Homebrew PCBs

Ms. Smilingcat,

If you want to talk metalworking, that is my primary hobby (since
electronics was lost as my hobby when I started to get paid to do it back in
1973). I have a RF30 mill, and Atlas/Craftsman lathe, homemade drill press
and shaper from my own castings, plus lots of homemade hand tools. But this
is OT so contact me directly. I look forward to hearing from you. 

Rick

-----Original Message-----
From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com]
On Behalf Of smilingcat90254
Sent: Tuesday, January 08, 2013 8:29 PM
To: Homebrew_PCBs@yahoogroups.com
Subject: [Homebrew_PCBs] Re: photo resist. Slightly different material.

Yes E-bay is cheaper.

At Capefear, cost for 10' x 24" film is $59.00 with S/H I think it was. they
have much smaller size for sampling but it is pretty pricy!! $19 for 12" x
24". 

I pay premium over E-bay because I prefer to have a "regular" supplier. It's
the reason I order from DigiKey, and buy Tektronix and HP equipment. 

My sample order from Capefear came very prompt. Well packed, looking very
reputable. 

I do not care for grey market items or suppliers where you can't trace back.


As a reference of how I view things: Some of my cutting tools are cobalt
steel with TiN coated material. Not some high carbon steel. Tools
themselves, I prefer Dewalt, Bosch, Makita... Prefer it is MADE IN USA or
Germany or Japan and not just the label saying USA/German/Japanese company.
Most recent outburst was over 6-32 tap. Ordered a replacement tap. Broken
one was a cheapie from Craftsman high carbon steel. Flute on the tap was cut
so irregular, one of the cutting surface was less than 1/32" wide.
Replacement is a cobalt steel, TiN coated 6-32 H3 tap from Ghurring. cost is
about $15.00 each.

Been looking for a lathe and mill and I think I'm going to invest in Taig.
Not so hot on Smithy or Grizzly. Both are not that accurate. I used Smithy
and wasn't impresed. Even their technical spec was bit of a yawn. 

smilingcat,

--- In Homebrew_PCBs@yahoogroups.com, "Jeff Heiss"  wrote:
>
>  
> http://www.polymetaal.nl/siteUK/shopukwork/en-gb/dept_183.html
> 
>  
> 
> The price is on the bottom of the page.  The cost is 24" x 10' for $78 
> (60 Euro).  It costs 5.4 times as much as photoresist available on 
> Ebay.  I computed 5.4x using the resist I purchased which is 8.3" by 
> 9.7' DuPont
> MM540 for $14.49.
> 
>  
> 
> Jeff
> 
>  
> 
>   _____
> 
> From: Homebrew_PCBs@yahoogroups.com 
> [mailto:Homebrew_PCBs@yahoogroups.com]
> On Behalf Of Rick Sparber
> Sent: Tuesday, January 08, 2013 8:40 PM
> To: Homebrew_PCBs@yahoogroups.com
> Subject: RE: [Homebrew_PCBs] photo resist. Slightly different material.
> 
>  
> 
>   
> 
> Ms. Smilingcat,
> 
> It looks like very interesting stuff. What bothers me is they said 
> "affordable price" yet don't list the price. That usually means it 
> ain't that affordable. So what DOES it cost?
> 
> Rick
> 
> -----Original Message-----
> From: Homebrew_PCBs@yahoogroups.com
> [mailto:Homebrew_PCBs@yahoogroups.com
>  ]
> On Behalf Of smilingcat90254
> Sent: Tuesday, January 08, 2013 6:13 PM
> To: Homebrew_PCBs@yahoogroups.com
> Subject: [Homebrew_PCBs] photo resist. Slightly different material.
> 
> Some of you have complained that the resist lifts off or gets damaged 
> during handling. laying of the transparent image, static electricity 
> causing the resist to lift off with the image, vacuum bagging causing 
> more surface scratch and so on.
> 
> and the use of chemicals.
> 
> I just recently ordered a material called puretch from only US
distributor.
> claims that the film is good down to 1 mil resolution provided your 
> image is that good.
> 
> links to the US distributor: www.capefearpress.com/puretch.html
> youtube videos on the product: www.youtube.com/watch?v=xkGt9nFER1s
> 
> another link:
> http://www.polymetaal.nl/siteUK/shopukwork/en-gb/dept_183.html
> 
> Developer used is sodium carbonate (do not get it confused with sodium 
> bicarbonate which is baking soda)
> 
> capefear press has some good information on how to expose without 
> creating shadows and the lamp recommended. Good solid information. 
> Application at capefearpress is not electronics but rather arcane art 
> form. Far more technical than most of us here or using toner transfer
method.
> 
> Some advantages: photoresist is protected from handling by a thin 
> plastic layer. It is removed when you are ready to develop so that you 
> can't scratch or lift off during handling and exposing.
> 
> For photoimaging, they also sell stoufer exposure gauge to help you 
> get the right exposure.
> 
> ------------
> For now I think I have Pulsar toner transfer system working well enough.
> Don't need to use lot of pressure. Too much pressure causes the toner 
> to "bleed" on the edges. temperature to melt toner is around 100C 
> anything more and the toner becomes too thin and the image "bleeds"/run.
> 
> I may still switch over to puretch. Don't need to keep printing images 
> for multiple board. higher resolution for use with TQFP with 0.5mm 
> pitch. Pulsar is near the limit for 0.5mm pitch.
> 
> ------------------------------------
> 
> Be sure to visit the group home and check for new Links, Files, and
Photos:
> http://groups.yahoo.com/group/Homebrew_PCBsYahoo! Groups Links
> 
> 
> 
> 
> 
> [Non-text portions of this message have been removed]
>




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