171
PLANTING
RATE CONTROL
Gear Ratio Drawing - For Multiple Drive Combinations
Seed Rate Drive Setting (Calculating a Gear Ration for Multiple Drive Combinations)
Carry the Decimal place to the nearest 0.001 for accurate results.
Seed Ratio Calculation Example Procedure
The example outlined below assumes a single planter drive motor. Step 5 notes that this process has
multiple steps for more than one Stepper Seed Motor Drives.
1. Beginning with the Seed Rate Motor, count the number of teeth on the drive sprocket. Then count the
number of teeth on the driven sprocket.
2. Divide the number of teeth on the driven sprocket by the number of teeth on the drive sprocket. This
is the ratio of the Seed Rate motor.
3. Repeat the process for each sprocket combination in the drive system back to the meter.
4. Take the ratio of the Seed Rate Motor and multiply it by the ratio of the other sprocket combinations.
5. Repeat this process for multiple hydraulic drives. Enter the gear ratio for each motor under the
appropriate tab.
Note: Enter the number into the other channels for additional motor drives if they have the same total gear
ratio.
29
X
28
=
812
= 2.3743
18 19 342
Driven/Drive 1 X Driven/Drive 2 = Gear Ratio
Planter Drive
Sprocket
X
Seed Meter Shaft
= Gear Ratio
Seed Rate Motor Planter Drive Shaft
Driven/Drive 1 X Driven/Drive 2
Planter Drive Shaft
Sprocket (Drive)
(19 Tooth Sprocket)
Planter Drive Shaft
Sprocket (Driven)
(29 Tooth Sprocket)
Planter Drive Shaft
Sprocket (Driven)
(28 Tooth Sprocket)
Drive
Ratio 1
Drive Ratio 2
Seed Rate Motor (Drive)
(18 Tooth Sprocket)
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