Homebrew PCBs

Diazo! <http://www.amazon.com/Speedball-Diazo-Photo-Emulsion/dp/B0011YTZ9G/ref=sr_1_2?ie=UTF8&qid=1364002783&sr=8-2&keywords=diazo+emulsion>

Donald.
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----- Original Message -----
> From: "Rick Sparber" <rgsparber@...>
> To: "Homebrew PCBs" <Homebrew_PCBs@yahoogroups.com>
> Sent: Friday, March 22, 2013 8:25:15 AM
> Subject: RE: [Homebrew_PCBs] Re: etching the OD of a cylinder to create a graduated dial
> Harvey,
> 
> Pantographs and lasers are all existing technologies. My hobby is to
> invent
> new things, especially things that are simple. So if I could apply
> some
> homemade mixture to the cylinder, do a contact print, and then etch, I
> would
> be happy.
> 
> Rick
> 
> -----Original Message-----
> From: Homebrew_PCBs@yahoogroups.com
> [mailto:Homebrew_PCBs@yahoogroups.com]
> On Behalf Of Harvey White
> Sent: Thursday, March 21, 2013 1:29 PM
> To: Homebrew_PCBs@yahoogroups.com
> Subject: Re: [Homebrew_PCBs] Re: etching the OD of a cylinder to
> create a
> graduated dial
> 
> On Thu, 21 Mar 2013 11:18:29 -0700, you wrote:
> 
> >Andrew,
> >
> >I know that photo etching has been done on flat plates so assumed it
> >could be made to work on a cylinder. I would wrap the artwork around
> >the cylinder and rotate it at a constant rate under the UV light. The
> >missing link here for me is an easy to apply photo resist. I've
> >always
> >used pre-treated circuit board material and had good results.
> >
> >One option I may pursue would be to coat the cylinder with wax and
> >then
> >use engraving techniques to scribe through only the wax. In this way,
> >mistakes can be fixed by reflowing the wax. Not sure how to do the
> >numbers. This method probably would work but is too much effort for
> >me.
> >If a spray-on photo resist could be made to work, that would be the
> >key.
> 
> Try a pantograph and larger patterns to engrave the numbers. Another
> option
> would be Laser engraving. You need to rotate the cylinder and move
> perpendicularly to the axis. Same thing for normal engraving.
> 
> Might be worth the effort.
> 
> Harvey
> 
> 
> 
> 
> ------------------------------------
> 
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> 
> 
>