Hobs & Form Relived Cutters: Common Sharpening Problems
The article "Hobs & Form Relived Cutters: Common Sharpening Problems" appeared in the May/June 1998 issue of Gear Technology.
Fig. 1 shows the effects of positive and negative rake on finished gear teeth. Incorrect positive rake (A) increase the depth and decreases the pressure angle on the hob tooth. The resulting gear tooth is thick at the top and thin at the bottom. Incorrect negative rake (B) decreases the depth and increases the pressure angle. This results in a cutting drag and makes the gear tooth thin at the top and thick at the bottom.
The article "Hobs & Form Relived Cutters: Common Sharpening Problems" should appear in the box below, but if you do not see it, you can download it here.