Again - you need to define it.
What are you going to grab and put back - shape & materials can have an effect
how heavy is it
what are you going to use to "grab it" AND let go
how is the arm going to find it
how is it going to find the destination and at what precision and how fast -what about latency issues etc?
what servo's do you have and how many -
There's a basic intro to "degrees of freedom" here:
https://en.wikipedia.org/wiki/Degrees_of_freedom_(mechanics)
You need to define the parameters then choose the tech capable of doing it. we cant say
if a particular chip can do a job without the job definition. You may only need a simple controler (I wouldnt use that particular chip -
there are better PIC's and similar or lower price with regard to PWM) OR you may find a specialist servo controler can do the job better for you.
"just grab and place back an object" is not as simple as it sounds -
On the other hand if you're just playing around to experiment - try it and see what you can make it do.
You could get really clever.
I suspect however - some more reading up will help you work it out then you can come back with specific
questions that we can answer.