The "Tips & Techniques" section offers helpful hints on the use and maintenance of your Barber-Colman gear cutting and hob sharpening machines. We have a wealth of information available on this kind of equipment and we think that this would be the ideal forum to share some of it with you. We update these monthly, so be sure to bookmark this page and check back often.

In this month's tip we give you some common formulas that are used for figuring setups of change gears on the machines.

Pitch Diameter   =   Number of Gear Teeth/Normal Diametral Pitch

Outside Diameter   =   Pitch Diameter + 2 X Addendum

Base Diameter   =   Pitch Diameter X Cosine of the Pressure Angle

Diametral Pitch   =   Number of Gear Teeth/Pitch Diameter

Circular Pitch   =   Pitch Diameter X Pi/Number of Gear Teeth

Pitch Diameter   =   Number of Gear Teeth/Normal Diametral Pitch X Cosine of the Helix Angle

Outside Diameter   =   Pitch Diameter + 2 X Addendum

Base Diameter   =   Pitch Diameter X Cosine of the Transverse Pressure Angle

Tangent of Transverse Pressure Angle   =   Tangent of Normal Pressure Angle/Cosine of the Helix Angle

Normal Diametral Pitch   =   Number of Gear Teeth/Pitch Diameter X Cosine of the Helix Angle

Normal Circular Pitch   =   PI/Normal Diametral Pitch

Transverse Circular Pitch   =   Normal Circular Pitch/Cosine of the Helix Angle

Axial Pitch   =   Lead/Gear Teeth

Axial Pitch   =   Normal Circular Pitch/Sine of Helix Angle

Module   =   25.4/Normal Diametral Pitch

We hope these help. Next month we will add to this list.