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Originally Posted by sciguy125
The thing is, encoders only tell you where the system is supposed to be, not where it is. A limit switch (or the like) will tell you when the system is at its limit and should stop. If you only have an encoder you know that you're supposed to be somewhere, but if you have a loose cable or chain, you'll actually be somewhere else.
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while this is true that they tell you in a theoretical world what your position is, if the system is decently designed and tested you should be abel to have them calibrated with little error. This is the reason for the calibration limit switch at the bottom, so each time you go to zero the calibration gets checked.