When I thumb thru my specs I usually smear my lenses. Overlooking that transparent attempt at humor, a basic profile tolerance of 0.015" for a routed out assembly is the best you should ask for. With this in mind, if you needed to keep pads 0.025" from the edge, your design s/b 0.040" from the edge.

The Supplier's target on the max dimension with the 0.015" profile tolerance is going to then have a ± tolerance of 0.0075". Most Suppliers want ± 0.010".

Dewey 

 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Kuczynski, Michael (H USA)
Sent: Wednesday, November 09, 2011 1:27 PM
To: [log in to unmask]
Subject: [TN] Tolerances for board and pads

 

While I go thumb thru my spec's, could anyone provide the following:

 

1) what is the REASONABLE tolerance for a PCB outline for a vendor to

hold? (board I'm working on is 10.85mm x 12mm, with a 4.5mm x 3.9 notch

taken out)

 

2) what REASONABLE tolerance can be held for copper pads to the board

edge?

 

thanks in advance

 

SIEMENS 

Michael Kuczynski     Healthcare Diagnostics Inc. 

Product Eng. II CID   511 Benedict Ave. 

914-524-3118 (Ph)     Tarrytown, NY 10591 

914-524-3322 (Fax)    Mail Stop P25-1-C 

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