Rtk gps

[JJfarmer]

Hello , wondering if anyone has same problem and hopefully a solution , using rtk base station gps on new Holland t7230 with 4m lemken solitair 9 drill , the problem I want to get rid of is .. turning into a new row on a Sidlands (slope) I'm getting left with a missed strip which can go on for 20 yards at times the strip is usually only about 20cm wide but still very annoying (drill men will understand) . I've tried adjusting the swath acquisition and aggressiveness to no effect! Anyone in same boat or have a solution? Thanks

 

[wanton dwarf]

MIGHT be a tractor/implement alignment problem if the Drill centralises after 20 yards or so and is still on the same slope.

If so exaggerate the turn - over steer - into the run before turning on auto steering - get the drill aligned before the tractor as you would do a trailer - even if it's 3 point linkage mounted drop drill slightly above the line of attack you want.

If 3 point linkage check the sideways movement.

Otherwise it might be a problem to do with the angle of the tractor compared with the height of the receiver.

Need to see if the settings for receiver height on tractor are set and the receiver can sense tractor angle .. does the receiver calculate the misplacement for tractor central position correctly ? However in this case it would always be mis-aligned on a slope.

BTW I'm no GPS expert.

Only other way of doing it would be to shunt the GPS at the start of the run .. not a glorious solution though.

 

[Robert K]

We had a similar problem running a 4m powerharrow and it turned out the GPS needed recalibrating

 

[Pheasant Surprise]

Hello , wondering if anyone has same problem and hopefully a solution , using rtk base station gps on new Holland t7230 with 4m lemken solitair 9 drill , the problem I want to get rid of is .. turning into a new row on a Sidlands (slope) I'm getting left with a missed strip which can go on for 20 yards at times the strip is usually only about 20cm wide but still very annoying (drill men will understand) . I've tried adjusting the swath acquisition and aggressiveness to no effect! Anyone in same boat or have a solution? Thanks

First thing to do is a proper pass to pass calibration and check of the tractor guidance/steering only - do you know the process to do this? I can post up a brief summary if you need it.

The next thing to do is to recheck you have entered all your implement measurements and offsets correctly into the guidance.

 

[JJfarmer]

MIGHT be a tractor/implement alignment problem if the Drill centralises after 20 yards or so and is still on the same slope.

If so exaggerate the turn - over steer - into the run before turning on auto steering - get the drill aligned before the tractor as you would do a trailer - even if it's 3 point linkage mounted drop drill slightly above the line of attack you want.

If 3 point linkage check the sideways movement.

Otherwise it might be a problem to do with the angle of the tractor compared with the height of the receiver.

Need to see if the settings for receiver height on tractor are set and the receiver can sense tractor angle .. does the receiver calculate the misplacement for tractor central position correctly ? However in this case it would always be mis-aligned on a slope.

BTW I'm no GPS expert.

Only other way of doing it would be to shunt the GPS at the start of the run .. not a glorious solution though.

Th

MIGHT be a tractor/implement alignment problem if the Drill centralises after 20 yards or so and is still on the same slope.

If so exaggerate the turn - over steer - into the run before turning on auto steering - get the drill aligned before the tractor as you would do a trailer - even if it's 3 point linkage mounted drop drill slightly above the line of attack you want.

If 3 point linkage check the sideways movement.

Otherwise it might be a problem to do with the angle of the tractor compared with the height of the receiver.

Need to see if the settings for receiver height on tractor are set and the receiver can sense tractor angle .. does the receiver calculate the misplacement for tractor central position correctly ? However in this case it would always be mis-aligned on a slope.

BTW I'm no GPS expert.

Only other way of doing it would be to shunt the GPS at the start of the run .. not a glorious solution though.

Thanks for reply , linkage is solid and measured to bang on centre , tractor lines up perfect when doing the calibration test , have tried coming into row from both sides with same result , even reversing back to fence when gps engaged and still ends up the same also it is usually fine when coming onto a slope mid run it's just the bloody start off

 

[JJfarmer]

First thing to do is a proper pass to pass calibration and check of the tractor guidance/steering only - do you know the process to do this? I can post up a brief summary if you need it.

The next thing to do is to recheck you have entered all your implement measurements and offsets correctly into the guidance.

Hello , not sure what a pass to pass calibration is ? The implement settings are fine as when on flat and out with tape measure it's good

 

[Brisel]

Drill a wider headland so it has more time to acquire the right line? If it takes 20 yards, why not drill an extra 5-5 times around?

Sorry, I can't find a decent image from a Trimble, so I found one for Greenstar instead

Increase your equivalent of measurement D in the photo above & see if that makes a difference. I know this is for a trailed implement but you get the idea.

 

[JJfarmer]

Drill a wider headland so it has more time to acquire the right line? If it takes 20 yards, why not drill an extra 5-5 times around?

Sorry, I can't find a decent image from a Trimble, so I found one for Greenstar instead
View attachment 828801
Increase your equivalent of measurement D in the photo above & see if that makes a difference. I know this is for a trailed implement but you get the idea.

Hi , can you explain D a little more, is it length of drill front to back ? Ta

 

[Matt L]

Yes. From the centre of the linkage balls to the last coulters on the drill

 

[Brisel]

Hi , can you explain D a little more, is it length of drill front to back ? Ta

More the distance between the hitch and the back of the drill - my example was for a trailed - is yours mounted? By extending that distance your tractor would turn wider to get onto the line. Try it & if it makes no difference, put it back & try something else.

Since you've said it's ok with plenty of time to get straight when in the middle of the field, is there anything else that might impede the ability to steer like a fixed front press you're dropping first or lack of weight on the front axle?

 

[JJfarmer]

More the distance between the hitch and the back of the drill - my example was for a trailed - is yours mounted? By extending that distance your tractor would turn wider to get onto the line. Try it & if it makes no difference, put it back & try something else.

Since you've said it's ok with plenty of time to get straight when in the middle of the field, is there anything else that might impede the ability to steer like a fixed front press you're dropping first or lack of weight on the front axle?

Yes mounted ,, I have a front press but dont drop it till well down the row, it's more of a front weight ?

 

[Pheasant Surprise]

Hello , not sure what a pass to pass calibration is ? The implement settings are fine as when on flat and out with tape measure it's good

So without any implement on the back, does the tractor steer down the AB line perfectly without any deviation, if you run down the same AB several times (measure the deviation each time you drive down the AB, going in the same direction)?

Have you checked it steers exactly on the line (repeat drive down the same AB) when on a slope?

 

[Norfolk Olly]

Sounds like it needs a roll calibration, or try adjusting the roll cal figure