Having started out as a CAM tech at a PCB fabricator I have a high degree of confidence in the software that is used at the FAB houses and their ability to use the power I'm giving them responsibly.  I've never had a problem with a defect related to the addition of fillets at the fab house.  Most of the data/image related defects I've seen from fab shops have more to do with inadvertent deletion of traces or pads, missing solder mask clearances, or incorrectly sized holes.  

Putting the allowance right on the print allows the fabricator to add fillets if they feel they need them without stopping the job to ask and potentially missing the delivery schedule.  I see your point, and don't completely disagree with it.  However, I think board shops are more likely to deliver a good quality product on time and for a reasonable price if they feel I'm working with them rather than waiting to pounce on them if they screw up. 
  
If the board shops you are working with can't be trusted to meet their published capabilities, it might be time to look for new ones.


----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Peter G. Houwen
Sent: Friday, March 20, 2015 10:23 AM
To: [log in to unmask]
Subject: Re: [DC] Question of the Week - Teardropping

If you have sufficient annular ring, why allow the fabricator to add fillets?

I've always believed that fabricators should never be given up front permission to modify gerbers.  If they have a reason to make a mod, I want them asking, so I know what and why.  If nothing else, it helps me monitor their actual vs. advertised capabilities.



______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please contact helpdesk at x2960 or [log in to unmask] 
______________________________________________________________________




---------------------------------------------------------------------------------

DesignerCouncil Mail List provided as a free service by IPC using LISTSERV 16.0.

To unsubscribe, send a message to [log in to unmask] with following text in

the BODY (NOT the subject field): SIGNOFF DesignerCouncil.

To temporarily stop/(restart) delivery of DesignerCouncil send: SET DesignerCouncil NOMAIL/(MAIL)

For additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815

---------------------------------------------------------------------------------