USE AND MAINTENANCE MANUAL
2-Speed Gearboxes Series CE
M
.CE.GEN.ENG.DOCX
Issued
2018
Rev.03
Page 16 / 59
2.2
G
ENERAL OPERATING RULES
Planetary gearboxes can be used in the three positions described above.
Low speed mode
(chapter 2.2.2) can be used without time limitations, the gearbox can operate
continuously, provided all parameters are within the gearbox specifications.
During
high speed mode
operation (chapter 2.2.1), the motor torque is transmitted to the output shaft
through the planetary unit, though there is no relative speed in its components.
In fact, sun gear (12) and ring gear (10) turn at the same speed, so the planetary gears (7) have no
relative speed with reference to the sun gear and ring gear.
It means that the torque is transmitted by the same gears teeth, that might be stressed and result in
increased noise over time.
For all other operating specifications, please refer to chapter 5.3
In order prevent teeth damages and increased noise, it is mandatory to switch to low
speed mode for a few seconds every 1 hour of continuous operation in high speed mode,
whatever the speed is.
This will cause the planetary gears (7) to turn, changing the teeth that transmit torque
and allowing a proper lubrication too.
The gearboxes have an internal backlash that is necessary for all functions (mainly
shifting).
Under intermittent cut operations or certain working conditions, the structure of the
machine or spindle might resonate and the gearboxes might generate an abnormal
clanking noise.
If the gearboxes work fine without load or in different working conditions, the structure
and the kinematics of the machine itself should be investigated as well as the working
parameters (tooling and number of inserts, cutting speed and feed etc.).
Do not allow the gearboxes to operate in these conditions because it might be quickly
damaged!
