Top-Jointing. With the saw clamped teeth up, joint it by running a file along the tops of the teeth, as shown by Fig. 80. This is done to bring all the teeth to the same height, and also to maintain the form of the saw, which, along the line of the teeth, should be slightly convex. The jointing should leave a small facet on each tooth, which will be rectangular in a ripping-saw and triangular in a cross-cutting-saw.