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Old Nov 30, 2011, 10:46 AM
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Boulder, CO USA
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Question
servo conversion table

Does anyone know a servo conversion table, which will compare same dimension and torque servo, but different brand? I know the recommended servo, but I would like to choose them by myself. It will be time consumming to find replacement. Thanks,

Xiaoyu,
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Old Nov 30, 2011, 11:20 AM
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San Pedro,Ca
Joined Sep 2004
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Quote:
Originally Posted by xiaoyu80305 View Post
Does anyone know a servo conversion table, which will compare same dimension and torque servo, but different brand? I know the recommended servo, but I would like to choose them by myself. It will be time consumming to find replacement. Thanks,

Xiaoyu,
Check this place out
http://www.servodatabase.com/servos/all
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Old Nov 30, 2011, 12:27 PM
hul
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Switzerland
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or this: http://wiki.rc-network.de/index.php/Kategorie:Servos

Hans
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Old Nov 30, 2011, 01:06 PM
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Quote:
Originally Posted by xiaoyu80305 View Post
Does anyone know a servo conversion table, which will compare same dimension and torque servo, but different brand? I know the recommended servo, but I would like to choose them by myself. It will be time consumming to find replacement. Thanks, Xiaoyu,
As in posts #2 & #3 , see also the servo databases under sub section
"Servo - Alterations, Calculators, Databases, Leads, Repairs, Convert to an ESC or winch & FAQ." at
Alan's Hobby, Model & RC FAQ Web Links (quick search = Ctrl+F)

NB: Direct comparisons are difficult because manufacturers use different ways of measurement to obtain their quoted values.

1. Manufacturers quote "torque" as either Stall Torque or Holding Torque but do not disclose which on their specification sheets.
Without knowing which is which, the comparison charts are very misleading. Hitec RCD rate their servo torque as stall torque.
[Holding torque can be 2 -3 times that of the stall torque. Adjusting the speed of a digital servo via a programmer does not effect the torque.]
Servo - FAQ : Torque Tester - DIY
. The charts give no indication of motor nor gear quality.
. There is a trade off between both weight & size. Indirect drive requires more space and more gearing.
Never test a servo by pressing down on an output shaft which effects any direct drive pot to varying degrees, causing it to try and recenter or hold a position when powered on. Finger pressure can well exceed the limits of a servo,refer especially
Digital Servo Burnout... also applies to analogue servo.
2. Cheap servos invariably use cheaper motors (which cause many BEC/Brownout problems) and do not have long lasting pots.
All Hitec cored servo motors use incredibly strong Neodymium rare earth magnets, also known as “supermagnets”,.
Cheap "MG" servos with molded (compressed metal particles) alloy gears usually have a very light short lived hardening coat, not to mention the typical gear assembly of cheaper units, including some sold under rebadged "USA Brand names", for example:
Review: Corona DS 538MG servo
Please refer to:

Servo - FAQ - Which servo to buy - Peak Servo Current Test Results.
Servo - FAQ : Metal Gear Servos - Why good MG Servo have a Plastic Primary 1st Gear
Servo - FAQ : Metal Gear Servos - DIY Repair & Extend MG Servo Gear Life
Servo - Horn Arm Spline Count and Inter Brand Compatibility

In the “servo world” you generally do get what you pay for.

Alan T.
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Old Nov 30, 2011, 01:47 PM
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In the “servo world” you generally do get what you pay for.

Alan T.[/QUOTE]

Thanks A.T. for all the information.
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Old Nov 30, 2011, 01:55 PM
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United States, TX, Round Rock
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Quote:
Heavy Duty Servo Wire Leads

High power digital and analog servos need plenty of current to deliver massive power. Recognizing this, Hitec increased the size of the wires from 22 to 24 gauge to provide the power these servos need to perform at the highest level.
So which one is it? They increased the size of the wires making them thicker or went from 22 to 24 gauge? 24 gauge is thinner wire than 22 gauge.

This is what an ad is - marketing BS. The truth... who knows what it is?
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Old Nov 30, 2011, 02:05 PM
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The higher the gage number, the smaller cross sectional area of the wire. 24 gage is smaller than 22 gage.
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Old Nov 30, 2011, 05:21 PM
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Originally Posted by ivanc View Post
So which one is it? They increased the size of the wires making them thicker or went from 22 to 24 gauge? 24 gauge is thinner wire than 22 gauge. This is what an ad is - marketing BS. The truth... who knows what it is?
Quote:
Originally Posted by Rodney View Post
The higher the gage number, the smaller cross sectional area of the wire. 24 gage is smaller than 22 gage.
Typo, probably reversed when translated but a good pick up.. Hitec servo use 24 & 22 guage for servo leads.

Alan T.
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Old Nov 30, 2011, 11:54 PM
fmw
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I haven't been in the hobby long enough to wear out any servos. My most used plane only has about 70 flights on it. However, I can say that I've used Hitec servos mostly and have had as many failures per capita as I have with cheaper brands. Admittedly I haven't used digital servos but do use metal gear servos most of the time.

If the issue is longevity then one would really need to have more information to make an informed decision. I don't know whether the Hitec will last 3 or 4 times longer since they have a 3 or 4 times higher sellng price. If the issue is reliability, I haven't found the cheaper servos to be less reliable.

My guess is that the claim of superior materials in the Hitec should account for a higher price but not a 3 or 4 times higher price. I think the major difference is in advertising, general overhead etc. etc.
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