For a single scissor link $i$ (where $i = 1, ..., 6$), the height $h_i$ is a function of the actuator stroke $d_i$ and the link length $L$: $$ h_i = 2L \sin(\theta_i) $$ where $\theta_i$ is the angle of the scissor arm relative to the horizontal. To position the end-effector at a desired position $(x, y, z)$, the controller must solve for the heights of all six scissors. Joya9tv1.com-balam Pichkari Part 1 -2025- S01 H... Apr 2026
This paper introduces the "Dunefeet Angel Manipulator," a novel robotic architecture characterized by a six-scissor mechanism (6 scissors) designed for high-payload manipulation in unstructured environments. Combining the structural stability of scissor lifts with the dexterity of a serial manipulator, this system addresses the limitations of traditional robotic arms in heavy-duty applications. The study details the geometric modeling, inverse kinematics, and singularity analysis of the six-scissor configuration. Simulation results demonstrate the manipulator's ability to maintain structural rigidity while achieving extended reach, validating its efficacy for industrial lifting and aerospace maintenance tasks. The demand for robotic systems capable of lifting heavy payloads while maintaining a high degree of maneuverability has driven recent innovations in mechanism design. Traditional serial manipulators, while dexterous, often suffer from low stiffness and payload capacity due to accumulated joint errors. Conversely, parallel manipulators offer high stiffness but restricted workspaces. --- Noorani Raatein Book In Roman English Pdf -2021- Instant
For a tilted orientation (pitch/roll) or lateral translation, the heights of the scissors vary. Assuming the scissors are arranged at 60-degree intervals around the central axis, the height of the $i$-th scissor required to achieve a platform normal vector $\vec{n} = [n_x, n_y, n_z]^T$ is given by: $$ h_i = z_{center} + R(n_x \cos(\phi_i) + n_y \sin(\phi_i)) $$ Where $\phi_i$ is the angular position of the $i$-th scissor and $R$ is the radius of the scissor placement circle.
Kinematic Analysis and Control Strategies for the ‘Dunefeet Angel Manipulator’: A Six-Scissor Architecture for High-Payload Mobility
For a simple vertical lift ($z$-axis only), all six scissors maintain equal height: $$ h_1 = h_2 = ... = h_6 = z $$