RDS Artemis Isocan seed metering help needed

[ZXR17]

I have just taken delivery of a 4.8 Weaving Sabre Tine drill to replace a KV 4.8 Tine seeder.
The Weaving is fitted with an RDS Artemis metering system.
We calibrated the drill for 2.6 kg / ha of OSR several times and achieved a perfect to the gram calibration . The weighed out calibration perfectly matched the meters estimated calibration.
A 3 ha bag of seed was put in the drill but only drilled out at 2.5 ha.
I recalibrated , all was correct but the application was still along way out.
Any ideas on what could be wrong.

 

[Rihards]

Wrong speed signal

 

[ZXR17]

It has a satellite speed signal so ' should ' be correct.

 

[Horn&corn]

Satellite can still be out of calibration but can be checked against 100m run or against tractor Speedo if you’re sure that’s correct.
Could be drill width is wrong in settings or sensor cutting out and in too late and early.
Dodgy scales?
Soooooo many variables!

 

[ZXR17]

Drill width checked. Two different scales reading the same.
Will check the satellite .
Very frustrating !

 

[whiddy]

Think you might find the drill is not 4.8m more like 4.65!!

 

[General-Lee]

Satellite can still be out of calibration but can be checked against 100m run or against tractor Speedo if you’re sure that’s correct.

Had to do that when setting up our Fert spinner.

 

[Matt77]

Unlikely, but bag could have been wrong weight????

 

[Phil P]

Are you using the pre start function? It will start metering seed at a set speed every time the drill goes into work.
It’s surprising how much extra seed you can use if your doing a lot of short runs.

 

[Zebbedee]

I would not use a satellite as speed signal better with a signal from tractor 7 pin plug and go for the gearbox one much more accurate

 

[MJB]

I would not use a satellite as speed signal better with a signal from tractor 7 pin plug and go for the gearbox one much more accurate

That would depend on the quality of the signal from the tractor, gearbox will only give you theoretical speed without accounting for wheel slip or tyre pressure changes, radar speed would be better but still needs calibrating, GPS the most accurate but still needs calibrating.

 

[Zebbedee]

That would depend on the quality of the signal from the tractor, gearbox will only give you theoretical speed without accounting for wheel slip or tyre pressure changes, radar speed would be better but still needs calibrating, GPS the most accurate but still needs calibrating.

Yea I know what you are saying but depends on how good your gps signal is?? Taking it of the tractor in my experience is the most reliable no need to worry about going under trees etc if tractor moves the drill turns simples! We tried gps on fert spinner but field sizes did not match up spreading light in almost every field, so plugged into tractor gearbox signal and no more problem yes in theory wheel slippage etc but in practice it is negligable but only my experience

 

[MJB]

Yea I know what you are saying but depends on how good your gps signal is?? Taking it of the tractor in my experience is the most reliable no need to worry about going under trees etc if tractor moves the drill turns simples! We tried gps on fert spinner but field sizes did not match up spreading light in almost every field, so plugged into tractor gearbox signal and no more problem yes in theory wheel slippage etc but in practice it is negligable but only my experience

A fertiliser spreader will be operated with almost zero wheel slip and drill (or any ground engaging implement for that matter) will create wheel slip. If the drill has it's own GPS receiver it is likely that it is correct out of the box or maybe needs a small correctiong/calibration.

The problem is more.likely the difference between calibration speed and driving speed. The Artemis system usually defaults to calibrate the drill assuming a forward speed of 8kmh if you are drilling at 12kmh this is a big difference and could account for the rate difference the OP is seeing. Alternatively check the pathway into the venturi if that is even partially blocked it will cause a significant difference between calibration and actual rate.

 

[Badshot]

My gd has the upgraded artemis, I found it very accurate.
It's necessary to run the calibration several times just to be sure it's correct.
I was sceptical of GPS for speed, but it's been perfect so far.

 

[yellow belly]

check the rubber seal on the metering fluted roller
with rape if there is a poor seal it can suck seed threw

 

[ZXR17]

Thanks for your suggestions of things to check.
What fan speed are you running for osr @Badshot . Too high a fan speed is one thing suggested. I am running at about 3800 rpm.
I'm sure Weaving will be down to sort it out as it's done less than a days work so far.

 

[Badshot]

I'm. On similar fan speed as I can't get the spool lower

 

[scottishsnake]

It has a satellite speed signal so ' should ' be correct.

Have you looked at the speed signal your gps box is putting out? I had to calibrate my trimble box to my krm spreader, it needed x number of pulses per kmh, the trimble speed was always accurate given a good signal, it was just that that signal is transmitted in pulses per kmh, which can be changed on the trimble to suit what your slave system needs

 

[scottishsnake]

Have you looked at the speed signal your gps box is putting out? I had to calibrate my trimble box to my krm spreader, it needed x number of pulses per kmh, the trimble speed was always accurate given a good signal, it was just that that signal is transmitted in pulses per kmh, which can be changed on the trimble to suit what your slave system needs

I should say, check that the speed your gps says your doing agrees with the speed on your drill screen, assuming the drill takes its speed from gps. If they agree when your going along, speeds not the problem

 

[B'o'B]

We have the same to a certain extent with rape but not others crops. I’ve put it down to the effect of the drill bumping along when drilling versus nice and steady when calibrating.
I now calibrate then just put 1kg in drill that out and see what area you’ve covered.
Then taking the figure on the screen for your rate, in this case 2.6kg/Ha and divide that by the area 1kg should have done and then multiple that by the area actually drilled by the 1kg.

So in your case:

1Ha divide by 2.6Kg = 0.38 Ha should get drilled by the 1 kg in the hopper to start off with.

If you had started of with just 1 kg you would have actually drilled 0.32 Ha

Take the rate in your screen 2.6 divide by 0.38 then multiply by 0.32 which gives 2.19kg/Ha

Put 2.19 kg/ha in the screen and hey presto your drilling at 2.6kg/Ha.