I want to build an R/C 6 DOF Robotic Arm
I am using 2.4 Ghz Radio Link 6ch Radio
Which servo Motor will work for this
I have
1. Turnigy TGY-S902 Metal Gear Digital Robot Servo
2. Turnigy TGY-S801D Digital Robot Servo
3. Turnigy TGY-8103 Metal Gear Digital Robot Servo
4. Turnigy TGY-S901D Metal Gear Digital Robot Servo

can I use anyone of these or do you suggest some other?

and does anybody know how to make a gripper or find one??

I have attached the pics of the arm i want to build

And i want to build a Motion Controller too like shown in the pic (blue one) 

Hi Gagan,

i build a 5DOF robotic manipulator/arm a while back, which was controlled by a TGY9X running ER9X firmware initially and lateron I developed an Arduino based controller for the arm. As fas as servos are concerned, you can use any depending upon your torque and load requirements, but generally digital ones are preferred in robotic applications due to there better reaction time. Although I've seen some people using special servos in robotics application which have a position feedback wire rubbing from the servo to the controller, which helps in implimentation of a closed loop controll architecture. 

And as far as grippers are concerned you can find some on stores like www.nexrobotics.com etc, but it is always good to design the gripper yourself based on your specific requirements.

Tell me more about your project, and what exactly you are expecting this arm to do, may be I can be of some help

cheers
Bilal

Thanks Bilal,
the website you suggested is really good.

Can you also suggest me about the arm controller?
and as to the purpose of this arm I am making it just for fun.
It is not really an arm but more like a defense robot (I have uploaded some pics of it)
I will be using two radio controllers one with 6ch (radio link) and the other with 9ch (Fly sky)
can you suggest me which one should use for the arm and for the vehicle part below

I'll appreciate your help very much

See, I'd suggest you should use the Fly-sky one to controll the arm, the thing is 6 channel radios have only 4 independent channels, the other two are either switch or trimpots mixed with some existing channel. Fly-sky too is no exception to this but you can reflash it with Er9X firware, thet allows you to use the trimpots as independent channels, but reflashing is a tricky deal and could potentially damage your radio, so only try it if you know what you are doing.

Besides, don't you think operating two radios simultaniously would be a handfull?

If you can reflash your 9ch Fly-Sky, then we can work something out.

Cheers
Bilal

And FYI, I too build something quit similar to what you are trying to build here, although the arm was no where as neat as the ones in the pic, but it workd great:)

Feel free to suggest anything else, I'll appreaciate it.
Thank you, Bilal.

Bump

Coincidentally, I'm working on a bionic arm too, just the palm and fingers. It should make a nice end effector for your  robotic arm.

Everyone concentrates solely on the servos while designing these kind of arms and spare little thought for the power supply. Remember that these servos need a very clean (low noise) power supply of 5V (sometimes 6V) that can provide several amps. A bad power supply will cause frustration

Trishit, i used an ESC and aa lipo to power my servos, worked pretty well...... what else one can use, any suggestions?

I used a LiPo to power 5 servos and it made my Uno go nuts. Servos need decoupling.
Then, I tried a desktop PSU, it worked fine, even without decoupling. I don't know how though.

You got lucky Anjan Most high torque servos need 6V to work at full capacity. You may get switching BECs from HK. They work fine. If efficiency is not a factor then you might try making your own supply. A 7806 for each servo and a helluva lot of capacitors for decoupling. If the servos jitter still, put the arduino on a different power source altogether. Just share the ground lines between all the supplies.