I am designing a robotic arm which will be attached to a fixed base. I would like to have the ability for the arm to elevate between 12 to
You might try setting/mounting the base for your robot on top of an old carjack and run the screwdrive for raising/lowing the jack from a stepper motor. Just a thought...
--That would work but it wouldn't be real precise; i.e. I think it would wobble. To do it accurately you want the devce to be mounted on two vertical rails. Rails are usually precision ground steel rods, but crs would probably do fine. In industry where you'd want the thing to survive several million cycles the "car" that rides on the rails would have linear bearings, but bronze bushings or even nylon ones would be adequate.
You might want to look at linear actuators like below.
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