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Which is a better servo for Robotic arm ?

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Rohith_elec

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1, 5 KG - VTS-08A


Operating Voltage: 4.8-6.0V
STD Direction: Counter Clockwise / Pulse Travelling 800 to 2200µsec
Stall Torque: 5kg @ 4.8v, 6kg @ 6v
Operating Speed: 0.33sec/60 4.8v, 0.30sec/60 6.v
Weight: 43.g
Size: 43 x 23.0 x 38.2 mm


2, THS102_Servo (High Torque Metal Gear Servo 51g / 10.2kg)

Torque: 9.5kg @ 4.8v, 10.2kg @ 6v
Weight: 51g
Speed: 0.21 / 60deg @ 4.8v , 0.20 / 60deg @ 6v
Voltage: 4.8v~6v


kindly suggest any other Servo available in india
 

What is your power source? If it is on-board batteries, then you may want to choose the servo which draws less current.

If they both draw the same amount of current, then go with the stronger servo. 10.2 kg.
 

Its working on mains supply with adapter
 

Your choice depends largely on your design requirements, without knowing further details it is difficult to offer advice. Design specs such as range of motion requirements, battery or power supply ratings and details concerning the mechanical arm are vital.

Considering the choice of the two servos above, the THS102 clearly offers better performance in the areas of Torque and Speed over the VTS-08A. However the THS102 is 8g heavier and more than likely requires more current to perform within specifications.

You might find the following Guides on Choosing a Servo helpful:

Make Project - Servos

What You Need to Know about RC Servos!

**broken link removed**

Pololu RC Servos

BigDog
 
I want to build a generic robotic arm for my lab that can be modified later,
The power supply is based on a PC smps, so power rating may not be a problem.

Manufacturers says THS102 can lift 10.2kg , what can be the safest weight that can be lifted with it ?
 

Rohith_elec said:
Manufacturers says THS102 can lift 10.2kg , what can be the safest weight that can be lifted with it ?
Click to expand...

Actually, the manufacture spec is Torque not Mass/Weight and is properly expressed in Newton Meters (N*m), however it is typically expressed in units of kg*cm (SI) leaving out the acceleration or ozf*in or lbf*ft (UK or US).

Torque is a measurement of the strength of a servo. Torque is determined by multiplying the force acting on the servo arm by the distance from the center of the servo.
Click to expand...

Therefore the maximum amount of weight depends on the length of lever arm.

Reference: UNDERSTANDING RC SERVOS DIGITAL, ANALOG CORELESS, BRUSHLESS, Section: Speed and Torque Ratings
Torque determines the maximum amount of rotational force the servo can apply. This specification is measured in ounces per inch (oz-in) or in kilograms per centimeter (kg-cm). The larger the number, the more force the servo can exert. A typical standard servo will have a torque rating around 40 oz-in. A high torque specific servo can have torque values well over 200 oz-in.

So what exactly does 40 ounce-inches mean?

Well if you had a servo arm that was one inch long on your servo it would be able to produce 40 ounces of pull or push force at the end of the servo arm before stalling. If you had a 1/2 inch servo arm what do you think the force would be? Yup, 80 ounces of force. How about a 2 inch arm, 20 ounces of force - easy huh?
Click to expand...


BigDog
 
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