Why doesn't my gimbal work?

[Gunter]

I have been trying to get this new gimbal working but with no luck! I have it hooked up to the WKM tilt and roll. When the heli tilts, the gimbal tilts, but totally randomly. I set the zero point, tilt the heli and then put it back on the table but the gimbal returns to a different position. No matter how much I tweak the gains, start and end points, it always does its own thing!

Is it because of the type of servos? (continuous) or maybe because of the potentiometer thingies?? Does the WKM not speak fancy gimbal language?

Thanks, Gunter.

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[ZAxis]

The first thing I would do is to take the WKM out of the loop and test the servos independently using a servo programmer. If you get full control that way, the fault must be at the WKM end or the cables.

Hope this helps
andy

 

[DennyR]

DJI works on the proportional system as opposed to the slew mode. It looks like the way you have it set-up you are using proportional which is correct so I think the problem is with the pots. They could be slipping on the drive or they are damaged by over rotation. Looks like a nice camera mount but quite a slow gear ratio. You may see better response from faster servos.

 

[Gunter]

Thanks guys, I will try again a bit later.


Regards,

Gunter.
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[Gunter]

DJI works on the proportional system as opposed to the slew mode. It looks like the way you have it set-up you are using proportional which is correct so I think the problem is with the pots. They could be slipping on the drive or they are damaged by over rotation. Looks like a nice camera mount but quite a slow gear ratio. You may see better response from faster servos.

Denny, spot on mate, I'm impressed

Last night when testing it for the first time, I didn't spot that the pots grub screw wasn't done up tight. The pot was staying still while the gimbal was rotating...it shows what happens after consuming too much red wine

I sorted it out this evening in about 15 minutes, but as you said, it reacts very slowly. If I change those huge cogs/sprockets (whatever they are called) for smaller ones, do you think it would make it react a bit quicker? Video below:

Cheers,

Gunter.

 

[rwilabee]

What brand of Gimble is that. Looks pretty nice.

Rich

 

[Gunter]

What brand of Gimble is that. Looks pretty nice.

Rich

Not sure Rich, but I am willing to swap it for an AV130, because it's too big for my setup!

My partner in crime bought it second hand from a friend, it's hardly been used, so I'm not sure who made it...I'll find out.

Gunter.

 

[rwilabee]

Yes it would probably be to big for me also. I'm just running a quad.

Rich

 

[DennyR]

Gunter you need to be as close to direct drive as you can get. Having said that you will see some notches when in direct drive even with 4900 possible positions over 120 degrees. Say a Hitec HS-M7990TH mag. encoder servo. I would suggest 2:1 drive ratio. Expensive but good and programmable. You can extend the travl to 180 degrees which would then give you 90 degrees of tilt axis.
That is going to be about as good as you can get with the standard DJI outputs.
D.

 

[Gunter]

Thanks Denny, I will see if I can get some smaller pulleys.


Regards,

Gunter.
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[DennyR]

Try Servo City they have a lot of that kind of stuff.

regards
D.