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All Forums >> Radios, Batteries, Clubhouse and more >> RC Radios, Transmitters, Receivers, Servos, gyros >> Radio Manufacturer Direct Support >> Hitec/MultiPlex Radios- Ask Hitec Customer Service >> 605 Centering issue
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605 Centering issue - 5/27/2002 8:59:24 AM   
14th_Reaper



Posts: 374
Joined: 2/19/2002
From: Tulsa, OK, USA
Status: offline 		Hi Mike,

I have (7) 605BB servos in my DP Ultimate. The servo on my rudder and throttle give me no problems at all that I am aware of.

The remaining 5 servos are giving me trouble on centering the elevator and the ailerons. On 5 servos there is quite a noticeable gap (3/16ths) instead of being centered. These servos are 1 - 2 months old and have only seen 5 flights max. I am running these servos with 12" extensions on the ailerons and into their own channel on the receiver.

Do you have any suggestions to possibly help me solve this problem?

Thanks for taking the time to read my problem.
       Post #: 1

605 Centering issue - 5/27/2002 4:05:52 PM   
Dazzler



Posts: 1471
Joined: 1/5/2002
From: Bedford Heights, OH, USA
Status: offline 		14th_Reaper, what kind of servo horns are you using, are they the stock ones that comes with the servo's or are they the aftermarket extended kind. Daz...


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Freya
YS80

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605 Centering issue - 5/27/2002 7:14:32 PM   
14th_Reaper



Posts: 374
Joined: 2/19/2002
From: Tulsa, OK, USA
Status: offline 		Daz,

They are the big red ones that came in the package that I got with the servos. Also, there isn't any real slop in the linkage or in the mounting. I used the grommets and they are nice and firmly attached.

If you bump the stick in the opposite direction of the turn you just completed they will center themselves. It does this in both directions. It's almost like you have to continually fly the plane.

(in reply to 14th_Reaper)
       Post #: 3

605 Centering issue - 5/28/2002 1:15:35 AM   
Dazzler



Posts: 1471
Joined: 1/5/2002
From: Bedford Heights, OH, USA
Status: offline 		14th_Reaper, I had the same problems when I tried outfitting my plane with the large Servo horns. Here's the deal I've found out with my experience with my 605's.

: With std. 605 Servo's or any other non digital servo, you have a centering issue, but when used with the std size servo horns, they center very well. No non digital centers perfectly, and by putting a longer servo horn on the servo, you are exagerating that non centering effect. The futher you go away from that servo, the worse its gonna get.

My suggestion, try your std length servo horns with your plane, and see the difference. BTW, those red ones are too long, even though they are std with the servo. Just my thoughts, and my plane does not require any constant trimming.


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Freya
YS80

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605 Centering issue - 6/17/2002 6:57:47 AM   
Rcpilot


 

Posts: 6412
Joined: 3/20/2002
From: Arvada, CO, USA
Status: offline 		I'm having the same problem with some HS-605BB servos. I've got five (5) of them on a Sig 231EX and the aileron servos don't center properly.

If I give it right stick input, the left aileron goes down and then returns to a position that it almost 1/2" high. Same thing happens with opposite stick input and the other aileron.

I reset the transmitter to ZERO. I'm using a JR652 TX. I reset all the data to zero and then took the servos apart. I adjusted the potentiometers on both servos, with barely a noticable difference.

I guess I'll have to ship them back to Hitec unless someone knows how to fix the problem.

_____________________________

Airplanes have expiration dates. It''s just not printed anywhere on them.
I''m not really an airplane pilot; but I did stay at a Holiday Inn Express last night.

(in reply to 14th_Reaper)
       Post #: 5

605 Centering issue - 6/17/2002 8:30:03 AM   
14th_Reaper



Posts: 374
Joined: 2/19/2002
From: Tulsa, OK, USA
Status: offline 		Well, I have had all 7 of mine back in the LHS since the date of the first post. According to the LHS owner operator they are definately not centering and he has been waiting on a call tag from Hitec since about the same time. I hope the lack of a reply from Mike is not an indication of the typical service one normally gets from Hitec.

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       Post #: 6

605 Centering issue - 6/17/2002 11:19:12 PM   
MikeMayberry



Posts: 2823
Joined: 1/15/2002
From: Poway, CA, USA
Status: offline 		Centering issues have alot to do with the linkage and the way they are mounted. If the linkage is attached to the to the outide hole on the horn any centering issues will be exagerated. If you are using sulivan style ny-rods the control surfaces will act as described. The only way to truely see if the servo is not centering properly is at the horn. It is true that a 3 pole motor analog servo will not center as well and a 5 pole, coreless of digital servo.

If the dealer has not received a call tag by now then I would have him contact us again. It should not take that long.

Mike.

(in reply to 14th_Reaper)
       Post #: 7

605 Centering issue - 6/18/2002 12:19:14 AM   
14th_Reaper



Posts: 374
Joined: 2/19/2002
From: Tulsa, OK, USA
Status: offline 		Thanks for replying Mike.

The control rods in use were 3 1/8 inch long on the ailerons and a pull pull sustem on the rudder and elevator. The ailerons were the biggest source of the problem. They were not used in the outermost hole but the 2nd outermost. They were not direction specific as to when they would not center. If I pushed an aileron up if would stay up a fraction. If it was deflected down it would stay a fraction down. As these were my first ever Hitecs they have left a rather bad taste in my mouth due to the destruction of my DP Ultimate. I don't think they contributed solely, but I do think they contributed.

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       Post #: 8

605 Centering issue - 6/19/2002 3:39:26 AM   
Rcpilot


 

Posts: 6412
Joined: 3/20/2002
From: Arvada, CO, USA
Status: offline 		Just to clear the air here. My comments about my linkages.

I am using Dubro 4-40 ball swivels at the servo horn with a Rocket City control horn and all 4-40 rods for the linkage.

ABSOLUTELY ZERO FLUTTER or FLEX in any way shape or form. This setup is bulletproof, in my opinion.

My servos are still centering poorly. I can't fly the plane. It's not worth the risk.

Hitec does market these 605BB plastic geared servos as a High Torque unit that is perfectly adequate for a plane up to 1/4 scale.

They are not even close to the performance that I expected when I purchased them.

I am sending mine back to Hitec and see if I can trade up to some digital ones. I'll have to shell out a few more bucks to get the upgrade, I'm sure. But it will be worth it.

I'm so dissapointed with these 605BB servos. Not what I expected at all.

_____________________________

Airplanes have expiration dates. It''s just not printed anywhere on them.
I''m not really an airplane pilot; but I did stay at a Holiday Inn Express last night.

(in reply to 14th_Reaper)
       Post #: 9

605 Centering issue - 6/19/2002 6:20:44 AM   
14th_Reaper



Posts: 374
Joined: 2/19/2002
From: Tulsa, OK, USA
Status: offline 		I also am willing to pay to upgrade to a better servo. If I have the option I will..

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       Post #: 10

Got my 605BBs back from Hitec - 9/30/2002 4:39:39 AM   
Rcpilot


 

Posts: 6412
Joined: 3/20/2002
From: Arvada, CO, USA
Status: offline 		Well, I got my 605BB servos back from Hitec on Saturday 09-28-02. I put them all back in the plane and checked the plane out.
I'm flying the Sig Cap 231 Breitling ARF 1/4 scale. I got one servo for each elevator half, one on rudder, and one on each aileron. I'm running a 6volt pack with a JR R600 reviecer.

THESE SERVOS ARE WORSE THAN THE ONES I SENT BACK TO HITEC FOR SERVICE!!!!!!!!!!!!!

I almost lost my plane today!!!!! I just barely got the plane around one time and made a horrible landing. The plane was pitching and rolling around the sky like a beached whale. The servos were jumping all around. The aileron servos won't center and one elevator servo just died.

This is completely REDICULOUS. I'm mad as hell!!!

What does Hitec have to say about this?

I want my money back.

I'm sticking with JR servos from now on. Yeah, the JR servos cost a bunch- but I'll bet they work like a servo is supposed to.

We have a frequency scanner at the field. Myself and two other guys checked my frequency after I landed my plane. Nothing on my channel. Nothing at all. So, I KNOW this wasn't radio interference. We checked all my switches with a meter. We checked the reciever. Everything is fine, except for the servos. We couldn't even get a 10millisecond deadspot in any of my radio equipment.

Mike?

_____________________________

Airplanes have expiration dates. It''s just not printed anywhere on them.
I''m not really an airplane pilot; but I did stay at a Holiday Inn Express last night.

(in reply to 14th_Reaper)
       Post #: 11

605 Centering issue - 9/30/2002 5:22:29 AM   
Dazzler



Posts: 1471
Joined: 1/5/2002
From: Bedford Heights, OH, USA
Status: offline 		Which servo horns are you using? Daz...


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Freya
YS80

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       Post #: 12

servo horns - 9/30/2002 9:19:24 AM   
Rcpilot


 

Posts: 6412
Joined: 3/20/2002
From: Arvada, CO, USA
Status: offline 		I'm not using some huge 2" servo horns on these servos.

I'm using standard horns.

I've kept up with this thread and read your posts about servo horn length, Dazzler.

In my opinion, it shouldn't make one bit of difference what servo horns I'm using. A servo either centers; or it doesn't.

I use long servo horns on standard JR servos (JR517). The JR servos always come back to dead center. And the 517 is a cheap standard servo. Why does it center better than these 605BBs?

I could understand it; if the servos were centering maybe 1/32" off either way with long servo horns. But I'm talking about 3/8" here; with standard servo horns. I'll bet the JR servo wouldn't be that far off if I had used a 12" servo horn.

The problem with these 605 servos is not in the length of the horns. The servos will not return to the same place twice.

Reaper described the exact same problem I'm having.

When you move the aileron stick to the right; the right aileron goes up and the left one goes down. When you let go of the stick, the right one comes past center and is low by almost 3/8" and the left one is high by almost 3/8".

Move the sticks in the opposite direction and the left one is low and the right one is high by 3/8".

I've used sub-trim to reset everything back to centered, and then moved the sticks: same thing happens. I've adjusted the linkages manually, and set everything to neutral, and then moved the sticks: same thing happens.

I've zeroed the computer TX and started from scratch. I adjusted all the linkages manually, so that no computer trims were required for a neutral setting. Move the sticks and everything is all whacked out again.

It's BS. It's not the length of the horns I'm using. It's the servos.

_____________________________

Airplanes have expiration dates. It''s just not printed anywhere on them.
I''m not really an airplane pilot; but I did stay at a Holiday Inn Express last night.

(in reply to 14th_Reaper)
       Post #: 13

605 Centering issue - 9/30/2002 4:21:37 PM   
Dazzler



Posts: 1471
Joined: 1/5/2002
From: Bedford Heights, OH, USA
Status: offline 		Was just asking.

If your using the std horns, then they should work. I was just saying that if you do put an extra long horns on the servo, it does exaggerate the non centering issue. All I can tell you is that I'm using them with no problem, and also using a 6volt pack which again shouldnt matter. I have a freind that is using 5 or 6 of these on his 60 size ship, and they were not centering exactly back to nuetral on the ground, but they flew fine. I would send them back, and upgrade to a different servo. Daz...


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Freya
YS80

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       Post #: 14

605 Centering issue - 9/30/2002 9:42:02 PM   
MikeMayberry



Posts: 2823
Joined: 1/15/2002
From: Poway, CA, USA
Status: offline 		Rcpilet- Sorry to hear about the situation. The 605 is one of Hitec most popular servos and what you are explaining does not sound normal. Have you tested the centering without having the linkage attached? Where are your linkages attached on the control horns on the servo and surface. If they are connected to the outer on the servo and inner on the control surface then any centering issued would be exaggerated. Contact the service department @ (858)748-6948 to discuss a solution to your problem.

Mike.

(in reply to 14th_Reaper)