TCG roller pinion. Backlash does not occur in the forward and reverse directions because the teeth (roller pins) are always in contact at 2-3 places. Its feeding accuracy (rotation straight line ratio) and positioning accuracy are close to those of precision ball screws. Also, the rollers are supported by bearings that roll smoothly on the trochoid gear. It does not produce a loud gear rattle or traveling noise. Therefore, there is less vibration.
