Great Plains 606NT Material Rate - Manual (Page 28)

26 3P605NT, 3P606NT, 605NT & 606NT Table of Contents Main Box Rates Great Plains Manufacturing, Inc.
151-122B Table of Contents Main Box Rates 2011-10-21
Native Grass Calibration Formulas and Example
For a metric example, see page 43.
Formulas Example
Know your Desired seed rate in pounds per acre:
TargetRate Example target seed rate:
55 pounds per acre
Choose the number of rows to sample. Example:
3
Weigh the empty sample container(s):
ContainerWeight Example container are three 1.5 pound buckets:
4.5 pounds
For a larger sample, we set the Drive Type high. Suggested calibration Drive Type:
4
As there is only minor benefit in changing the final drive
sprocket for calibration, we leave it as is. Example final drive sprocket:
18T
Examine the transmission for Standard vs. Seed Rate
Reduction/ Example transmission: Rate Reduction not installed:
Standard
Operate crank/gauge wheel for one tenth acre:
CalibrationRevs For this example, a model 606NT:
99.5 revolutions (
1 ⁄
10
th
of 995)
Weigh the collected seed plus container(s):
GrossWeight Example:
GrossWeight = 8.25
Obtain the net sample weight: Example:
8.25 - 4.5, or:
NetSample = 3.75
Determine the net sample weight per cup: Example:
3.75
÷ 3, or:
NetPerCup = 1.25
Scale the sample to drill-wide: Example:
1.25 x 9, or:
NetFullWidth = 11.25 pounds
Scale the sample to a full acre: Example:
11.25 x 10, or:
NetPerAcre = 112.5
Look up the number of meter shaft revolutions per acre:
CalCharRevs
for the current Drive Type, final sprocket and
transmission configuration. Example:
DT4, 18T and Standard is:
536.7 revolutions per acre.
CalChartRevs = 536.7
Determine the cup rate for this seed mix: Example:
112.5
÷ 536.7, or:
WeightPerRev = 0.210
Determine the number of revolutions required for the
target field rate weight metered per shaft revolution: Example:
55
÷ 0.210, or:
TargetRevs = 262
Look up the Drive Type and final sprocket for
TargetRevs Example:
Drive Type: 2
Final Sprocket: 15 T
NetSample GrossWeight ContainerWeight – =
NetPerCup
NetSample
SampledRows
--------------------------------------- =
NetFullWidth NetPerCup 9 × =
NetPerAcre NetFullWidth 10
×
=
WeightPerRev
NetPerAcre
CalChartRevs
-------------------------------------- =
T etRevs arg
TargetRate
WeightPerRev
------------------------------------------ =