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@@ -2,7 +2,7 @@ |
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As the previous development cycle was aborted prematurely, the development cycle is repeated for the next feature. |
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\subsection{Feature Selection} |
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The implementation of the end-effector proofed to be impractical. |
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The implementation of the end-effector proved to be impractical. |
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This means that only two features are left. |
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\autoref{tab:featurestab2} shows an updated feature comparison. |
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Compared with the previous feature selection in \autoref{tab:firstfeatureselection}, the number of tests for the SCARA decreased and the Risk/Time increased. |
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@@ -77,7 +77,7 @@ |
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It consists of the forward and inverse kinematics of the design. |
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With this kinematics model it was easy to find a good configuration of the SCARA. |
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I tested if the SCARA could reach the required operating area, to be able to satisfy specification \ref{threecharspec}. |
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The operating area is not a couple of centimeters away from the base of the SCARA. |
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The operating area is a couple of centimeters away from the base of the SCARA. |
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This is to avoid the singularity point that lies at the base of the SCARA. |
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Resulting in longer arms than strictly necessary but this reduces the operating angles of the joints allowing for simpler construction. |
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@@ -131,9 +131,9 @@ |
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Due to the aborted implementation of the end-effector, the SCARA must also lift the marker of the board. |
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The chosen configuration of the SCARA makes it possible to add an extra joint in the linkage. |
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As the marker only needs to be moved a couple of millimeters from the board, a simple servo suffices. |
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As the marker only needs to be moved a couple of millimeters from the board, a simple hobby servo suffices. |
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\subsubsection{Implementing details} |
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\subsubsection{Advanced Detail Design} |
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The new concrete design decisions, make it possible to plan the next steps of adding detail. |
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The following steps are an addition to the steps as described in the previous section: |
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\begin{enumerate} |
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@@ -186,7 +186,9 @@ |
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\subsubsection{Evaluation} |
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The complete development was rather smooth. |
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However, this was not without deviating from the original design plan. |
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The different levels of detail could not be defined before the start of the development but had to be updated midway. |
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It was not feasible to define all different levels of detail before the start of the development. |
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Prior to the design, it was possible to plan 4 levels of detail. |
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After these steps, the design decisions taken made it possible to define the following levels of detail. |
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In total there are seven predefined levels of detail in the design. |
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Meaning that there must also be seven test cycles. |
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