Need help with structure of stair climbing robot

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The discussion focuses on designing a stair-climbing robot, highlighting challenges with the mechanical structure compared to electrical and programming aspects. Key insights suggest that two motors are positioned centrally to facilitate sliding motion, possibly using a belt or chain system. The motion could also be achieved through a rack and pinion design, offering an alternative to the belt mechanism. There is uncertainty regarding motor attachment to the wheels, which remains a point of confusion. Overall, the conversation emphasizes the need for clarity on the mechanical components to achieve effective movement.
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Im supposed 2 design a robo like this 1, but here, the mechanical part seems more tought thn the electrical and programming. I couldn’t make out what mechanical structure is being used to have this type of motion. Can anyone please help.



Here’s a start:
There r 2 motors attached in the centre part of the robot, which keeps sliding back anf forth.
But, I can’t figure out out is the motor shaft being coupled to the structure, and how does it have tht kinda motion.

 
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The sliding motion looks to be from a belt or chain. Utilizing a stepper motor with a chain or belt would allow you to count how many steps it takes to move a fixed point on the chain from one end of the track to the other. The fixed point on the chain or belt is attached to a pivoting mechanism (probably another stepper motor) within the body of the robot... inside the track that it slides on is probably a wire ribbon similar to that of the inside of a printer which would power the motors for the wheels. That's just me dissecting it with my eyes though.

OR... if you don't want to use a chain or belt, you can make a rack and pinion design to create the sliding motion.
 
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thnx
 
i can't see any motors attached to da wheels, r thr motors?
 

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