Tips for Oversea Customers

How to calculate Final Reduction Ratio (2019-12-17)

This tip is for GALM users which how to calculate final reduction ratio.


First, you need to calculate primary(Spur Gear, Pinion Gear) and secondary(Diff Pulley, Center Pulley) reduction ratio. For each calculation formula are show on below.


Primary Reduction Ratio

Spur Gear

= Primary Reduction Ratio

Pinion Gear


Secondary Reduction Ratio

Diff Pulley

= Secondary Reduction Ratio

Center Pulley


Let's calculate how is the standard GALM primary and secondary reduction ratio. Here is standard GALM each gear and pulley.


Spur Gear : 92T

Pinion Gear : 23T


Diff Pulley : 39T

Center Pulley : 12T


Primary Reduction Ratio


= 4.00



Secondary Reduction Ratio


= 3.25



Now, you can see each reduction ratio. Then, next is calculation for final reduction ratio.


Primary Reduction Ratio × Secondary Reduction Ratio = Final Reduction Ratio


then this is going to be,


4.00 × 3.25 = 13.00


So, the final reduction ratio is 13.00.


Also, here is calculation when using Gear Drive Set.


Secondary Reduction Ratio for Gear Drive

Diff Gear

= Secondary Reduction Ratio

Counter Gear


And here is standard gear drive set ratio (Diff Gear : 54T, Counter Gear 27T).



= 2.00



And the final reduction ratio is,


4.00 × 2.00 = 8.00


Calculation is pretty simple so please make use of your machine setting.

Copyright 2015 Weld Technique Factory Co. All Right Reserved.