setting time for first part altering the program and then  
run the part  after roughing only 0.1 stock for finishing 
tool so chattering came in finished part so for that part 
polishing the chattering and it will become 0.1 over sized
for that part without identification move to for next setup.in that set up they are maintaining the total length for all parts in same size so thickness 6mm -0.1 under sized so part rejected.
