[Lab] Laser cutter precision

[jeanmarc.leblanc at gmail.com]

I am simply planning to make a solder stencil

On , jeanmarc.leblanc at gmail.com wrote:
> can you elaborate on the bump mask? I am curious. a quick google did not  
> reveal any thing.





> I am simply experimenting of a cheap way to solder these LGA chips





> I forgot to cc the lab





> (igoogle does not have a reply all)





> On , Michael Ayukawa mike.ayukawa at gmail.com> wrote:


> That is good stuff. Were you planning on using it as an etch mask?








> Or are you thinking something completely different? People usually use  
> Kapton if they


> plan to retain it as a dielectric layer in the stack. So perhaps you are  
> using this for


> what would be called a "bump mask"?








> You really don't need the high temp properties for wet chemical processes.


> The interface to the Cu is probably more important (etchant can quickly  
> move along the


> interface). We used to use special adhesion promoters and bakes to avoid





> jeanmarc.leblanc at gmail.com wrote:


> I was going to buy this


> http://www.ebay.ca/itm/Kapton-Polyimide-100TAB-E-8-x12-3-Sheets-Free-SH-/370109637919?pt=LH_DefaultDomain_0&hash=item562c40e51f


>  From what I read, that is the metrial that is recommended for this kind  
> of thing and cuts well with lasers
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