What is the means of DmN value and what is the range of it?
- Definition:
- Feed rate:shaft rotation x lead
- DmN value: (ball rotation speed)
Dm: ball pitch circle diameter(PCD)
N:rotational speed(rpm)

- For convenient, DN instead of DmN
General:DN ¢G 70,000
High DN value:DN 3 100,000

High DN value:based on shaft rotation speed and lead to promote feeding rate.
It will consider problems caused by high speed condition such as accuracy,
load, critical speed, service life, ball recirculation structure, and temperature rise.