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09-05-2009 05:14 PM  8 years agoPost 1
blighty

rrApprentice

uk

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hi all,

just fitted some 620's to my 600n and there doing something that i don't think is right.

when you go from bottom to top stick on the pitch the swash gets there very quickly, but the movement is jerky like the swash is sticking to the main shaft. the swash is free moving, there is no binding any where, it still does it when i just have the servo disks on and the servos or warm to the touch.

I'm running....

DSX 9
AR7000
align 2 in 1 reg
2s 2250mha

any ideas?

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09-05-2009 09:29 PM  8 years agoPost 2
Dr Lodge

rrElite Veteran

Guildford, Surrey - UK

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Blighty,

Firstly I'm amazed you're actually working on one of your helis

I don't know what causes this problem, but I noticed the same thing some years back with the Futaba 9250 digital servos on my TSK Acrostar. In flight it seemed fine, but on the workbench the servos appeared to be "notchy". I wonder if its due to the motor being so quick and powerful that this happens when there's no load. Try putting a load on and see if that makes any difference.

Vibe 90, Vibe 50, Vigor CS x2,
Dyna-x, Knight 503D, Logo 10,
TRex 500, Furion, Gaui EP200

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09-07-2009 09:40 AM  8 years agoPost 3
J2M

rrVeteran

UK

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Blighty,

It's your hands mate. They're worn out and jerky from excessive use, particularly the RH one

Some more helpful comments:
- Could it be a Tx pot problem? Have you checked the servo display on your Tx to check that the bars are moving smoothly?
- If the servos are brand new, try working them over their full movement for a couple of minutes and see if that helps. The servo pots occasionally need running in to remove the initial sheen/glaze on the resistance track
- move the servos by hand with the Rx power off and the linkages disconnected. They should move with the same amount of resistance/smoothness/sound over the full range but you might find there are tight or graunchy spots. If so, try running them in a bit (as above) or adding more servo grease
- try changing the power supply to the Rx
- have you got your Tx right next to your model? If so, move it 2 or 3 yards away and try again. Sometimes receivers can behave strangely when there is a lot of signal or a lot of multipath room reflections

Dr Lodge
Does a heli you've never flown and which doesn't even have gear in it really qualify for inclusion in your signature? You know which one I'm talking about

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09-07-2009 03:16 PM  8 years agoPost 4
DWS6

rrKey Veteran

Newark,DE

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I hate to say it but this is normal behavior for the 610/620's. they move very rough and are noisy on the bench but seem fine in the air. I have them in my 600 too.

Dave Williams
Team Align

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09-07-2009 10:35 PM  8 years agoPost 5
blighty

rrApprentice

uk

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Firstly I'm amazed you're actually working on one of your helis
i think I've given a certain some one time to catch up, so there all coming out
It's your hands mate. They're worn out and jerky from excessive use, particularly the RH one
i've moved on to the left one now, can't move the right one any more

DWS6

i took the 600n (with said servos)out on Sunday, they made a huge difference compared with the servos i was using before. over the few flights i had with it, i didn't notice any problems with them being jerky. so you could be right there

J2M

i'll give what you said a go and let you know.

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09-08-2009 02:19 AM  8 years agoPost 6
w12martin

rrVeteran

Shantou, Guangdong, China

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My 620 servos are a bit noisy but perfectly smooth and no jerk at all

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09-08-2009 02:25 AM  8 years agoPost 7
DWS6

rrKey Veteran

Newark,DE

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I am curious as to what radio equipment you are using?

Dave Williams
Team Align

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09-08-2009 02:28 AM  8 years agoPost 8
blighty

rrApprentice

uk

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if you mean me, I'm using a DSX9 with an AR7000.

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09-08-2009 02:32 AM  8 years agoPost 9
w12martin

rrVeteran

Shantou, Guangdong, China

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If you mean me, I'm using Futaba 12FG, R6008HS and A-123 battery

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