Gaby,

There is an IPC specification 7525 which is a Stencil Design Standards.
I do not know of a standard that establishes a standard for corner
radius due to stencil manufacturing processes.  You may want to talk to
your stencil supplier about there capabilities.  

Bill Coleman at Photo Stencil is the Chairman of 7525 so maybe he can
give you more specifics.  His email is [log in to unmask] .

If you are going to be at APEX next week Bill will be there plus I
believe there is a committee meeting for 7525 as well.

Russell Nowland
Alcatel-Lucent           
Supply Base Engineer
Address: 14000 Quail Spring Parkway, Suite 300
Oklahoma City, OK 73134
email: [log in to unmask]
Desk: 405-302-1660
Cell: 405-203-0034
Fax: 405-302-1622

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Gabriela Bogdan
Sent: Thursday, February 15, 2007 9:19 AM
To: [log in to unmask]
Subject: [TN] stencil apertures

Dear all,

Could you tell me if there is a standard for stencil apertures CORNER
RADIUS?
I look for indications or requirements coming from people with hands on
experience regarding differences between the manufacturability of
stencils with all methods (etching, laser, electroforming) as well as
best solder paste release quality.
I am also interested in aperture optimization for lead free pastes. 

Gaby

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