Reading a finger meter chart – Great Plains YP1630F-1670 Material Rate User Manual
Page 5
Great Plains Manufacturing, Inc.
Seed Rate
3
2012-12-04
401-832B
Reading a Finger Meter Chart
Note: Actual charts begin on page 8.
Images at right are excerpts.
Seed Rate: Population
1.
Find the chart (Low or High range) which covers your
population.
2.
Find the desired seed population or seed spacing.
Seed Rate: Meter rpms
3.
Note the range of meter rpms suitable for that
population.
Inconsistent Population Risk:
The shaded rpms are the recommended rpms for most
consistent results. Use the recommended driving speed if
possible. The unshaded rpms are acceptable. Blank cells are
outside the range of reliable meter operation.
Seed Rate: Sprocket Combinations
4.
Configure the Range and Transmission sprockets.
The numbers in the Driving/Driven columns are the
number of teeth (T) stamped on the sprockets
required.
Seed Rate: Planting Ground Speed
5.
Observe the recommended planting speed. Speed
directly controls meter rpm.
Range
Driving =30
prockets
Driven =20
nsmission
Seed
Seed
11.3 kph
10.5 kph
9.
mbinations
Population
Spacing
Meter
Meter
M
g
Driven
(seeds/ha)
(cm)
(rpm)
(rpm)
(
28
55 735
25.6
61
57
27
57 799
24.7
63
59
26
60 022
23.8
66
61
=20
Ground Speed
Seed
11.3 kph
10.5 kph
9.7 kph
8.9 kph
8 kph
Spacing
Meter
Meter
Meter
Meter
Meter
(cm)
(rpm)
(rpm)
(rpm)
(rpm)
(rpm)
25.6
61
57
52
48
24.7
63
59
54
50
45
23.8
66
61
56
52
47
22.9
68
63
58
54
49
22.9
68
63
59
54
49
For Round Corn optimum meter speed is 45 to 75 RPM
( Shaded & Non-shaded areas )
Range
Driving =30
Sprockets
Driven =20
Transmission
Seed
Seed
11.3 kph
10
Combinations
Population
Spacing
Meter
M
Driving
Driven
(seeds/ha)
(cm)
(rpm)
(
17
28
55 735
25.6
61
17
27
57 799
24 7
63
g 30
n =20
Ground Speed
Seed
11.3 kph
10.5 kph
9.7 kph
8.9 kph
8 kph
n
Spacing
Meter
Meter
Meter
Meter
Meter
(cm)
(rpm)
(rpm)
(rpm)
(rpm)
(rpm)
25.6
61
57
52
48
24.7
63
59
54
50
45
23.8
66
61
56
52
47
22.9
68
63
58
54
49