ZX-100K as replacement of PTFE
Description of the application
The threaded nut described here is used in the drive of cross tables (XY positioning system). The up-to-now used material was PTFE and its hub is 25 mm. The polished and hardened threaded rod (60 HRC) is driven from a step motor.
Fa = 30 N
n = 790 min -1
Stick-Slip-free, dry-running, highly accurate positioning and in addition, because of the machine is driven by a stepper motor, also a high damping were required.
A threaded nut TR 12 x 3 made of ZX-100K is used, which in comparison to the previously used PTFE is much shorter.
It reaches a minimum working life of 10 years.
Unlike a ball screw spindle, the pair trapezoidal threaded rod and the made of ZX-100K threaded nut, has got an excellent damping. The highest accuracy is achieved. Through a thin-wall zone, in which the threaded nut has got no thread, it can be easily preloaded, whereby a positioning accuracy of 1 micron can be achieved. The backlash (lost motion) is reduced to 0.