Schaeffler Product catalogue - medias
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Linear tables with open shaft guidance system
Features
 

Linear tables LTS are suitable for moderate loads and long stroke lengths.

 
 

Linear tables LTS have higher load capacity in the compressive direction, due to the supported guidance shafts, than for example linear tables LTE with open shaft guidance system.

 
   

Basic design

 

The basic design of linear tables LTS has no drive and comprises:

 
 
  • a carriage unit made from aluminium alloy with four linear ball bearings KBO lubricated via two lubrication nipples on each side of the carriage unit
  • two shaft and support rail units. The shaft and support rail units are composite units comprising an aluminium support rail and a shaft made from quenched and tempered steel to rolling bearing quality. The shafts are hardened and ground
  • bellows fitted as optional..
 
 

The linear ball bearings have an initial greasing, are sealed and can be relubricated.

 
   

With trapezoidal screw drive

 

Linear tables LTS with trapezoidal screw drive comprise the basic design plus the following additional components:

 
 
  • a rolled trapezoidal screw spindle with a cylindrical bronze nut
  • on the drive side: a locating bearing in a shaft support block; depending on the table size, the locating bearing comprises one double row angular contact ball bearing or two single row angular contact ball bearings
  • on the opposite side: a non-locating bearing in a shaft support block; the non-locating bearing comprises one single row ball bearing..
 
 

The spindle support bearings are sealed and lubricated for life. The spindle nut has an initial greasing, is sealed and can be relubricated via a lubrication nipple in the carriage unit.

 
   

With ball screw drive

 

Linear tables LTS with ball screw drive comprise the basic design plus the following additional components:

 
 
  • a rolled ball screw spindle with a cylindrical single nut M. In the case of some pitch values, preloaded double nuts MM are also possible
  • on the drive side: a locating bearing in a shaft support block; the locating bearing comprises a preloaded double row angular contact ball bearing ZKLN and a lubrication nipple
  • on the opposite side: a non-locating bearing in a shaft support block; the non-locating bearing comprises a needle roller bearing NA and a lubrication nipple..
 
 

The spindle support bearings and spindle nuts have an initial greasing, are sealed and can be relubricated. The spindle nuts can be relubricated via a lubrication nipple in the carriage unit.

 
   

With bellows

 

Linear tables LTS can be equipped with two sets of bellows, excluding LTS12.

 
 

The bellows are attached by means of Velcro tape.

 
 

For the same stroke length, the total length of a linear table with bellows is greater than the total length of a linear table without bellows.

 
   

Screw drive

 

The spindle thread has a pitch value of between 3 mm and 50 mm, see table. As standard, single nuts with an axial clearance dependent on the pitch are used. In the case of some pitch values, the ball screw drive can be supplied with preloaded double nuts.

 
   
Table 1
Screw drive variants
 

Screw drive variants
Trapezoidal screw drive
Ball
screw drive
Suffix
Pitch
3
mm

- 3
4
mm


4
5
mm


5
6
mm

- 6
8
mm

- 8
10
mm


10
20
mm
-
20
40
mm
-
40
50
mm
-
50
Single nut (cylindrical)


M
Double nut (cylindrical)
-
MM
Without drive (no spindle),
with bellows
- - OA

 
   

Drive elements

 

For linear tables, Schaeffler also supplies components such as couplings, coupling housings, servo motors and servo controllers, ➤ Figure 1. The range is supplemented by servo controllers for effective drive and control of the motors.

 
   

Figure 1
Linear table
with open shaft guidance system

Example:
LTS
Medias/00016410_mei_in_0k_0k.gif Carriage unit
Medias/00016411_mei_in_0k_0k.gif Coupling KUP
Medias/00016412_mei_in_0k_0k.gif Coupling housing KGEH
Medias/00016413_mei_in_0k_0k.gif Servo motor MOT

 

imageref_7629303947

 
   

Proven drive combinations

 

The combination of the necessary drive components for vertical and horizontal applications as a function of the mass to be moved, the acceleration and the travel velocity of carriage units is shown on link.

 
   
achtung  

The bearing load in the linear tables must be checked; it is not taken into consideration in dimensioning of the motor. For vertical mounting, motors with a holding brake must be used.

 
 

If different loading and kinematic criteria apply, the least favourable operating conditions should be used for calculation of the drive motor and design of the gearbox, coupling and servo controller.

 
   

Special designs

 

Special designs are available by agreement. Examples of these are linear tables LTS with

 
 
  • guidance shafts and spindles with anti-corrosion protection
  • bellows resistant to welding beads
  • a rolled ball screw spindle to accuracy class 25 μm per 300 mm
  • a trapezoidal screw drive with a left hand thread
  • special table designs according to customer requirements..
 
   
  
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