lifting mechanism

for general robots made for simple competitions where the load to be lifted is  ot very high, it is best to go for a simple arm that can provide motion in an angular direction

for this,the gripper is placed at one end of a flat plate(or somethig that can be used as an arm).The other end is connected to a motor shaft.By controlling the direction of rotation of the motor,the arm can be rotated and used to lift any object

the limiting factor in this design is the load that is to be lifted.

Suppose a load of 1kg is to be lifted and the gripper is mounted at the end of a 10cm long arm..

So,i will need a motor that can provide a torque of 1*10=10 kg.cm

So,as the load increases or the distance of the load from the motor axis(=the length of arm) increases,it becomes more and more difficult to pick up things this way

So,for higher load applications,it is best to go for a rack & pinion mechanism or a screw mechanism or a pulley-thread mechanism or a timing belt mechanism

If you can give a specific application of what you want the bot to exactly do(like type of load,exact shape,space constraints etc) it would be easy to decide exactly what mechanism to use

thnx reckless i ll soon give the post the specs of the bot, busy with exams abhi..

If your problem statement says to lift it uward and place it somewhere at the top you can use the lift mechanism by a single motor and the pilley mechanism..its the simplest one to manipulate.

Different shapes and size can pose a problem. You may lift  it , but grabbing it initially is the main problem.

Ya it does.. it all depend on the problemstatement...