lts linear tables with open shaft guide

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.

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. The range is supplemented by servo controllers for effective drive and control of the motors.

Linear table
with open shaft guidance system

Example: · LTS ·

Carriage unit ·

Coupling KUP ·

Coupling housing KGEH ·

Servo motor MOT

Proven drive combinations

For vertical and horizontal applications, the necessary drive components can be combined as a function of the mass to be moved, the acceleration and the travel velocity of the carriages.

ATTENTION

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.

Design and safety guidelines

The information on design and safety guidelines for linear tables LTS substantially matches the information on design and safety guidelines for linear tables LTE. The following pages describe exclusively the differences between the linear tables LTS and the linear tables LTE.

Main load direction of linear tables with linear ball bearings

The effective load rating of a linear ball bearing is dependent on the position of the load direction in relation to the position of the ball rows.

In the case of linear tables LTS, the linear ball bearings are fitted in a specific alignment. As a result, the basic load rating relating to the mounting position of the linear ball bearing is specifically defined, ➤ Figure.

Main load direction

LTS

Deflection

The deflection of linear tables LTS is essentially dependent on the adjacent construction. It is not therefore possible to provide data or diagrams for the deflection.

Length calculation
of linear tables

The length calculation of linear tables is based on the required effective stroke length N_H. The effective stroke length N_H must be increased by the addition of safety spacing values on both sides of the travel distance. It is only if bellows are present that the effective length B_L must be added.

The total length L_tot of the linear table is determined from the effective stroke length N_H, the safety spacings S, the carriage unit length L and the lengths of the end plates L₄ and L₅.

Parameters required for length calculation

G_H	mm	Total stroke length
N_H	mm	Effective stroke length
S	mm	Safety spacing, see table
L	mm	Length of carriage plate
L_tot	mm	Total length of linear table
L₄	mm	Length of end plate
L₅	mm	Length of end plate
L₂₀	mm	Screw head of end plate
L₂₁	mm	Thickness of end plate
F_BL		Effective length factor according to linear table type
B_L	mm	Effective length of bellows
B_B	mm	Length of bellows fastener.

Total stroke length G_H

The total stroke length G_H is determined from the required effective stroke length effective stroke length N_H and the safety spacings S, which must correspond to at least the spindle pitch P.

Maximum lengths of linear tables

The maximum length of linear tables LTS without bellows is dependent on the size, the drive type and the maximum length of the bellows, see table.

ATTENTION

In the case of a total length L_tot ＜ 2 · L + 30, not all fixing holes in the support rail will be accessible, so please consult us.

Maximum lengths without bellows

Designation	L_tot	Designation	L_tot	Designation	L_tot
Designation	mm	Designation	mm	Designation	mm
LTS12	6 000	‒	‒	‒	‒
LTS16	6 000	LTS16..-TR	2 900	LTS16..-KGT	2 900
LTS20	6 000	LTS20..-TR	2 900	LTS20..-KGT	5 850
LTS25	6 000	LTS25..-TR	2 900	LTS25..-KGT	5 850
LTS30	6 000	LTS30..-TR	2 900	LTS30..-KGT	5 850
LTS40	6 000	LTS40..-TR	2 900	LTS40..-KGT	5 850
LTS50	6 000	LTS50..-TR	2 900	LTS50..-KGT	5 850

Maximum lengths with bellows

Designation	L_tot	Designation	L_tot	Designation	L_tot
Designation	mm	Designation	mm	Designation	mm
LTS12	‒	‒	‒	‒	‒
LTS16	3 000	LTS16..-TR	2 900	LTS16..-KGT	2 900
LTS20	3 800	LTS20..-TR	2 900	LTS20..-KGT	3 800
LTS25	4 400	LTS25..-TR	2 900	LTS25..-KGT	4 400
LTS30	5 400	LTS30..-TR	2 900	LTS30..-KGT	5 400
LTS40	6 000	LTS40..-TR	2 900	LTS40..-KGT	5 600
LTS50	6 000	LTS50..-TR	2 900	LTS50..-KGT	5 600

Total length L_tot

The following ➤ equtions are designed for one linear table. The parameters and their position can be found in ➤ Figure and ➤ Figure as well as in the table.

Length parameters for linear tables without drive

Linear table without bellows
LTS..-OA

Linear table with bellows
LTS..-OA

Length parameters for linear tables with trapezoidal or ball screw drive

Linear table without bellows
LTS..-TR, LTS..-KGT

Linear table with bellows
LTS..-TR, LTS..-KGT

Length parameters

Designation	L	L₄	L₂₀	L₂₁	L₅	S	F_BL	B_B
Designation	mm	mm	mm	mm	mm	mm	F_BL	mm
LTS12-85	85	‒	‒	‒	‒	Dependent on application	‒	‒
LTS16-100	100	3,3	4	1,58	29
LTS20-130	130			1,43	29
LTS25-160	160			1,34	29
LTS30-180	180			1,26	29
LTS40-230	230			1,27	30
LTS50-280	280			1,22	30
LTS16-100-TR12×3	100	24	‒	‒	18	3	1,58	21
LTS20-130-TR16×4	130	29	20	4	1,43	21
LTS25-160-TR16×4	160	33	25	4	1,34	21
LTS30-180-TR20×4	180	38	25	4	1,26	21
LTS30-180-TR20×8	180	38	25	8	1,26	21
LTS40-230-TR24×5	230	39	30	5	1,27	22
LTS40-230-TR24×10	230	39	30	10	1,27	22
LTS50-280-TR32×6	280	42	30	6	1,22	22
LTS16-100-1204	100	24	18	4	1,58	21
LTS16-100-1205	100	24	18	5	1,58	21
LTS20-130-1605	130	29	20	5	1,43	21
LTS20-130-1610	130	29	20	10	1,43	21
LTS25-160-1605	160	33	25	5	1,34	21
LTS25-160-1610	160	33	25	10	1,34	21
LTS30-180-2005	180	38	25	5	1,26	21
LTS30-180-2010	180	38	25	10	1,26	21
LTS30-180-2020	180	38	25	20	1,26	21
LTS30-180-2050	180	38	25	50	1,26	21
LTS40-230-2505	230	39	30	5	1,27	22
LTS40-230-3210	230	42	30	10	1,27	22
LTS40-230-3220	230	42	30	20	1,27	22
LTS40-230-3240	230	42	30	40	1,27	22
LTS50-280-2505	280	39	30	05	1,22	22
LTS50-280-3210	280	42	30	10	1,22	22
LTS50-280-3220	280	42	30	20	1,22	22
LTS50-280-3240	280	42	30	40	1,22	22

Effective length of bellows

The effective length of bellows is the length occupied by the bellows in the fully compressed state. Calculation is based on the total stroke length G_H, ➤ Figure, ➤ equation and table.

Effective length calculation

Carriage unit against the right end stop ·

Carriage unit against the left end stop

B_L	mm	Effective length of bellows
G_H	mm	Total stroke length
F_BL	–	Effective length factor according to linear table type, see table
B_B	mm	Length of bellows fastener.

Calculation of hole pattern of shaft and support rail units

Shaft and support rail units are supplied as standard with a symmetrical hole pattern. If a symmetrical hole pattern is present: a_R = a_L. In the following calculation, the values must not be less than the value a_R min (a_L min).

Parameters for hole pattern calculation

a_R, a_L	mm	Spacing on right and left between end of shaft and nearest hole centre point a_R min = a_L min = 20 mm for linear tables without bellows a_R min = a_L min = 24 mm for linear tables with bellows
j_L8	mm	Hole spacing
L_tot	mm	Total length of table
n		Number of hole pitches.

Hole pattern, without drive

The number of hole pitches n is the whole number equivalent to:

The spacing a_L between the end of the shaft and support rail units and the nearest hole centre point is calculated as follows:

Spacings a_R and a_L on shaft and support rail units

Hole pattern, with drive

The number of hole pitches n is the whole number equivalent to:

The spacing a_R and a_L between the end piece and the nearest hole centre point is calculated as follows:

Spacings a_R and a_L on shaft and support rail units

ATTENTION

In the case of a total length L₂ ＜ 2 · L + 30, not all fixing holes in the support rail will be accessible, so please consult us.

Mass calculation

The total mass of a linear table is calculated from the mass of the table without a carriage unit and the carriage unit.

Values for mass calculation, linear table without drive

Designation	Mass
	Carriage unit	Table without carriage unit
	m_LAW	m_BOL
	≈kg	≈kg
LTS12	0,5	L_tot · 0,003 2 + 0,5
LTS16	0,8	L_tot · 0,005 0 + 0,1
LTS20	1,6	L_tot · 0,007 6 + 0,14
LTS25	3	L_tot · 0,010 6 + 0,21
LTS30	4,4	L_tot · 0,015 0 + 0,27
LTS40	9,1	L_tot · 0,024 8 + 0,42
LTS50	16,1	L_tot · 0,037 8 + 0,62

Values for mass calculation, linear table with screw drive

Designation	Mass
	Carriage unit^**	Table without carriage unit
	m_LAW	m_BOL
	≈kg	≈kg
LTS16..-12	0,8	L_tot · 0,005 8 + 0,46
LTS20..-16	1,6	L_tot · 0,008 9 + 0,94
LTS25..-16	2,9	L_tot · 0,011 9 + 1,54
LTS30..-20	4,3	L_tot · 0,017 1 + 2,07
LTS40..-25	8,8	L_tot · 0,028 1 + 3,46
LTS40..-32	9,2	L_tot · 0,030 5 + 3,64
LTS50..-25	15,8	L_tot · 0,041 1 + 4,94
LTS50..-32	16,3	L_tot · 0,043 5 + 5,16

^**Including single or preloaded double nut.

Lubrication

The information on the lubrication of LTS matches the information on the lubrication of LTE. The only differences are in the relubrication quantities and relubrication points.

Relubrication

Relubrication should be carried out wherever possible with several partial quantities at various times instead of the complete quantity at the time of the relubrication interval. Relubrication quantities, see table. The locating and non-locating bearing in the trapezoidal screw drive are lubricated for life.

Relubrication quantities per lubrication nipple

Designation	Linear ball bearing	d₀	P	Trapezoidal screw drive			Ball screw drive
	Linear ball bearing	d₀	P	Threaded nut	Locating bearing	Non-locating bearing	Threaded nut	Locating bearing	Non-locating bearing
	≈g	mm	mm	≈g	Locating bearing		≈g	Locating bearing	Non-locating bearing
LTS12	0,2	‒	‒	‒	‒	‒	‒	‒	‒
LTS16	0,3	12	3	‒	Lubricated for life		‒	Lubricated for life^**
LTS16	0,3	12	4	‒			0,2
LTS20	0,4	16	4	3,5			‒
			5	‒			0,5
			10	‒			1,3
LTS25	1,1	16	4	3,5			‒
			5	‒			0,5
			10	‒			1,3
LTS30	1,3	20	4	6			‒
			5	‒			0,6
			10	‒			3,1
			20	‒			3
			50	‒			8,6
LTS40	2,5	24	5	10			‒
		25	5	‒			0,8
		32	10	‒			3,1
			20	‒			6,8
			40	‒			9,5
LTS50	5,5	25	5	‒			0,8
		32	6	15			‒
			10	‒			3,1
			20	‒			6,8
			40	‒			9,5

^**If relubrication is required due to the application, please consult us.

Relubrication points

The linear ball bearings are greased in pairs in each case via a lateral lubrication nipple in the carriage unit. The spindle nuts are supplied with lubricant via a separate lubrication nipple. The spindle bearing arrangement of the ball screw drive in the shaft support blocks is supplied in each case from above via a lubrication nipple, see ➤ Figure, table, ➤ Figure, and ➤ Figure.

Lubrication points on linear table

LTS

Relubrication point for locating bearing ·

Relubrication point for non-locating bearing ·

Lubrication points for linear ball bearings ·

Relubrication point for spindle nut

ATTENTION

During lubrication of actuators, all lubrication points on one longitudinal side of a carriage unit must always be provided with lubricant.

Position of relubrication points

Designation	Mounting dimensions
	Type NIP	Without drive		With screw drive
		2×for linear ball bearings		1×for spindle nut		2×for linear ball bearings		Locating bearing		Non-locating bearing
		h₅₆	l₅₆	h₅₆	l₅₆	h₅₇	l₅₇	b₇₇	l₇₇	b₇₈	l₇₈
		mm	mm	mm	mm	mm	mm	mm	mm	mm	mm
LTS12	A1	10	16	‒
LTS16		14	18	5,5	40	14	18	9,5	10,5	9	9
LTS20		15	22,5	5	53,15	15	22,5	12	10	‒	10
LTS25	A2	15	29	6	53,15	20	29	10	16	‒	12,5
LTS30		20	34	6	56,4^**	20	34	14	14,5	‒	12,5
LTS40		30	40	8	56,4^**	30	40	13^**	17^**	‒	15
LTS50	A3	40	50	10	56,4^**	40	50	‒	17^**	‒	15

^**In the case of a spindle 2020 and 2050, l₅₆ = 52 mm.

^**In the case of a spindle 3210 and 3220, l₅₆ = 86 mm.
In the case of a spindle 3240, l₅₆ = 69 mm.

^**In the case of a spindle size 25, b₇₇ = 0 mm.

^**In the case of a spindle size 25, l₇₇ = 15,5 mm.

Lubrication points

LTS
without drive

Position of relubrication points

LTS
with drive

Maximum permissible spindle speed

Screw drives must not be allowed to run in the critical speed range.

The critical speed is essentially dependent on the following factors:

spindle length

spindle diameter

spindle bearing arrangement

mounting method.

The carriage unit travel velocity is calculated as follows:

v	m/s	Carriage unit velocity
n	min^–1	Spindle speed
P	mm	Spindle pitch.

The carriage unit velocity v is determined from the spindle speed n and the spindle pitch P. Note the factors influencing the carriage unit velocity, such as maximum values.

Diagram

The diagram shows the relationship for individual series and sizes between the critical speed and the spindle length, ➤ Figure. The diagram takes account of the effective length B_L of the bellows cover. Definition of the effective length, see link.

Maximum permissible spindle speed without spindle supports

LTS16 · LTS20 · LTS25 · LTS30 · LTS40 · LTS50

n_max = maximum speed · n = spindle speed · L₂ = length of shaft and support rail unit

Mounting requirements

The information on the mounting position and mounting arrangement of LTS matches the information on the mounting position and mounting arrangement of LTE. At this point, only deviating or additional information will be covered.

Overlong tables

In the case of very long linear tables LTS, one support rail must first be aligned by means of the shaft and screw mounted in stages. The support rail arranged in parallel is aligned by moving the carriage, thus ensuring the centre spacing of the support rail. In the case of parallel support rails, the linear table must be located by an additional form fit on the adjacent construction. The datum support rail should be clamped against a stop, ➤ Figure.

Alignment of a shaft and support rail unit by means of the shaft

Shaft and support rail unit

Accuracy

Length tolerances

The length tolerances for linear tables can be taken from ➤ Figure and the table.

Length tolerances

L₂ = length of shaft and support rail unit · L_tot = total length

Tolerances

Total length L_tot of linear tables LTS				Tolerance
mm				mm
		L_tot ＜	400	±0,5
400	≦	L_tot ＜	1 000	±0,8
1 000	≦	L_tot ＜	2 000	±1,2
2 000	≦	L_tot ＜	4 000	±2
4 000	≦	L_tot ＜	5 850	±3

Accuracy of the screw drive

Linear tables with trapezoidal screw drive are only available with a single nut with clearance, see table. The pitch accuracy is dependent on the size, see table.

Linear tables with ball screw drive are available with a single nut with clearance, see table. Where higher accuracy requirements are present, preloaded (clearance-free) double nuts are possible for many pitch values, see table.

ATTENTION

In the case of standard linear tables with ball screw drive, the nut unit (double nut) can only be preloaded clearance-free if the spindle pitch P is less than the nominal diameter d₀ of the spindle.

Trapezoidal screw drive

Designation	Spindle			Spindle nut
	Nominal diameter	Pitch		Single nut
	d₀	P	Accuracy	Suffix	Axial clearance
	mm	mm	μm each 300 mm		mm
LTS16	12	3	300	M	0,4	to	0,5
LTS20	16	4	50
LTS25	16	4	50
LTS30	20	4	50
LTS30	20	8	200
LTS40	24	5	50
LTS40	24	10	200
LTS50	32	6	50

Ball screw drive

Designation	Spindle			Spindle nut
	⌀ d₀	P	Pitch accuracy	Single nut		Double nut
	⌀ d₀	P	Pitch accuracy	Suffix	Axial clearance	Suffix	Axial clearance
	mm	mm	μm each 300 mm	Suffix	mm	Suffix	Axial clearance
LTS16	12	4	50	M	0,05	‒	‒
LTS20	16	5	50	M	0,05	MM	Preloaded
LTS20	16	10	50	M	0,05	‒	‒
LTS25	16	5	50	M	0,05	MM	Preloaded
LTS25	16	10	50	M	0,05	MM	Preloaded
LTS30	20	5	50	M	0,05	MM	Preloaded
		10				MM	Preloaded
		20				‒	‒
		50
LTS40	25	5	50	M	0,05	MM	Preloaded
	32	10
		20
		50				‒	‒
LTS50	25	5	50	M	0,05	MM	Preloaded
	32	10
		20
		50				‒	‒

Linear tables with open shaft guidance system

Features

Basic design

With trapezoidal screw drive

With ball screw drive

With bellows

Screw drive

Screw drive variants

Drive elements

Linear tablewith open shaft guidance system

Proven drive combinations

ATTENTION

Special designs

Design and safety guidelines

Main load direction of linear tables with linear ball bearings

Main load direction

Deflection

Length calculationof linear tables

Total stroke length GH

Maximum lengths of linear tables

ATTENTION

Maximum lengths without bellows

Maximum lengths with bellows

Total length Ltot

Length parameters for linear tables without drive

Linear table without bellowsLTS..-OA

Linear table with bellowsLTS..-OA

Length parameters for linear tables with trapezoidal or ball screw drive

Linear table without bellowsLTS..-TR, LTS..-KGT

Linear table with bellowsLTS..-TR, LTS..-KGT

Length parameters

Effective length of bellows

Effective length calculation

Calculation of hole pattern of shaft and support rail units

Hole pattern, without drive

Spacings aR and aL on shaft and support rail units

Hole pattern, with drive

Spacings aR and aL on shaft and support rail units

ATTENTION

Mass calculation

Values for mass calculation, linear table without drive

Values for mass calculation, linear table with screw drive

Lubrication

Relubrication

Relubrication quantities per lubrication nipple

Relubrication points

Lubrication points on linear table

ATTENTION

Position of relubrication points

Lubrication points

Position of relubrication points

Maximum permissible spindle speed

Diagram

Maximum permissible spindle speed without spindle supports

Mounting requirements

Overlong tables

Alignment of a shaft and support rail unit by means of the shaft

Accuracy

Length tolerances

Length tolerances

Tolerances

Accuracy of the screw drive

ATTENTION

Trapezoidal screw drive

Ball screw drive

Linear table
with open shaft guidance system

Length calculation
of linear tables

Total stroke length G_H

Total length L_tot

Linear table without bellows
LTS..-OA

Linear table with bellows
LTS..-OA

Linear table without bellows
LTS..-TR, LTS..-KGT

Linear table with bellows
LTS..-TR, LTS..-KGT

Spacings a_R and a_L on shaft and support rail units

Spacings a_R and a_L on shaft and support rail units