I have yet to get any consistant advice on use of a corner chisel to square up a mortise. I have 3/8″ mortises that will be recieving through tenons. The mortises were cut with a router. I am trying to squaure up the round parts with an Iles 3/8″ corner chisel. I have had mediocre success.
First what is the little protrubance on the chisle edge for? Next one person said I needed a 1/4″ corner chisel. Another person said to use a mortise guage to mark the morises route them and cut out to the lines with a 3/8 mortise chisel. Still another told me to use a chisel and just pare them free hand. The last has been less than stellar. Being through tenons I need neat mortises. To say the least I am confused. I doubt highly I will cut them by hand as I do not have any mortise chisles and they are expensive.