The cross sills were laid across the framing floor and inserted underneath the long sills. The long sill was then rolled on top of the cross sills using a tree felling breaker bar and levelled with a bubble level placed on the level station.
The scribed mortice location for mortice No 1 was then scored to prevent grain breakout and then a long handled auger (no spurs) was used to drill out 6 x 6" deep x 1" dia holes.
Four intermediate holes were then drilled using the Stanley ratchet braces fitted with a 1" double spurred auger. This is much faster than the long handled auger.
The mortice nearing completion after chopping out using the morticing chisel and paring with a flat backed chisel.
Mortice No 2 was drilled out using the Stanley ratchet brace to drill all 10 holes.
The connecting pieces between the drilled holes are first chopped using the morticing chisels and then using the paring chisel to cut downwards to enable the connecting pieces to be chopped and levered up / out using with the morticing chisel.
The rounded corners of the mortice are then cut square using a corner chisel (bruzz) [ not illustrated] and then a 2" wide long flat paring chisel is then used to clean out and flatten the sides of the mortice long
A haunch (sloping shoulder) is cut above the mortice to match that present on the cross sill tenon.
Ken Hume - OWG
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Long Sill Mortices