Stepper motors for building a elderly lift

Hi, I would like to build a robot-like helping device for people who have trouble getting up from a chair or other situations. I just wanted to know if you have ever tested different steppers for the weight that they can handle?(Dumb question ) The reason why I want to use steppers for this project is because older folks need to take a moment to get their balance. I know that I can make these motors work harder with less stress by using either gears or a pulley system. I want to have a camera, a Wi-Fi connection and control from the Internet. Anyway, I’m not asking you to write anything because I can do that, I’m asking you which motor, if any, of the steppers available that you would suggest using in my project. Any other suggestions will be greatly appreciated. Thanks! Example: Motor(s) that can handle 150 to 180lbs of lift as well as hold.

-RANDY

 

My second design is to assist a person that has fallen has NOT been hurt but they are unable to stand on their own. So, I want to build a seat as close to the floor as possible and use a scissor-lift style using Ball & screw mechanical lift along with two C-Beam extrusions with the same Ball and Screw drive. I know that this is vague, but I haven't computer generated my sketches, yet. I have some high torque stepper motors from other projects that I wanted to try and also have extrusions. I guess that I just want to know what the strongest stepper motors are available before I get into the physics of my application. I'm sorry if I'm not being clear enough or not providing enough information. A lot of this process is still in my head. Thanks, -RANDY

 

Thank you so much for the information, Peter, it was actually very helpful. And thanks to Rob Stehlik for his due diligence in performing the tests and hard work that he put into it as well. I will post my project when I finish, or I may post my progression throughout the whole project. I hope that it turns out the way I want, and I may have to try, try and try again until it satisfies my mild case of OCP disorder.

-RANDY