By inputting some basic variables, our calculator can help you on your path to determine the most suitable gear tooth combinations to meet your custom gear requirements.

How to use:

• Ratio: Enter your desired gear ratio. A list of suitable ratios within 0.5 of your desired ratio will be displayed
• CD: Enter the Centre Distance between the Drive and Driven gears. A list of suitable ratios within 0.1mm of your desired CD will be displayed
• Face Width (The Axial length of your gear): Enter your desired Face Width. Generally speaking, the larger the face width, the stronger the teeth will be
• Pressure Angle: Choose your desired Pressure Angle. Common angles for modern gear boxes are 20° and 25°. Generally speaking, the larger the pressure angle, the stronger the teeth will be
• Material: Choose your gear material. Our options include SAE 8620, SAE 4320 and SNCM 6X
• T2/T1: This shows the tooth count for the Driven Gear (T2) and Drive Gear (T1). In order to reduce the undercut of the gear teeth, T1 has a 10-tooth minimum, but will require a shift coefficient during manufacturing to eliminate completely. Typically, a minimum of 14-teeth are required to avoid undercut without having to change the shift coefficient
• M: This shows the gear tooth Modulus. Generally speaking, the larger the Modulus, the stronger the teeth will be
• OD2/OD1: This shows the Outer Diameter for the Driven Gear (OD2) and Drive Gear (OD1)
• β: This shows the Helix Angle of the gears. Straight-Cut gears are 0°
• TWidth2/TWidth1: This shows the Tooth Width for the Driven Gear (TWidth2) and Drive Gear (TWidth1)
• Tip2/Tip1: This shows the Tooth Tip Width for the Driven Gear (Tip2) and Drive Gear (Tip1)
• Contact Ratio: This shows the Contact Ratio for the mating gear teeth (the number of teeth in contact at the same time). This should always be greater than 1.2 to reduce stress on individual teeth
• Strength: This shows the load-bearing capacity of the gear teeth. Please note that this is an estimate based on various complex calculations
• Results: After entering the required variables, the calculator will display a list of suitable tooth combinations based on the variables entered

As always, if you have any questions at all, please feel free to Contact Us.