...
In terms of meeting the criteria, a more powerful motor can can be used. Alternatively, the implementation of gears to increase torque and reduce velocity without power changes would be a more effective approach. The PWM reduces the average power which affects both characteristics (reduction of torque is a massive disadvantage). The load requirements can be used by analyzing the dynamics of the chute as its own system and finding a material with an effective spring constant (N/m) that is low enough to provide substantial displacement, but also with meaningful tension to propel the chute forward. This can be done via material research and also by placing the right number of springs/bands in parallel to find an effective spring constant.
If more power and torque are to be provided, the links and cantilevered grabbing pushing arm should be reinforced. The most viable approach is a blend of increasing torque and reducing load requirements to automate the mechanism safely and reliably.
The Lazy Susan needs to be modified to allow for controlled discretized movements (much like a Geneva mechanism) and ratcheted so that it can only rotate one way, but not both. As an overhaul, connecting the motor system via pulleys and timing belts to automatically time a reload can be a massive substantial improvement but an error in motion can accumulate over time, which result in results in the firing and reload timing systems becoming out of sync. The use of more electronics such as actuators or servos, or bump switches in however manner to stop the system and initiate a reload can also be another approach, yet this comes at the cost of mechanical rigor and the ability to continuously operate the system under continuous input motion.
Additional improvements beyond this can include streamlining the design into a smaller system, with a bipod, grip, and optical sight that can transform the mechanism into a wieldable platform.Finally, replacing the marble with a softer cartridge much like a NERF round can make this system much more safer for a broader audience. Maybe Maybe it can be repurposed to into a kit that hobbyists and children can assemble to learn the mechanical concepts at play in a unique and fun manner!
...