Add machine zero positioning #12
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During initialization it's needed to have a fixed position. This will move it to X: 0 and Y: 0 during startup.
G28/G30 code should go machine zero (see [1]). So instead moving to the start location we go to machine zero. [1]: http://en.wikipedia.org/wiki/G-code
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Jan 20, 2015
Add machine zero positioning
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Since we have all the limit switches it's quite easy possible to move to a "machine zero".
We use X_MIN and Y_MIN limit switches to determine that.