ahah! i see it. so lots of meat in the tenon if we calculate D from the diameter of the bolt. reading at work - thinking effected by metal desk.
now it is calculating wind lift on the porch roof - would this be divided by 3 if there are 3 post to plate joints?- deciding whether 1 or 2 pins (people up here in northern ontario are using 2 there) then dividing the lifting load per joint by 1 or 2, determining the proper sized metal bolt in the tables to bear that load, then using that diameter to set the wooden pin spacings...
i have a feeling there is a translation between materials here that speaks to a impasse between objectifying and traditional forms of knowledge.
