CSB-LMS® lead screw drives are manufactured in accordance with DIN 103. CSB-LMS® high-helix lead screws have high moving speeds been obtained at
low rotational speeds. CSB-LMS® high-helix lead screws has made this possible by using a high-helix pitch. CSB-LMS® lead screws are made of stainless
steel and are formed by the cold-rolling process. They are coupled with high wear-resistant material CSB-EPB13 nuts designs. For higher loads or special
applications, CSB-EPB5A may be used for the nuts.
Please note that the temperature also has an effect on the clearance of the nut, as well as the maximum load capacity. When the application is exposed to
particularly low or high temperatures, we recommend testing the suitability of the lead screw nuts in this specific case by a practical test.
Higher efficiency thread design
Due to a flatter thread angle in CSB-LMS® high- helix lead screws and nuts, the drive force is efficiently converted into a translational motion, Compared
with standard trapezoidal thread angle, this means a lower power loss. Due to the radius tooth design, The thread moving without lubrication, low noise and
Radial loads and torque
Radial loads or torque brought to bear upon the nut result in overload of individual contact surfaces, thus seriously affecting the service life of the lead screw
assembly. Therefore it is important to properly mount the screw and to comply with all relevant form and positional tolerances.
Required drive torque
The required drive torque of the threaded nut is obtained from the axial load, the lead screw pitch, the coefficient of surface friction of lead screw unit and the lead screw bearing. At high speeds, the acceleration torque must be taken into account, which may cause increased start torque depending on the installation. Dirt, dust and the surface or the condition of the lead screw can increase the drive torque. However, lubrication can temporarily reduce the required drive forces.
Levels of efficiency
Efficiency is the ratio between the output and input power rating. CSB-LMS® lead screw nuts are characterised by lowfriction values, resulting in high
Single start trapezoidal lead screw nuts achieve efficiencies between 20 and 48% under dry running conditions. High helix lead screw nuts achieve
efficiencies between 50 and 80% under dry running conditions. Even though CSB-LMS® lead screw nuts were developed for completely dry running
conditions, lubrication can help to additionally increase efficiency.
Critical rotational speed nper
Maximun outhorized load depending on speed
Driving torque M
Input performance P
Trapezoidal lead screw nuts from CSB-EPB13 must be used for applications in humid environments, especially for wet applications. These material are
characterised by very low moisture absorption.
Dirt with the use of the maintenance-free CSB-EPB® materials for lead screw nut production, CSB-LMS® lead screw drives feature completely dry-running
operation. Due to the deliberate avoidance of lubricants, the adhesion of soft particles such as dust and fibres is reduced. When compared to conventional,
lubricated materials, it is common to see significant improvements in the service life in contaminated environments. However, in environments with significant
contamination and hard particles, such as metal chips or granite dust, the lead screw should be covered.
Noise can generally occur with the use of lead screw drives. In particular, long lead screws and long travel distances can cause self-induced vibrations in
the systems. Due to their good sliding characteristics, lead screw nuts from the tribologically optimised CSB-EPB® materials tend to develop less noise than
conventional plastics or metallic materials, such as bronze or brass.
Lead screw nuts with flange
The maximum tightening torque for the assembly of flanged lead screw nuts is 2.5 Nm. We recommend that assembly screws are
secured with a semi permanent thread locking glue. Metallic ferrules should be used for even higher tightening torques.
Cylindrical lead screw nuts
The outer diameter of cylindrical lead screw nuts is designed for screw connection. We recommend that assembly screws are
secured with a semi permanent thread locking glue.