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tags/0.4.3-reflection
Wouter Horlings vor 4 Jahren
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To ensure that the design method resulted in a functional system, a prototype will be build from the current state of the design.
Although the development only implemented a very small portion of the full design, I determined that a prototype is more valuable than repeating the development cycle for the next feature.
Although the development resulted in only a partial design, I determined that a prototype is more valuable than repeating the development cycle for the next feature.
For the construction of the prototype \ac{ots}-parts are used as much as possible and the mechanical linkages of the SCARA will be printed.
To write characters on a whiteboard, drivers and controlloop have to be implemented in software.
To write characters on a whiteboard; drivers and controlloop are implemented in software.


\subsection{Construction}
The construction of the SCARA consists of a 3D printed mechanical structure that is actuated with stepper motors.
The type of stepper motor was already chosen during the development of the SCARA.
For the mechanical part I used OpenSCAD as CAD software, based on prior experience with the software.
As the inverse kinematics were already determined in basic model of the SCARA they could be easily parsed to the CAD software.
This allowed me to check for clearance between the mechanical parts, while repeating \autoref{test1}.
The test revealed that there was collision between some parts.
These collisions were resolved by adding a indentation and moving linkage and are shown in \autoref{fig:scad_clearance}
The configuration with the stepper motors, servo and marker is shown in \autoref{fig:scad_carriage}.
\begin{figure}
\centering
\includegraphics[width=0.8\linewidth]{graphics/scad_scara_circles.png}
\caption{CAD of the SCARA configuration, with the end-effector orientated in the lower left corner of the operating area.
The configuration has been adapted at the two circled points, to resolve collisions in this orientation.
An indentation was made to ensure that the arm could make the required corner.
Furthermore, the bottom linkage has been moved from above to below the actuated joints, as this linkage would otherwise collide with the end-effector.}
\label{fig:scad_clearance}
\end{figure}
\subsection{Mechanical Construction}

\begin{figure}
\centering
\includegraphics[width=0.8\linewidth]{graphics/scad_carriage.png}
\caption{Rendered 3D model of the SCARA, including steppers, marker and servo.}
\label{fig:scad_carriage}
\end{figure}

\subsection{Implementing Behavior}
Now with a physical SCARA, the last step is to implement the behavior.


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