Precision air cart metering discrepancy - The Combine Forum
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post #1 of 25 (permalink) Old 05-06-2019, 12:28 AM Thread Starter
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Precision air cart metering discrepancy

When calibrating my air cart, 2280 tow between mechanical drive, the displayed rate is never correct. Always shows lower than whats being applied. Hectares are correct, ground speed correct, machine width correct, sprocket teeth numbers are correct, sample weighed with a digital scale.

Cailbration proceedure...
Drive around so product settles
Set slides at 35
Prime meters
Go to cal in display
Set desired rate
Zero meter cal #
Turn on tanks
Push go
Crank meter
Weigh products
Enter product mass
Set slides accordingly
Go to field
Start seeding and see rate is 15ish kg/ha low
Keep seeding and see tank seems to be emptying quicker than i think. Say f it its gotta be close and empty tank only to see its over aplying.


Any suggestions as to why that would be. Its getting old setting rates based off acres per fill.

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post #2 of 25 (permalink) Old 05-06-2019, 12:44 AM
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Why not run the weights after you adjust the slides?

If it’s consistent you might just have to run a correction factor.

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post #3 of 25 (permalink) Old 05-06-2019, 01:20 AM Thread Starter
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Originally Posted by joesixpack View Post
Why not run the weights after you adjust the slides?

If it’s consistent you might just have to run a correction factor.
I guess i can try count how many cranks per hectare while the carts seeding and then calculate based off that.

Its supposed to be that you do the meter calibration, set the slide and go to the field and set your rate off what the display is showing

Last edited by stsdavew; 05-06-2019 at 01:53 AM.
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post #4 of 25 (permalink) Old 05-06-2019, 08:09 AM
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Did you account for the wight of the bag. Or that dose not matter for your cal? And do you know for sure you have the bushels in the tank by wight. We wight the product that go’s in the tank to Make sheer it’s metering right. We found you will always have less in the tank versus it will hold.
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post #5 of 25 (permalink) Old 05-06-2019, 09:00 AM
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Since it is consistently applying heavy based on a small sample you could try this. Suppose it applies 9% too heavy as a rule, when you weigh your calibration sample, just multiply that sample weight by 109%, or 1.09. As an example 30 Lbs of sample would be considered as 32.7 Lbs when selecting your sprockets or entering it into your computer on many machines.

This will make the meter setting 9% slower. Many early air seeder designs have an engineered flaw in the calculation mathematics because they never ever wanted anyone to have to sow a small field twice because of an excessively light seed application, particularly on small seed rollers.

Last edited by Haystack; 05-06-2019 at 09:06 AM.
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post #6 of 25 (permalink) Old 05-06-2019, 09:35 AM
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Have you got the right sprocket combination for your drill width on your cart?
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post #7 of 25 (permalink) Old 05-06-2019, 10:21 AM Thread Starter
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Originally Posted by Slip clutch View Post
Did you account for the wight of the bag. Or that dose not matter for your cal? And do you know for sure you have the bushels in the tank by wight. We wight the product that go’s in the tank to Make sheer it’s metering right. We found you will always have less in the tank versus it will hold.
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Have you got the right sprocket combination for your drill width on your cart?
Yes bag weight is accounted for. No i dont weigh into the cart so i dont know exactly whats going in. According to the book the sprocket combination is correct... acres and speed are correct.
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post #8 of 25 (permalink) Old 05-06-2019, 10:27 AM Thread Starter
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Precision air cart metering discrepancy

Quote:
Originally Posted by Haystack View Post
Since it is consistently applying heavy based on a small sample you could try this. Suppose it applies 9% too heavy as a rule, when you weigh your calibration sample, just multiply that sample weight by 109%, or 1.09. As an example 30 Lbs of sample would be considered as 32.7 Lbs when selecting your sprockets or entering it into your computer on many machines.

This will make the meter setting 9% slower. Many early air seeder designs have an engineered flaw in the calculation mathematics because they never ever wanted anyone to have to sow a small field twice because of an excessively light seed application, particularly on small seed rollers.
But i wont know how much its off till i run out of seed and i would have to not change the rate till that happens to know what % its off. Im loading seed straight out of the bin so not real easy to weigh it. its a 2009 cart so would that be considered early design? I would like to figure out whats wrong and correct it not just work around it.
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post #9 of 25 (permalink) Old 05-06-2019, 11:59 AM
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Have you seeded 10-15 acres then re-calibrated?

For us it doesn’t seem to matter how you fill the meter it isn’t the same as seeding for a bit. Calibration is always off a bit and after redoing a known weighed amount works out real close.

If you don’t know how much you have in the tank it’s impossible to know if your applying the correct amount.
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post #10 of 25 (permalink) Old 05-06-2019, 12:01 PM
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Another thing is to check if your leaking air at the lids. That will throw your rate out big time.

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