Sorry for replying a little late. i chose wood for this purpose. I have now designed the arm, it's all wood now. The length of wooden towers where the arm is screwed is about 65 cm. The length of the arm where grabber is placed is about 60cm. Lets visualise it, Their are two wooden pieces of length 65cm which are glued to base at 90 degree. at the top of these pieces their is a wooden hub which is holding the tower at sides and at the middle of this hub i have 3 arm size square holes. Via this hub the arm motion is free.
i have made a moving base of 30*25 (cm). I have placed a motor @3v at each corner of base with 4 tyre each for giving full support to the bulky machine.
Now the problem is at large related to pulley these hot woods. For this as of now i have buyed a printer motor @24v. I have built a remote. Another thing that is watchworthy, is the 24V maximum power used in the machine.
For a constant power supply i have used a step down transformer and made a full wave rectifier circuit to get a constant supply of voltage.
my machine survives on two motions namely lifting of arm up vis-a-vis down and motion of the wooden grabber i.e. Open and close.
The problem area that i wish to consult
, how can i make a pulley that lifts the arm, using printer motor ?
Another question of same nature is how can i use a simple DC motor @ 3v to implement a open and close.
Note: The opening and closing of the jaw in this machine is entirely based on pulling of middle arm piece( i have three side to side placed wooden pieces that make the arm)
So i need some rough idea how i am going to implement the pulley action and the jaw mechanism via motors.
Please reply soon.... thanks in advance......