Unless I'm mistaken:
There are peg to edge of timber standards.
There are peg to end of tenon standards.
These standards help to insure that the relish on the end of the tenon doesn't blow out, and the edge of the post to split as well.
All of these standards help to figure out where to place the peg hole in an ideal situation. But if you have some special considerations like the crack shown in the picture above, your placement may have to vary.
When pegging a through tenon the peg hole is usually 1 1/2" off the shoulder of the tenon so that you can meet the end of tenon standard rule. If the mortise is housed in the post this places the peg hole in 2" off the edge (if housed 1/2").
Sometimes the peg is centered on the tenon, unless it is a very wide tenon as a wide tenon may shrink and lift the tenon up off the bottom of the mortise, and put all the beam's weight on the peg. So in this case the peg should/could be lower so that when the tenon shrinks the gap would be at the top.
I'm not totally sure where you can get a copy of the peg hole spacing standards. But I'm sure someone here can post a link to them.
Last edited by Jim Rogers; 07/20/09 01:49 PM.
