Welcome to our site! EDAboard.com is an international Electronic Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
firstly you must know the what is the manufacturers tolerance?after you must set the this tolerans in your design rule check.
an example; if the manufacturer say that 'i can 4 mil hole size' now you must the set your hole size 4 mil(min).
I suggest you to have DFM check for your PCB design. DFM methodology helps designers incorporate manufacturing knowledge during the initial design process, preventing design errors early in the design process and reducing the need for costly corrections later. At present we have free DFM software’s offered by few PCB manufacturers which is of great help to PCB designers. Recently one of my friends mentioned the Sierra Proto Express site, where they have an online tool to check DFM for PCB designers. Has anyone here tried it out?
now a days fabricators are capable for making PCB with 5/5 mils (trace width\clerance) and minimum hole dia of 8 mils.
if you can design a PCB with 8/8 mils (trace width/clearance) it will not make any farication issues
I agree with Nikhil. But it's always better to have a DFM check because if you think your design has minimum trace of 6 mils, and you run through DFM check, it will highlight any areas where the traces are 5 mils. New DFM methodology helps designers incorporate manufacturing knowledge during the initial design process, preventing design errors early in the design process and reducing the need for costly corrections later.
All depend the DFM how difficult the job is. Very fine features increase the risque of shorts. Also, this depend on what kind of process we use to manufacture the ccts.
the board are not cleaned properly before and during DES line, debries left on the board cause shorts after pattern plate. However, we are able to identify those issues in AOI and BBT and scrap the boards.