Chai is complex to make. It involves many spices, all ground and roasted differently. You will not find a robot arm that does this for you. You could buy a robot for $4000 or so - maybe up to $20000, however this robot will not know what to do. As another commenter said to you previously, the arm is only part of the process.
May be time to give up on robot arms and accept that humans are the right people to make some things. Good luck and think about moving on.
