I have a pcb symbol which are fingers only for use on flex tails. Is there a way in the symbol editor of Allegro pcb editor version 17.4 which I can create a copper pull-back constraint or keepout.
We have had failures because sometimes copper from a plane extends to the edge of the fingers and causes shorts.
I would like to have a copper pull-back or keepout 8mils in from the edge of the fingers of this symbol.
This can be done.
In the symbol editor load up your part and then go to "Setup Menu > Areas" > "Shape Keepout".
Draw the keepout so that the pins are covered by the shape keepout on the layer you need for example Top.
Next right click on the shape edge so it highlights and select "property Edit"
Lastly, choose the property "Dyn_Clearance_Oversize" and give it a value of 8mils or more.
Save your part.
In the pcb editor when you place the part and have a dynamic copper plane that comes close to those fingers, the plane will back off from the keepout. This back-off is based on the Dyn Clearance Oversize of the shape.
Try it out and see if it works.