Editing The Eggbot coordinate system
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A direct consequence of this relative nature of stepper motors is that the Eggbot has no idea what position the egg or pen arm is in when it begins a plot. Let's repeat that: the Eggbot has no idea where the pen or egg is when it begins a plot. At best, the Eggbot can track the cumulative number of forward (positive) and backwards (negative) steps each motor has taken since starting a plot [4]. Knowledge of the cumulative number of steps allows the Eggbot to return the pen to any previous position in the current plot, but that's all. The "Return to home" option is implemented this way: after finishing a plot, each stepper motor is stepped the opposite number of net steps that that motor took while drawing the plot. The final net travel for each motor then becomes zero steps. | A direct consequence of this relative nature of stepper motors is that the Eggbot has no idea what position the egg or pen arm is in when it begins a plot. Let's repeat that: the Eggbot has no idea where the pen or egg is when it begins a plot. At best, the Eggbot can track the cumulative number of forward (positive) and backwards (negative) steps each motor has taken since starting a plot [4]. Knowledge of the cumulative number of steps allows the Eggbot to return the pen to any previous position in the current plot, but that's all. The "Return to home" option is implemented this way: after finishing a plot, each stepper motor is stepped the opposite number of net steps that that motor took while drawing the plot. The final net travel for each motor then becomes zero steps. | ||
− | Another direct consequence of this relativity is that there is little if any utility to having absolute Eggbot coordinates. What's the use of an absolute position (0, 0) in Eggbot plotting space when the Eggbot has no idea what | + | Another direct consequence of this relativity is that there is little if any utility to having absolute Eggbot coordinates. What's the use of an absolute position (0, 0) in Eggbot plotting space when the Eggbot has no idea what asbolute position either stepper motor is in? Nonetheless, it sure would be nice to know where your drawing will land on your egg.... |
== Where does my drawing start? == | == Where does my drawing start? == |