Woodworking hand saw filing saw method What is the method

1, left and right called "on the open teeth", broken into a very small saw road, used to cut across the tenon and pull the shoulder, known as the "bite shoulder saw.

2, left, center and right called "1 fixed 2 open teeth" broken into a large saw road, used for wet wood cut off the saw, sawing down the board, curve saw.

3, left center right called "2 fixed 2 open teeth" broken into the middle of the saw road, used for dry wood cut off sawing, sawing, mortise and tenon saw.

4, at the same time combined: cut off the saw with 85-degree backward tooth shape, saw with 93-degree front punch tooth shape, cut off the smooth dual-use saw tooth front edge and saw vertical 90-degree tooth shape.