Vibration while moving can be a dirty tach.
The original EZTRAKs did not come with software for pitch error compensation. From about software version 3.02 you did have pitch error compensation.
Does it have a hard drive? Disk on chip? Disk on module? Or just a floppy?
At main screen, press the * key, enter the code 11235, press ENTER twice and you should see the parameters for travel, backlash, and pitch error.
You can also tune the drives, but I do not know how confortable you are with this.
George
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(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)
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