5945 mg servo inaccurate?  
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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 >> 5945 mg servo inaccurate? Page: [1]

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5945 mg servo inaccurate? - 7/21/2005 3:49:31 PM   
b-mccor8



Posts: 271
Joined: 8/1/2002
From: PA
Status: offline 		I bought 4 of these servos 1 yr ago. I have about 15 normal flights on them, I cannot 3d. I have on the control surfaces a 3/8 play out of all these servos. I trace it down right to the servo. no linkage play at all. This is on a 28% plane. It makes setting up dual elevators and accuracy impossible. When I contated hitec through e-mail they told me ya its gear slop. Thats it so now what. I remember them being this way from new. Gear slop so now what i am stuck with servos that won't center properly won't always travel the same and give on pressure. So fly them this way???? do I really trust this??? I guess my next choice will be with jr equipment Maybe they give me what I payed for. Brenden

< Message edited by MikeMayberry -- 7/21/2005 9:03:51 PM >

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RE: 5945 mg servo inaccurate junk - 7/21/2005 5:44:57 PM   
jpmcclary


 

Posts: 102
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From: Punta Gorda, FL, USA
Status: offline 		Have you tried to reprogram them?

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RE: 5945 mg servo inaccurate junk - 7/21/2005 6:31:47 PM   
b-mccor8



Posts: 271
Joined: 8/1/2002
From: PA
Status: offline 		as far as what? I set centers and end points. I have not set nor checked deadband. Hitec told me that would solve my concern. But you move the elevators three four times they don't line back up. same with max throws. keep the stick position there and push the play out of the flaps and you can line them up. I JUST CAN'T BELIEVE these are worn out already that just isn't possible. they haven't been used that much. And all of them to be pretty much the same. elevators and ailerons??/?/ I don't know

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RE: 5945 mg servo inaccurate? - 7/22/2005 9:35:02 PM   
MikeMayberry



Posts: 2823
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From: Poway, CA, USA
Status: offline 		It's very unlikely that the gears would be worn after 15 flights or that the gears had slop when brand new. What horns are you using? There must be another explaination here... the 5945's are well accepted in the industry as top of the line and offer excellent centering, resolution and gear wear.

Be aware that the 5945's are comparable to the JR 8411's which are well know for premature gear wear. The Hitecs have a much better reputation here so to say that swiching to JR will be better is not necessarily true. The new 8611's are better but they compare to the Titanium geared 5955's where Hitec has the advantage here too.

Mike.

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RE: 5945 mg servo inaccurate? - 7/22/2005 10:30:07 PM   
b-mccor8



Posts: 271
Joined: 8/1/2002
From: PA
Status: offline 		Mike,
let me say that first I think the support I received from the hitec websight was terrible. The only answer I received is it's gear slop. Boy what help they were.
Anyway, I am trying to trace this down. I had factory 1.5 in. heavy duty hitec horns on the servo. I now have replaced them with aluminum. still the same. I am now going to replace the only other option which will be the hanger nine ball links that are attached to the control horn. Brenden

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RE: 5945 mg servo inaccurate? - 7/22/2005 11:42:09 PM   
mglavin



Posts: 5200
Joined: 11/29/2001
From: Elverta, CA, USA
Status: offline 		To clarify, you can move the servo horn 3/8" back and fourth at the output shaft? Are you sure there is not slop somewhere other than the servo gear-train?

I have hundreds of flights on these servos with very little gear-train wear fitted in 40% models.

The link below is a two year old 5945 removed from Josh's 2004 XFC Competition Extra. As you'll note, these servos center very accurately. The only deviation is yours truly man handling the DV camera.

Servo Resolution link

< Message edited by mglavin -- 7/22/2005 11:46:32 PM >

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RE: 5945 mg servo inaccurate? - 7/23/2005 1:26:00 AM   
b-mccor8



Posts: 271
Joined: 8/1/2002
From: PA
Status: offline 		I will post some picks of the play I have at the control surface. I replaced the hitec arms with aluminum ones. I also replaced the ball links . It is the exact same. Before I do anything else I am checking the deadband. TRUST me I cannot believe the amount of play out of these servos. By the time it reaches the elevator it is alot. I don't trust this much movement in a 3000.00 plane. I am not a wild 3d pilot. these have been flown fairly gingerly. As far as the video goes thats great but that don't help my problem. I believe there good servos thats why I bought them. I just cannot believe this. Brenden

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RE: 5945 mg servo inaccurate? - 7/23/2005 1:43:19 AM   
mglavin



Posts: 5200
Joined: 11/29/2001
From: Elverta, CA, USA
Status: offline 		Changing the deadband will have no effect on slop realized, be it gear-train wear, linkage or surface induced. The "slop" is a mechanical thing shortcoming.

Remove the linakge from the servo and see if the 3/8" slop you note is present. I'd be surprised if it was.

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RE: 5945 mg servo inaccurate? - 7/23/2005 2:41:30 AM   
b-mccor8



Posts: 271
Joined: 8/1/2002
From: PA
Status: offline 		I have the servo arm only on the servo. I have some small movement. Exceptable???? I think. Now I have replaced the horns on the elevator and it cut the play I would say in half. Would you except some play in the elevator?????????????? the deadband as you said had zero effect.

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RE: 5945 mg servo inaccurate? - 7/23/2005 3:36:11 AM   
mglavin



Posts: 5200
Joined: 11/29/2001
From: Elverta, CA, USA
Status: offline 		A small amount of play is normal with metal-geared servos.

Any slop is amplified, from every source with the linkage in play. Longer linkage arms and offsets reveal or amplify the original slop. Please post picture of your setup. What length are the control arms, measure from the hinge centerline to the control link pivot point. What length servo arms? What type or brand elevator control arms and linkage components are utilized?

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RE: 5945 mg servo inaccurate? - 7/25/2005 3:10:30 AM   
b-mccor8



Posts: 271
Joined: 8/1/2002
From: PA
Status: offline 		Micheal here are some pics of my changed set up. I cut down the play by half to maybe an exceptable 1/8 play at the elevator it self. the last pics are of some components I changed. I didn't see play in them but changing them wound up making a difference.

Attachments
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RE: 5945 mg servo inaccurate? - 7/25/2005 3:11:54 AM   
b-mccor8



Posts: 271
Joined: 8/1/2002
From: PA
Status: offline 		the third pic above I tried changing to that style end but didn't like how the nut for the screw spun. So in the trash

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RE: 5945 mg servo inaccurate? - 7/25/2005 3:13:29 AM   
b-mccor8



Posts: 271
Joined: 8/1/2002
From: PA
Status: offline 		here is the part I changed that seemed to make the biggest change.

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RE: 5945 mg servo inaccurate? - 7/25/2005 4:04:38 AM   
mglavin



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Joined: 11/29/2001
From: Elverta, CA, USA
Status: offline 		Looks good.

What length is the servo arm and what is the distance between the hinge line and control arm pivot point centerlines?

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RE: 5945 mg servo inaccurate? - 7/26/2005 3:06:35 AM   
b-mccor8



Posts: 271
Joined: 8/1/2002
From: PA
Status: offline 		I will try to answer this the best I can. The servo arm is 1 1/8 from the center screw to the center of the ball link.
From hinge line to pivot on the elevator horn is 1/2 inch(meaning my pivot is not on the hinge line)
An last 7/8 from the hinge centerline to the actual bolt that comes down from the elevator
Anything else I missed let me know?

So I guess the 1/8 play out at the elevator is ok, (normal)??

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The wife said,"If you go flying one more time I'm Leaving you". Man, I'll miss her??

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