The Easy Slide family of linear rails have a compact cross-section and low-friction movement.
Easy Slide’s range of cross-sectional rail sizes allow for applications in which high load capacities can be applied, combined with a very long service life.
This is achieved through producing the guide rails and sliders from cold-drawn bearing steel, the ball cage from steel and the balls from hardened bearing steel. The raceways of the guide rails and sliders are induction hardened. The system can be provided with anti-corrosion coating and stainless steel cages and balls.
Cost-effective
Robust
Suited for repeated, long life applications, the system features hardened raceways.
Horizontal applications only
Please note: For high acceleration/deceleration movement, cage creep may occur especially with long ball cage versions. Please see technical notes to minimise this.
Food, drink & pharmaceuticals
Food handling conveyors
pharmaceutical factories
stainless display equipment
Special purpose & packaging machines
Precision positioning systems handling units
robotic systems cutting machines
Logistics solutions
Container extensions
heavy duty extending systems
sliding doors
Construction
Seating
sliding panels
Transport (automotive)
Ambulance sliding systems
fire fighting vehicles
sliding panels
Transport (rail)
Seat adjustment
sliding doors
battery removal units
Medical technology
X-ray equipment
dental chairs
bed extensions
The telescopic slides have a standard electrolytic zinc plated coating (to ISO 2081). We offer a number of alternatives to increase the anti-corrosion protection including nickel plating.
However, our preferred and most eff ective solution to inhibit corrosion is to apply a special corrosion resistant (ATCoat) plating to the rails and sliders and to combine this with stainless steel ball bearings.
This coating is applied after the zinc plating process and is a special trivalent chromium passivation that is approximately 4 microns thick (and is free of Chromium VI). This applies a nano-particle coating and has extremely good results of 200 hours in salt spray tests before any signs of white rust.
Use with stainless steel fixing screws, strength class 10,9
The corrosion resistant alloy coating on the telescopic slides is a soft coating and will (over time) wear off the raceways (which are subject to loads from the ball bearings) – this can be seen sometimes by a thin line on the raceways. However lubricating the raceways with grease (as recommended) ensures, as far as possible, the good corrosion properties of the overall coating.
This coating is often re-applied to linear guides and telescopic pullouts in the food and chemical industries, where they can be exposed to corrosive or aggressive environments.
The ATCoat has received USDA approved and also EU approved No.1935/2004 for use in the food industry.
L1972 - This linear bearing consists of a guide rail and a slider that runs within the ball cage in the guide rail. High load capacities, compact cross-sections and simple and easy mounting characterise the series. Slider lengths can vary here as well and then form a total unit, which implements the required stroke.
L1972.MI - Variant with several sliders, which each runs in its own ball cage, independently of each other, in the guide rail. Slider length and stroke for each slider can be different within one rail.
L1972.MS - Several sliders run in a common ball cage within the guide rails. The slider lengths can vary here as well and then form a total unit, which implements the required stroke.
Rail Sizes h | Slider Length l2 | Width w | C0rad N | C0ax N | Mx Nm | My Nm | Mz Nm |
28 | 60 | 13 | 3480 | 2436 | 17,1 | 24 | 35 |
28 | 80 | 13 | 4640 | 3248 | 22,7 | 43 | 62 |
28 | 130 | 13 | 7540 | 5278 | 36,9 | 114 | 163 |
28 | 210 | 13 | 12180 | 8526 | 59,7 | 298 | 426 |
28 | 290 | 13 | 16820 | 11774 | 82,4 | 569 | 813 |
28 | 370 | 13 | 21460 | 15022 | 105,1 | 926 | 1323 |
28 | 450 | 13 | 26100 | 18270 | 127,9 | 1370 | 1958 |
Rail Sizes h | Slider Length l2 | Width w | C0rad N | C0ax N | Mx Nm | My Nm | Mz Nm |
35 | 130 | 17 | 9750 | 6825 | 47,2 | 148 | 211 |
35 | 210 | 17 | 15750 | 11025 | 76,3 | 386 | 551 |
35 | 290 | 17 | 21750 | 15225 | 105,3 | 736 | 1051 |
35 | 370 | 17 | 27750 | 19425 | 134,4 | 1198 | 1711 |
35 | 450 | 17 | 33750 | 23625 | 163,4 | 1772 | 2531 |
35 | 530 | 17 | 39750 | 27825 | 192,5 | 2458 | 3511 |
35 | 610 | 17 | 45750 | 32025 | 221,6 | 3256 | 4651 |
43 | 130 | 22 | 13910 | 9737 | 96,0 | 211 | 301 |
43 | 210 | 22 | 22470 | 15729 | 155,1 | 551 | 786 |
43 | 290 | 22 | 31030 | 21721 | 214,1 | 1050 | 1500 |
43 | 370 | 22 | 39590 | 27713 | 273,2 | 1709 | 2441 |
43 | 450 | 22 | 48150 | 33705 | 332,3 | 2528 | 3611 |
43 | 530 | 22 | 56710 | 39697 | 391,4 | 3507 | 5009 |
43 | 610 | 22 | 65270 | 45689 | 450,4 | 4645 | 6636 |
Technical Notes
Easy Slide with several independent slides in independant ball cages. The total load capacity is based on the number of slides in the rail and their length.
The length and stroke of the individual slides can be diff erent.
Tips
To ensure proper smooth movement, the stroke must be ≤ 7 x slider length.
For full rail sizing see individual product pages L1972.SN22, SN28, SN38, SN43, SN63.
Rail Length l1 = [ 2 x ( l3 + l2 ) + ( 2 x l8 )]
Technical Notes
Easy Slide with several independent slides in the same ball cage. The total load capacity is based on the number of slides in the rail and their length.
The length and stroke of the individual slides can be different.
Tips
To ensure proper smooth movement, the stroke must be ≤ 7 x slider length.
For full rail sizing see individual product pages L1972.SN22, SN28, SN38, SN43, SN63.
The maximum static loads of the L1972 series are defi ned by the slider lengths. These load capacities are valid for a loading point of forces and moments in the centre of the slider. The load capacities are independent of the position of the sliders inside the rails.
The radial load capacity, C0rad, axial load capacity, C0ax, and moments loads Mx, My and Mz indicate the maximum permissible values of the loads.
Higher loads adversely affect the running properties and the mechanical strength.
A safety factor, S0, is used to check the static load, which takes into account the basic parameters of the application.
Conditions | Safety factor S0 |
Neither shocks nor vibrations, smooth and low-frequency reverse; high assembly accuracy; no elastic deformations | 1,0 - 1,5 |
Normal installation conditions | 1,5 - 2,0 |
Shock and vibration, high-frequency reverse; significant elastic deformation | 2,0 - 3,5 |
The ratio of the actual load to maximum permissible load may be as large as the reciprocal of the accepted safety factor, S0, at most.
The formulae above apply for a single load case. If there are two or more of the described forces simultaneously, the following check must be made:
P0rad = effective radial load
C0rad = permissible radial load
P0ax = effective axial load
C0ax = permissible axial load
M1 = effective moment in the X-direction
Mx = permissible moment in the X-direction
M2 = effective moment in the Y-direction
My = permissible moment in the Y-direction
M3 = effective moment in the Z-direction
Mz = permissible moment in the Z-direction
For an off -centre load of the slider, the different load distribution on the balls must be accounted for with a reduction of the load capacity C. As shown, this reduction of the distance, d, from the loading point is dependent on the slider centre.
The value, q, is the position factor, the distance, d, is expressed in fractions of slider length S. The permissible load, P decreases as follows:
For a radial load
P = q . C0rad
For an axial load
P = q . C0ax
For the static load and the service life calculation, P0rad and P0ax must be replaced by the equivalent values calculated as follows, depending on whether the external load, P, acts:
Radially
Axially
The service life of a linear bearing depends on several factors, such as effective load, operating speed, installation precision, impacts and vibrations, operating temperature, ambient conditions and lubrication. The service life is defined as the time span between initial operation and the first fatigue or wear indications on the raceways.
In practice, the end of the service life must be defined as the time of bearing decommissioning due to its destruction or extreme wear of a component.
This is taken into account by an application coefficient, fi so the service life consists of:
Lkm = calculated service life (Km)
C0rad = load capacity (N)
W = equivalent load (N)
fi = application coefficient (see below)
Conditions | Application coefficient fi |
No impacts or vibrations, smooth and low-frequency direction change; clean operating conditions; low speeds (<0,5 m/s) | 1,0 - 1,5 |
Slight vibrations, average speeds (0,5 - 0,7 m/s) and average frequency of direction change | 1,5 - 2,0 |
Impacts and vibrations, high speeds (>0,7 m/s) and high-frequency direction change; very dirty environment | 2,0 - 3,5 |
If the external load, P, is the same as the dynamic load capacity, C0rad, (which of course must never be exceeded), the service life at ideal operating conditions (fi = 1) amounts to 100Km.
For a single load P, the following applies:
W = P
If several external loads occur simultaneously, the equivalent load is calculated as follows:
Clearance and Preload
The SN series linear bearings are installed with no clearance as standard. For more information please contact our Technical Department.
Increased clearance | No clearance | Increased preload |
G1 | Standard | K1 |
With correct lubrication and installation on level and rigid surfaces and sufficient parallelism for rail pairs, the friction value is less than or equal to 0,01. This value can vary depending on the installation situation.
With installation of the rails using all bolts on a perfectly plane support surface with the fixing holes in a straight line, the linear accuracy of the sliders to an external reference is as follows:
H = stroke
Speed
The linear bearings of the L1972 series can be used up to an operating speed of 0,8 m/s.
With high-frequency direction changes and the resulting high accelerations, as well as with long ball cages, there is a risk of cage creep (see instructions for use).
Temperature
The series can be used in ambient temperatures from -30°C to +170°C. A lithium lubricant for high operating temperatures is recommended for temperatures above +130°C.
Anti-corrosion protection
The L1972 series has a standard anti-corrosion protection (electrolytic zinc-plating to ISO 2081).
If increased anti-corrosion protection is required, the rails are available either with special coatings.
Numerous application-specifi c surface treatments are available upon request, e.g. as a nickel-plated design with FDA approval for use in the food industry. For more information, please contact our Technical Department.
Lubrication
Recommended lubrication intervals are heavily dependent upon the ambient conditions. Under normal conditions, lubrication is recommended after 100Km operational performance or after an operating period of 6 months.
In critical applications, the interval should be shorter. Please clean the raceways carefully before lubrication. Raceways and spaces of the ball cage are lubricated with a lithium lubricant of average consistency (roller bearing lubricant).
Different lubricants for special applications are available upon request, e.g. lubricant with FDA approval for use in the food industry.
For more information, please contact our Technical Department.
Cage creep
Under normal operating conditions, the cage moves in synchronisation with the carriage slider, but at half its speed; or to put it another way, the ball cage follows the relevant stroke, but travelling half the distance. In unfavourable operating conditions, e.g. fastchanging acceleration or heavy fluctuating strokes, it is not always possible to avoid cage slip from occurring. In this case, you should schedule a no-load stroke, if possible, in order to re-position the cage. If strokes fluctuate, you should also ensure adequate dimensioning of the drive that is used. You can use a friction coefficient of 0.1 for the relevant calculations.
Fixing screws
The rails of the SN series in sizes 22 to 43mm are fixed with countersunk head screws to DIN 7991.
Tightening torques of the standard fixing screws to be used
Rail sizes | Thread size | Property class | Tightening torque Nm |
22 | M4 | 10,9 | 4,3 |
28 | M5 | 10,9 | 8,5 |
35 | M6 | 10,9 | 14,6 |
43 | M8 | 10,9 | 34,7 |
Installation instructions
Internal stops are used to stop the unloaded slider and the ball cage, these are not designed to stop a moving, loaded slider. Please use external stops for a loaded system.
To achieve optimum running properties, high service life and rigidity, it is necessary to fix the linear bearings with all accessible holes onto a rigid and level surface.
Instructions for use
For linear bearings of the L1972 series, the sliders are guided through a ball cage inside the rails. When the sliders run their course relative to the rails, the ball cage moves along for half the slider stroke. The stroke ends as soon as the slider reaches the end of the cage.
Normally the cage moves synchronously to the balls at half the speed of the slider. Any cage slip negatively aff ects the synchronous movement of the ball cage, causing it to reach the internal stops prematurely, this reduces the stroke. The stroke value can be normalised at any time by moving the slider to the stop in the stopped cage. This moving of the slider relative to the cage will have increased resistance, which is dependent on the working load.
The causes of “cage slip” can be installation accuracy, dynamics, and load changes. The effects can be minimised by observing the following advice:
Parallelism errors or inaccuracies in the installation or in the mounting surfaces of mounted pairs can infl uence cage creep.
Series L1972 linear bearings should only be used for horizontal movement.
Alexia House
Glenmore Business Park
Portfield Works
Chichester, PO19 7BJ (UK)
Telephone 0333 207 4498
or + 44 (0) 1483 266 774
Email sales@automotioncomponents.co.uk
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