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
Secondary Reduction Ratio
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).
And the final reduction ratio is,
4.00 × 2.00 = 8.00
Calculation is pretty simple so please make use of your machine setting.
