Very weird problem!!

[cjcj1949]

If the servos get driven to extremes there is no problem if they get there. If they can't get there then there is a problem as the servo will stall and the current will get very large and could damage the motor. Analogue servos didn't really have this problem, but digitals do and the higher the performance the worse they may be.

[Richardmid1]

I have never had the problem of the servos going to their extremes upon initialising.

[cjcj1949]

Have you checked what has failed on the servos?

[Richardmid1]

I haven't had the servos apart but the motor certainly seems to work fine its just whatever is controlling the motor has lost the plot!

[cjcj1949]

There is a wiring fault that could cause this. I've had it on the cheap Twister Storm servos. There is a wire that connects the metal case of the motor to the 0v of the control board. If this wire breaks the servo picks up lots of noise and becomes unreliable. If you take the servo apart this is easy to see and fix. You could also check that the motor case is connected to 0V.

[Richardmid1]

But it's happened 4 times now always to the same servo (location)! The first set was the standard align 410m's, then hitec hs65mg's, then 2 sets of these kst ds115mg servos!

[cjcj1949]

We need to find out what has failed in these servos. Is it mechanical or electrical. It may be a combination of things. Driving servos from a flybarless system makes them work harder as they have to do the flybar's work and they are driven at a higher frequency. The physical location may also have something to do with it. In any mechanical system some places will be worse than others for heat and vibration and also mechanical load. I expect you could swap the drive to the two servos from the BeastX over and see if the fault moves. If it does then it is the BeastX. The other possibility is to look at the output from the BeastX and see if you have a problem with a faulty driver.

[nitromad]

is the servo a tight fit on heli?? or is it loose ? ,IE:do u need to force into place?.when i had my first 450 the servo was i tight fit bit too tight and wrecked the same servo time after time untill lhs told me to open the hole up with file so servo fitted loose it was good a gold since then (till i dumb thumbed it). might be worth a look

[Richardmid1]

Once it's in its loose. I guess you're thinking vibration? I balanced the blades and the heli runs smooth with no visual vibration. I could mount the new servos on rubber to eliminate vibration. It can't be the frame contacting the metal case of the servo causing something weird because it happened to hs65mg's!

[nitromad]

no not vibs in my case fit was tight it twisted/warped the servo case abit causeing servo to work harder get hotter etc till it failed

[Richardmid1]

I'm going to give hh a ring tomorrow. It's such a shame because this setup flies amazingly well when it's working!

[Richardmid1]

Ok spoke to someone at HH and he said there is no way the Satellite Rx could cause something like this. He was pretty certain it had something to do with the load on that one servo and mentioned maybe a bad swash plate bearing that could be notchy when its at a certain angle and that one servo takes all the strain maybe. I suddenly remembered I had done a mod to the swash to take the play out of it involving some grub screws which placed light pressure on the outer race taking all the play out of the bearing! I have now taken these 3 grub screws out of the swash! Should I go all the way and buy a new swash? I wanted a DFC swash anyway!

[cjcj1949]

is the servo a tight fit on heli?? or is it loose ? ,IE:do u need to force into place?.when i had my first 450 the servo was i tight fit bit too tight and wrecked the same servo time after time untill lhs told me to open the hole up with file so servo fitted loose it was good a gold since then (till i dumb thumbed it). might be worth a look

I can hardly believe that. But I've seen plenty of fixes that I didn't believe. I'm using MKS DS450s at the moment and they're a lot smaller so don't touch the sides, but I'll be using a file next time or the Tarot frame that allows you to use larger servos.

[Bronek]

I suddenly remembered I had done a mod to the swash to take the play out of it involving some grub screws which placed light pressure on the outer race taking all the play out of the bearing! I have now taken these 3 grub screws out of the swash! Should I go all the way and buy a new swash? I wanted a DFC swash anyway!

Swash mod would definitely alter mechanical properties of the whole set and might indeed put undue stress on a servo; I would buy a new swashplate (and a servo too). Not DFC though - they are tight bastards to work with!

[Richardmid1]

Ive just ordered a DFC swash! What do you mean 'tight bastards to work with'?