[sglynn]

Is edge margin distance measured from the center of the hole to edge or the perimeter of the hole to edge when checking to ensure minimum distance has been met?

 

[G-force]

Edge of material to the center of the hole.

 

[Pirkka]

Edge of material to the center of the hole.

Ooh... I'd say it depends how your "minumun edge distance" is specified. I have run to rules which measure it from the center of the hole but also rules which define it from the edge of the hole -- needless to say that minimum edge distance requirement is .5 diam. of the rivet different...

I would use only tables for edge distances, which indicate where this should be measured like: http://home.earthlink.net/~gilalex/rivet_spec/rivet_a.htm

 

[SvingenB]

Those tables give the absolute minimum. One should also account for repair with oversized rivets giving a limit of roughly 2. The Jeppeson repair manual say min 2, max 4 and nominal 2.5.