Old 10-25-2011, 03:56 PM
  #10  
AEAJR
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Join Date: Aug 2005
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Originally Posted by Rodneh View Post
All servos have bearings, even the cheapest ones. Usually the less expensive are sleeve bearings and the more expensive have ball bearings.
snip...
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While one could say that you can not build a servo without some kind of bearing surface, and I would agree, the servo MFGs clearly draw a distinction between their servos which have bearings and those that do not.

That is the basis of my post.

Here are examples of servos listing bearings and those that do not. Hitec, Futaba and HXt draw a distinction between them in how they list their products. And I have seen a degradation in the non-bearing servos over time resulting in dual centering. The ball bearing servos seem to hold up better over time.

Here is how 3 MFG list their servos.

HS-81
http://www.hitecrcd.com/products/ana...ini/hs-81.html

Bearing type = none.

You can find the same assessment for some of their other servos.


HXT 9g servo - no bearing referenced
http://www.hobbyking.com/hobbyking/s...cro_Servo.html

However this HXT servo does list bearings
http://www.hobbyking.com/hobbyking/s...ing_servo.html


Futaba S3003 - No bearing referenced
http://www3.towerhobbies.com/cgi-bin...&I=LXH288&P=ML

Futaba S3004 - Ball Bearing servo
http://www3.towerhobbies.com/cgi-bin...&I=LXVW07&P=ML
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