Gear Ratio Drawing - For Multiple Drive Combinations
Seed Rate Drive Setting
Planter Drive Shaft
Sprocket (Drive)
(19 Tooth Sprocket)
Seed Rate Motor (Drive)
(18 Tooth Sprocket)
29
18
Driven/Drive 1
Planter Drive
Sprocket
Seed Rate Motor
Driven/Drive 1
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.
Ag Leader PN 4002083 Rev. N
(Calculating a Gear Ration for Multiple Drive Combinations)
Drive
Ratio 1
Planter Drive Shaft
Sprocket (Driven)
(29 Tooth Sprocket)
28
X
19
X
Driven/Drive 2
Seed Meter Shaft
X
Planter Drive Shaft
X
Driven/Drive 2
Planter Drive Shaft
Sprocket (Driven)
(28 Tooth Sprocket)
Drive Ratio 2
812
=
342
= Gear Ratio
= Gear Ratio
P
LANTING
= 2.3743
177
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