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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 >> 5975 KARBONITE Question
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5975 KARBONITE Question - 9/4/2003 7:49:49 PM   
jtholley03



Posts: 187
Joined: 12/11/2002
From: haymarket, VA, USA
Status: offline 		I am reading about Karbonite output shafts snapping. I have three 5975's on the tail of Sig Cap. What is the official stance on this problem?

Thx

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5975 KARBONITE Question - 9/4/2003 10:07:53 PM   
MikeMayberry



Posts: 2822
Joined: 1/15/2002
From: Poway, CA, USA
Status: offline 		We are evaluting the situation. The hand full of failures we have seen have come from high vibration applications. We're flying the 5975's in a 1/4 scale cap and have had no problems.

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5975 KARBONITE Question - 9/5/2003 5:26:29 PM   
P-51B



Posts: 6131
Joined: 10/11/2002
From: An Iceburg in, ANTARCTICA
Status: offline 		What, exactly, are you defining as a "high vibration application"?

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5975 KARBONITE Question - 9/5/2003 9:29:25 PM   
MikeMayberry



Posts: 2822
Joined: 1/15/2002
From: Poway, CA, USA
Status: offline 		Throttle and one in a heli.

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5975 KARBONITE Question - 9/5/2003 9:32:55 PM   
P-51B



Posts: 6131
Joined: 10/11/2002
From: An Iceburg in, ANTARCTICA
Status: offline 		I'll have to watch this issue carefully, since I just bought two of these.

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5975 KARBONITE Question - 9/6/2003 5:58:13 AM   
mglavin



Posts: 5200
Joined: 11/29/2001
From: Elverta, CA, USA
Status: offline 		I have four of the 5975's on throttle in 40% models. Probably well over 50 flights on a few of them. So far so good. I really like them. Smooth and fast!

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RE: 5975 KARBONITE Question - 9/22/2003 10:44:32 PM   
KAD


 

Posts: 6
Joined: 10/21/2002
From: Jamestown, RI, USA
Status: offline 		Hey Guys, I just got a response from Hitec Service saying that the output shaft failures were due to useing Locktite on the screws that hold the servo arm to the shaft. The implication was that the chemicals in Locktite weakened the Carbonite shaft.

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RE: 5975 KARBONITE Question - 9/23/2003 1:27:09 AM   
Geistware



Posts: 12946
Joined: 4/9/2002
From: Locust Grove, GA, USA
Status: offline 		Why would someone want to put loctite on composite threads?

quote:

ORIGINAL: KAD

Hey Guys, I just got a response from Hitec Service saying that the output shaft failures were due to useing Locktite on the screws that hold the servo arm to the shaft. The implication was that the chemicals in Locktite weakened the Carbonite shaft.


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RE: 5975 KARBONITE Question - 9/23/2003 1:49:22 PM   
wene71



Posts: 44
Joined: 2/15/2003
From: clairmont, AB, CANADA
Status: offline 		Well what servo are you suggesting for a 90 size heli, to change to ?

Im Glad you are publicly stating this, I remember when JR were saying the 8411 had no trouble even with high complants.

Thanks.

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RE: 5975 KARBONITE Question - 9/23/2003 4:53:25 PM   
MikeMayberry



Posts: 2822
Joined: 1/15/2002
From: Poway, CA, USA
Status: offline 		The 5945's and 5925's are the best servos we have. After some testing we have found that replacing the stock screw with on 2mm longer eliminated the output shaft problem. We are waiting on new screws and will send out replacments when the become available. The stock screw length is 8mm so if you do replace the screw yourselves it should be no more than 10mm long. We will make an official anouncement about this shortly when they confirm the exact screw size.

Mike.

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RE: 5975 KARBONITE Question - 9/23/2003 4:58:32 PM   
mglavin



Posts: 5200
Joined: 11/29/2001
From: Elverta, CA, USA
Status: offline
quote:

Hey Guys, I just got a response from Hitec Service saying that the output shaft failures were due to useing Locktite on the screws that hold the servo arm to the shaft. The implication was that the chemicals in Locktite weakened the Carbonite shaft.


One should NEVER use Loctite or anything similar with plastic components of any composition. As mentioned above Loctite or similar will react with the plastic, I believe it causes the plastic to become brittle.

Use something like Shoe Goo, PFM or Zap a Dap Goo. I use this on all servos screws metal or plastic geartrains. This provides a resilient or elastic type retaining component which is easily broken loose, unlike when you get carried away with Loctite type products.

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RE: 5975 KARBONITE Question - 9/24/2003 12:43:25 PM   
P-51B



Posts: 6131
Joined: 10/11/2002
From: An Iceburg in, ANTARCTICA
Status: offline
quote:

ORIGINAL: KAD

Hey Guys, I just got a response from Hitec Service saying that the output shaft failures were due to useing Locktite on the screws that hold the servo arm to the shaft. The implication was that the chemicals in Locktite weakened the Carbonite shaft.


Good to hear there is a cause, and I shouldn't have to worry since I don't put locktite on 'em!

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RE: 5975 KARBONITE Question - 9/29/2003 5:18:22 AM   
akflyer



Posts: 584
Joined: 1/24/2002
From: Soldotna, AK, USA
Status: offline 		It even happens with out loctite. I saw one snap yesterday on an aileron. No locktite was used.

I was going to put these on my heli but now am not sure if I want any more.

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RE: 5975 KARBONITE Question - 9/29/2003 5:46:43 AM   
mglavin



Posts: 5200
Joined: 11/29/2001
From: Elverta, CA, USA
Status: offline 		Mike Mayberry suggested the following previously. This makes sense as the 2mm longer screw extends into the shaft below or past the gear spline.

After some testing we have found that replacing the stock screw with on 2mm longer eliminated the output shaft problem. We are waiting on new screws and will send out replacments when the become available. The stock screw length is 8mm so if you do replace the screw yourselves it should be no more than 10mm long. We will make an official anouncement about this shortly when they confirm the exact screw size.

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RCU Community Moderator
Hitec * Multiplex Field Representative

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RE: 5975 KARBONITE Question - 9/29/2003 6:21:17 AM   
akflyer



Posts: 584
Joined: 1/24/2002
From: Soldotna, AK, USA
Status: offline
quote:

The 5945's and 5925's are the best servos we have. After some testing we have found that replacing the stock screw with on 2mm longer eliminated the output shaft problem. We are waiting on new screws and will send out replacments when the become available. The stock screw length is 8mm so if you do replace the screw yourselves it should be no more than 10mm long. We will make an official anouncement about this shortly when they confirm the exact screw size.



Are we talking about putting longer screws in the 5945's and 5925's or the Karbonites ???????
I will fix another drink while you reply

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       Post #: 15

RE: 5975 KARBONITE Question - 9/29/2003 6:34:07 AM   
mglavin



Posts: 5200
Joined: 11/29/2001
Fr