David,
I have one more challenge before I can rest: toner transfer to a cylinder. Then I can cut off a 1/4" length of copper pipe, press fit it around a steel hub, and etch a scale into the perimeter. I plan to preheat the copper+steel and then make a single pass over the wax paper. Etching should not be a problem. I just need to make a fixture to keep it all aligned.
Rick
On Aug 12, 2013, at 12:39 AM, David Pickering <satdaveuk@...> wrote:
> Hi Rick
> Just got back from holiday
> Nice to here you had success
> If your gettng away with 15 mins in the freezer then all the better.
> Did a quick PCB for a project before I went away and again all went well apart from 3-4 small pin holes needed dotting with pen.
> Its worth mentioning on here that DIY PCBs as we do here with basic equipment will never be as good as manufactures, However the finshed PCBs we can produce are very good, usable and perfect for a one off protyping.
> The plus side is your producing it within a hour, and providing you have the parts to populate the board often the project can be up and running within the same day or over a weekend.
> Regards
> Dave
>
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> ________________________________
> From: Rick Sparber <rgsparber@...>
> To: Homebrew_PCBs@yahoogroups.com
> Sent: Friday, 9 August 2013, 4:07
> Subject: RE: [Homebrew_PCBs] Re: Easy Fast Laser Print DIY Circuit Boards - Dave's toner-transfer freezing technique
>
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> The special waxed paper came in WAY ahead of the promise date - got it today. Wonderful material! I drafted a 1" long scale with 10 major and 30 minor divisions on it using DesignCAD V14. It was then printed, mirror image, onto the wax paper. I printed 4 coupons at a time. Two of these coupons were taped to 2 small pieces of copper plate.
>
> I ran my copper plates with the waxed paper on top through my laminator 10 times. Then I put the samples in the freezer for 15, not 30 minutes. The paper fell away from the toner. Then I dropped the two samples in rather used up ferric chloride that I put out in the Arizona sun. Every 15 minutes I would bump the container. After an hour I pulled out the samples. The toner was solid and I had etched down about 0.001" according to my caliper. The fine lines of the scale and numbers all looked perfect.
>
> My last small challenge is figuring out how to color the background and leave the raised copper areas shiny. I tried coating the entire surface and then abrading the raised area. Didn't do a very good job but the technique shows promise.
>
> IMG_1203.JPG
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> Thanks for the great procedure Dave,
>
> Rick
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