Additionally, to obtain high performance in measuring angular positions, most commercial encoders must be adapted to expensive antibacklash gear-reduction systems; even so, when gears wear out, they begin presenting small measurement errors.
A bipolar stepper motor is mounted on a solid structure after which an antibacklash gear-reduction system reduces the movement with a ratio of 311.85748 : 1.
The Z axes servos incorporate
antibacklash systems for positioning accuracies [l+ or -] 0.025 mm, the company says.
I was able to improve the responsiveness by adjusting the NexStar's
antibacklash feature (which jolts the declination motor at high speed for a moment whenever you switch guiding directions).
The LC router features ball screws and
antibacklash nuts on all three axes, offering smooth motion, a high level of accuracy and repeatability, and minimal maintenance needs.
The resulting compact package delivers the reliability of a stepper with the added precision and repeatability of an
antibacklash system at a low price.
Machine features a fixed working surface, with the grinding-wheel spindle fed to the workpiece on a precision-ground ballscrew with an
antibacklash double nut.