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dual diameter hole in 15.7 ? Backdrilling?

stump1019

Anyone had the opportunity to attempt a dual diameter pressfit connector hole utilizing Allegro 15.7? I have an 18 layer board that layers 1-14 are to be 22.3 mils and layers 15-18 are to be 10 mils in diam. Signal layer pad diameters differ based on the drill size, I started with a 10 mil drill thru hole and want to utilize back drilling to acheive the 22.3 mil drill. I havent really used back drilling at all and the documentation really isnt the greatest. I would assume that I could use the BACKDRILL_PRESSFIT_CONNECTOR property to have the stub be the distance from the connector body and the 10 mils could be the plated area with no stub on the bottom. Could I do this? If so what would the values be for the backdrill_pressfit_connector property? Also if anyone has a better idea please feel free to comment.

 

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  • joetasker

     I used backdrill_override to create the data. Apply the property to the pin you want to dual drill. Check it with viewmate or some other gerber viewer software which wil allow you to import drill files. You are attempting to create drill files which will register a double hit, the software does not support this but it can be tricked......j

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  • joetasker

     I used backdrill_override to create the data. Apply the property to the pin you want to dual drill. Check it with viewmate or some other gerber viewer software which wil allow you to import drill files. You are attempting to create drill files which will register a double hit, the software does not support this but it can be tricked......j

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