Homebrew PCBs

On Sun, 19 Feb 2012 03:20:30 -0000, you wrote:

>Joe, I think your results are more the exception than the rule.  I have been able to get down to 8mil traces with the Pulsar paper, and just as good with the HP Presentation paper.
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>The problem with the photosensitive steps is there are just too many chemicals and steps involved for it to be quick.
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>And, I agree with Harvey, run the board and paper sandwich through the laminator several (8-12) times then immediately into a warm water bath to release the paper from the toner.
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>The only real problem I had with the Pulsar was the stretch...I use a cnc mill to drill holes before laminating and the holes don't line up so well.  Luckily the stretch is mostly in the long direction of the paper.

One reason why I have not tried CNC drilling and then TT transfer.
When I do 0.5mm 100 lead VQFP packages and small vias, any
misalignment, top and bottom, let alone holes in the vias, is a bit
too much.

Harvey


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>--- In Homebrew_PCBs@yahoogroups.com, joe M <joe9mail@...> wrote:
>>
>> Mark, I had better luck with the photosensitive process than the toner
>> transfer process. I tried all kinds of paper from magazine paper, HP
>> Presentation paper, to photo paper, without much luck.
>> 
>> What is the size of your traces? I could get 15mil with photoetching, which
>> I could not with toner transfer process.
>> 
>> I want to try the cnc approach some time. What machine did you use?
>> 
>> Joe
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>> On Sat, Feb 18, 2012 at 11:22 AM, RL <rlrc2003@...> wrote:
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>> > **
>> >
>> >
>> > I had just purchased some Toner Transfer paper from Pulsar.
>> > Do any of you have any suggestions on the type
>> > of printer that you have had good luck with this product?
>> > I saw some one used a samsung laser 1200x1200 dpi with reg.
>> > photo paper. Any one else with sug?
>> > And any other tips on this product would be helpful.
>> > I tried the CNC way for a few weeks now, but there are to many
>> > problems, when dealing with such small traces.
>> > Thanks,
>> > Mark
>> >
>> >  
>> >
>> 
>> 
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