Page 10 - Exlar - EXTRAK Modular rodless belt-driven actuators

Calculation Guidelines

Profile cross-sections LMB30/40/50

LMB30 with linear rail guiding LMB40 with linear rail guiding LMB50 with linear rail guiding
system and toothed belt drive system and toothed belt drive system and toothed belt drive

T-Slots and T-Nuts Calulation Guidelines
For all unit sizes the profiles, and often the The determination of service life must be If f S ≥ 1, the safety margin is sufficient
carriages as well, come with T-Slots. The calculated based on the specifications If f S ≤ 1, contact Exlar Applications
T-Slots of the linear actuator LMB40/50 are not of the linear guide system and the drive Engineering for further advice.
equipped with such. The attachment of those system.
two types is made through threaded holes. It is the linear guide or guide roller The formulas are applicable only in
The positions of the T-Slot as well as the system which normally determines the cases where all bearings are equally
maximum thread reach are shown in profile service life. Therefore the following loaded, i.e. the load F r F is applied at
cross-sections above. equations can be used for an the center of the carriage. Especially in
According to the T-Slot width, T-Nuts of the approximation of service life. vertical arrangements of the linear
types NS5, NS6 and NS8 are available. The actuator, the drive (screw or belt) must be
T-Nuts are available from Exlar. The order checked in addition to the guide capacity.
number must show type, material and thread Dynamic load
size (e.g. NS5 M5). The nominal service life L 10 is being Definition of the drive motor
The available types are shown below. calculated from the dynamic load factor Size and type of the drive motor
C dyn (N) and the applied load F r (N): primarily depend on the load, the
required displacement speed and the
) (10 m run)
L 10 = ( C dyn 3 5 acceleration factor. Calculation and
F r
choice of a positioning unit shall be
Static load based on the worst case service
conditions.
In cases where only static load is The linear actuator can be configured to
applied, the static load factor f S is
Grove Dimension Material Order accept any type of motor including
Width (mm) “a” (mm) Number calculated in order to show that an brushless motors, gearmotors, or Tritex
5 M5 Stainless Steel NS5 M 5 actuator with an adequate load capacity rotary actuators from Exlar.
6 M6 Stainless Steel NS6 M 6 has been selected. Taking into account
8 M8 Stainless Steel NS8 M 8 the static load factor The following formulas are provided for
sizing assistance.
C 0 (N) and the load F r (N) results:
Material
Dim “a” f s = Co
Sample: NS5 SS M5 F r

10 EXTRAK Rodless Actuators