfield               // Digital photography, scanning,
Polymorph Digital Photography // retouching, and photomorphing
253-318-2473 voice           // to your specs.
polymorph@...     // 
http://www.polyphoto.com/  // Based in Tacoma, WA, USA