4-1
4. Lubrication
Ball Screw
4.
Lubrication
It is necessary to use a good quality lubricant when using Ball Screws. Usage without lubrication
may increase wear on the rolling elements and shorten the service life.
A lubricant has the following effects.
(1) Minimizes friction in moving elements to prevent seizure and reduce wear.
(2) Forms an oil film on the raceway to decrease stress acting on the surface and extend rolling
fatigue life.
(3) Covers the metal surface in an oil film to prevent rust formation.
To optimize Ball Screw functions, provide lubrication appropriate to the usage conditions.
It is necessary to study the mounting positions of the grease nipple and piping joint according to
the installation direction.
(If the Ball Screw installation direction is other than horizontal use, the lubricant may not reach
the raceway completely. Be sure to let THK know the installation direction and the exact position
in each LM block where the grease nipple or the piping joint will be attached. See the general
catalog for the installation direction of the Ball Screw.)
Even with a Ball Screw with seals, the internal lubricant gradually seeps out during operation.
Therefore, the system needs to be lubricated at an appropriate interval according to the usage
conditions.
4-1
Lubrication Interval
4-1-1
Grease Lubrication
How often grease should be replenished varies depending on the usage conditions and
environment. We recommend greasing the system approximately every 100 km traveled (three
to six months). Final greasing interval/amount should be set at an actual machine.
Normally, relubricate using the same grease type and through the lubrication hole or grease
nipple provided on the Ball Screw. Mixing different types of grease may deteriorate the system’s
performance due to increased consistency or other such factor.
Lubricant
Type
Brand name
Grease
Lithium-Based Grease
Urea-Based Grease
Calcium-Based Grease
AFA Grease
(THK)
AFB-LF Grease (THK)
AFC Grease
(THK)
AFE-CA Grease (THK)
AFF Grease
(THK)
AFG Grease
(THK)
AFJ Grease
(THK)
L100 Grease
(THK)
L450 Grease
(THK)
L500 Grease
(THK)
L700 Grease
(THK)
Alvania Grease S No.2 (Showa Shell Sekiyu)
Eponex Grease No.2 (Idemitsu Kosan)
or equivalent
*The recommended grease will vary according to the usage conditions and environment.
www.thk.ru
тел. +7(499) 703-39-86
