The rule of “Thumb”:
A lighter burr can be loosely defined as a burr with a thin thickness at root (B1). As the amount of material holding the burr to the parent metal increases, a more aggressive deburring action is required to remove the burr. Using this definition it is possible to have burrs that are tall, yet are “lighter” by our definition because the thickness at the root is small. Burrs of this type are good candidates for the sPINner.
An example of short, yet heavy burrs are the ridges created from drilling. When a drill breaks through a part a ridge is pushed up around the hole on the side where the drill breaks through. While this ridge can be short in burr height (H0), the thickness at burr root is wide. Often this material is more a part of the parent metal than the burr. These burrs will not be good candidates for the sPINner as a very aggressive and abrasive action that has a high stock removal rate is required to remove these burrs.
Another factor to weigh in this process is the material itself. More brittle materials will tend to have the burr break away from the part (parent metal) making the sPINner a good option.
Softer or more malleable material will tend to have the burr roll and flatten. Softer materials need to have a thinner thickness at root to be good candidates for the sPINner.