Which type of tooth form is noted for having deep gullets and a zero-degree rake angle?

The type of tooth form characterized by having deep gullets and a zero-degree rake angle is the standard tooth form. This design is particularly effective for a range of applications because the deep gullets allow for efficient chip clearance, which is critical in maintaining a clean cutting edge and ensuring effective cutting operations. The zero-degree rake angle contributes to stability during cutting, providing less tendency to dig into the material being cut and allowing for smoother cutting action.

In contrast, other tooth forms may have different rake angles and gullet geometries suited for specific applications but diverge from the deep gullets and zero rake angle typical of standard tooth forms. For instance, a positive tooth form would feature a positive rake angle, which encourages a more aggressive cut but does not incorporate the deep gullets characteristic of the standard tooth form. Similarly, skip tooth forms and negative tooth forms have their own unique designs that cater to specific cutting needs, but they do not share the same deep gullet and rake angle features as the standard tooth form.