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Does it change the exact same amount each time? Or just close
OK, since I don't know your machine config I'm going to make some guesses. Homing usually works on a switch which gives you approximate position. Indicates you are within 1/2 pitch of the ballscrew of home. From that switch closure it moves, either way is possible depending on your software. When it senses the index pulse (one per rev) it sets home position. A couple of possibilities. The switch is dirty and that makes for uncertainty on when you start the home cycle. More likely is that you are missing the index pulse. Causes could be a weak battery for the encoder, bad connection or the chip logic which senses the index is bad. I'm guessing that the shift in the home position is n*pitch of the ballscrew. I like the idea of Li-mh if you can find the correct voltage but they charge different than the Ni-Cd's. Cleaning the switch with 'LPS' or other contact cleaner may help. HTH
Li-mh if you can find the correct voltage but they charge different than the Ni-Cd's.
OK, since I don't know your machine config I'm going to make some guesses. Homing usually works on a switch which gives you approximate position. Indicates you are within 1/2 pitch of the ballscrew of home. From that switch closure it moves, either way is possible depending on your software. When it senses the index pulse (one per rev) it sets home position. A couple of possibilities. The switch is dirty and that makes for uncertainty on when you start the home cycle. More likely is that you are missing the index pulse. Causes could be a weak battery for the encoder, bad connection or the chip logic which senses the index is bad. I'm guessing that the shift in the home position is n*pitch of the ballscrew. I like the idea of Li-mh if you can find the correct voltage but they charge different than the Ni-Cd's. Cleaning the switch with 'LPS' or other contact cleaner may help. HTH
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