Homebrew PCBs

Really good information


Sent from my iPhone

On Jan 8, 2013, at 10:25 PM, "Jeff Heiss" <jeff.heiss@...> wrote:

> I have a Pan American Tool cobalt drill set. Like yours, real cobalt steel,
> not Chinese stuff, but not TiN coated. What brand of drills do you have?
> 
> Tektronix over Agilent and Lecroy? Just kidding;)  
> 
> Jeff
> 
> _____ 
> 
> From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com]
> On Behalf Of smilingcat90254
> Sent: Tuesday, January 08, 2013 10:29 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]
> >
> 
> [Non-text portions of this message have been removed]
> 
> 


[Non-text portions of this message have been removed]