Overlap on rtk one side

[ted1060]

Hi , I am having my fm750 and ez pilot on rtk overlap when the drilled work is on the r/h side . When going the other way I am bang on perfect. I’ve drilled the wheat now ( tht was a challenge this year ) and you can see a little over lap the drill is attached bang on centre of tractor. Can I solve this by a recalibration. I have tried this. I do notice that during the day I drop to only 6 satellites and later on I have 9 does this have any affect ? Many thanks in advance

 

[Badshot]

Potentially it will either have an offset entered into it or the position of the antennae possibly wrong.
Or there is part of the calibration where you turn round and park facing the other way in exactly the same spot, that could have been done wrong.

But first I'd make sure it's pulled straight, it might pull slightly offset, which is where putting an offset in for drilling comes in.

 

[ted1060]

No offset entered , antenna is exactly down the centre of tractor. The tractor is off the marker line so drill is pulling square. I’ll have ago at recalibrate. What’s the best way to achieve best accuracies. I spray paint on wheel marks on concrete

 

[benny6910]

If it’s bang on perfect one way and not the other I would say you’ll need to put a offset in. I’m only on sf1 but I need to have a 2cm offset in my 3m combi

 

[del_boy]

What kind of drill, mounted or trailed? I run a 6m trailed pottinger on sf2 and requires a 4cm offset

 

[clbarclay]

If you two passes next to each other in the same direction, is the overlap right?

 

[Banana Bar]

Popcorn in.

 

[Chae1]

Our linkage mounted Amazone drill doesn't pull straight, despite all stabilisers etc set the same.

Just put a marker inline with outside coulter, turn and measure again coming other way. Do 4 passes, mines got little rat runs every 3rd pass because i didn't.

 

[DrWazzock]

I honestly have a gut feeling it's a more fundamental problem with GPS and RTK system/software IMO. I have had it so many times. Nothing to do with drilling rig pulling to one side but they tell you it is and to put the offset in to bodge it. Even had the problem with a fully mounted brush seedbox which can't pull to one side. I have set physical markers equal on similar rigs and matched up perfectly on flat land, yet the GPS guides you wide and narrow or was it just wrong one way. Can't remember, chucked to whole thing to the back of the workshop and haven't missed it a bit.

 

[Adeptandy]

I have the same issue, spot on left hand side of the drill on return pass and approx a coulter wide ( 125mm ) in return pass with the right side of the drill.
At least I can do a test on 250mm spacing this year now ?

 

[DrWazzock]

Yes it matched fine going one way but not the other. You could see it was visibly wrong looking at the bout marker and front wheel. I reset the AB line, repositioned the antenna a few times thinking it was off centre but same old mismatch going one way.

If it had been an offset problem then surely it would go narrow one way and wide the other, not spot on one way and wide the other, that's provided the drill width has been programmed correctly and it is what you think it is?!

 

[del_boy]

Yes it matched fine going one way but not the other. You could see it was visibly wrong looking at the bout marker and front wheel. I reset the AB line, repositioned the antenna a few times thinking it was off centre but same old mismatch going one way.

If it had been an offset problem then surely it would go narrow one way and wide the other, not spot on one way and wide the other, that's provided the drill width has been programmed correctly and it is what you think it is?!

Double check your drilling width. Our 3m amazone is only 2.83m coulter to coulter. Set it up 2.9m on gps and matches up fine but impossible to get a 24m tramline, luckily we have auto nozzle shutoff.
Auto steer is amazing when you have it but youve got to want to get it right and when you finally do the results are brilliant once its set up right.

 

[bitwrx]

Yes it matched fine going one way but not the other. You could see it was visibly wrong looking at the bout marker and front wheel. I reset the AB line, repositioned the antenna a few times thinking it was off centre but same old mismatch going one way.

If it had been an offset problem then surely it would go narrow one way and wide the other, not spot on one way and wide the other, that's provided the drill width has been programmed correctly and it is what you think it is?!

There may be something wrong, but I think you've stumbled on the solution I'd use; fudge around with the offset and implement width until you get the best mix of even bout width, overlap/miss and accurate tramline spacing.

 

[Robt]

First and easy thing to check. Drive up and down the same ab line and the tractor should drive up and down on exactly the same tyre marks. If it doesn’t then you start with tractor geometry . If it does then you start a new thread about drill offset. You then ignore 99% of the advice and take the only bit of advice. Use a tape measure!

 

[ted1060]

I have a 3 m amazone 3 point linkage powerharrow drill which I run on gps at 2.9 metres. How do I put an offset in for when drilled work is on my right and I’m running inside the mark ( overlapping) will tht affect the line once I’ve turned round and coming back ? What software version should I be running too ? Want to get it sorted before doing root crop beds

 

[fred.950]

First and easy thing to check. Drive up and down the same ab line and the tractor should drive up and down on exactly the same tyre marks. If it doesn’t then you start with tractor geometry . If it does then you start a new thread about drill offset. You then ignore 99% of the advice and take the only bit of advice. Use a tape measure!

Read the above!! It’s the only way

 

[Slick]

Read the above!! It’s the only way

What he said

 

[Badshot]

Double check your drilling width. Our 3m amazone is only 2.83m coulter to coulter. Set it up 2.9m on gps and matches up fine but impossible to get a 24m tramline, luckily we have auto nozzle shutoff.
Auto steer is amazing when you have it but youve got to want to get it right and when you finally do the results are brilliant once its set up right.

20 coulters?

 

[Agriimark]

You need to do what @Robt said. I would not just 'bodge' it and hope. Do you leave the receiver on the tractor all the time or take it off. If the later id re calibrate on a machine it is on even if it has been on previous. Calibrate on a hard, flat, level surface. Offset can be caused by not doing this. Mounting angle in relation to the machine angle can cause it, tyre pressure's. Also i would not use spray paint. I use bricks, drive forward, turn around and come down the same pass. And like said use a tape. I would look at this before the implement.

 

[KB6930]

If you're bang on 1 side and overlapping the other if you put an offset in it'll just swap the problem from side to side you'll need to make the drill a little wider then put an offset in to sort your issue.
Definitely start with check the tractor is tracking in exactly the same tyre marks after turning round which isn't easily done on concrete I like to do it in a field so you can measure how far off you are .
Then if the tractor is running fine you'll need to start fine tuning offsets etc for the drill .