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Vibration-damping levelling elements

SKU: 7954 Category:
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Technical Drawing

Product Details

Standard Elements Main dimensions Threaded stem Max load Max deflection Stiffness Weight
Code Description D D1 L L1 min L1 max l l1 d2 d s [N] [mm] [N/mm] g
415111 LW.A-80-M12x1.25×120 80 72 134 38 50 18.5 33 60 M12x1.25 7×7 5000 2 2500 530
415121 LW.A-120-M16x1.5×130 120 109 150 45 58 23 39 80 M16x1.5 9×9 10000 2.5 4000 1200
415131 LW.A-160-M20x1.5×170 160 150 192 55 70 29 47 130 M20x1.5 12×12 20000 2.2 9000 2650
415141 LW.A-200-M20x1.5×170 200 186 206 65 80 36 58 130 M20x1.5 12×12 40000 2.7 15000 4500

Additional information

Assembly instructions

– Put the base of the vibration-damping element under the machine and insert the stem through the hole (not tapped) in the frame of the machine (fig.1) <BR>- Turn the square end of the stem to take the levelling plate in contact with the machine thus obtaining the levelling required. Then lock with nut and washer (fig.2)


Zinc-plated steel.

Features and applications

ELESA vibration-damping levelling elements have been designed to damp vibrations, shocks and noises produced by moving bodies or non-balanced vibrating masses of equipment and machines which can cause: <BR>- malfunctioning and reduction of the machine lifespan and/or of the adjacent ones <BR>- damage at men’s health <BR>- noise.

Levelling plate

Zinc-plated steel.

Nut and washer

Zinc-plated steel.

Packing ring

OR in NBR synthetic rubber.

Technical data and guidelines for the choice

<strong>1) Basic data required:</strong> <br />
– disturbing frequency: the frequency of the disturbing vibration produced by a on-duty machine. In general, it coincides with the number of rotations of the engine [rpm] <br />
– the static load applied to every single vibration-damping element [N] <br />
– the isolation degree required [%] <br />
– damping disk deflection value [mm] under a given load <br />
– the stiffness, that is to say the load that applied to the vibration-damping element, produces a deflection of 1mm [N/mm]. <br />
<br />
<strong>2) How to choose the vibration-damping element:</strong> <br />
– with reference to the nomograph (Diagram), intersect the disturbing frequency value with the isolation degree required (each isolation degree corresponds to a line on the nomograph) and define the deflection (static deflection mm) <br />
– divide the load applied onto the vibration-damping element by the deflection value to obtain the required rigidity of the vibration-damping element <br />
– compare the rigidity obtained with the rigidity shown in the table and choose the vibration-damping element which presents the nearest value (lower) to the calculated one. <br />
<br />
<strong>3) Check the values obtained:</strong> <br />
– the deflection of the vibration-damping element chosen can be obtained in graphic 2 on the basis of the static load. <br />
– intersect the disturbing frequency value with the vibration-damping element deflection value in the nomograph (Diagram) to obtain the isolation degree offered by the vibration-damping element chosen. <br />
– compare the obtained value with the isolation degree required. <br />
<br />
<strong>4) Example:</strong> <br />
A 80% isolation degree is required. <br />
Conditions of use: <br />
– disturbing frequency = 3,000 rpm; <br />
– load applied to every levelling element = 4,000 N. <br />
– Diagram shows that with a 3,000 rpm disturbing frequency and an isolation degree of 80%, the deflection obtained is 0.6 mm. <br />
– Divide the load applied by the deflection obtained to define the rigidity required, which is 4,000/0.6= 6,666 N/mm. <br />
– Compare the rigidity value obtained (6,666 N/mm) with the values reported in the table. This value is within the rigidity value reported in the table for LW.A-120 (4,000 N/mm) and LW.A-160 (9,000 N/mm). Choose the vibration-damping element with the lower value that is LW.A-120. <br />
For a further check: <br />
– graphic 2 shows that LW.A-120 (4,000 N/mm) deflection is 1mm. <br />
– by intersecting the deflection value with the disturbing frequency of 3,000 rpm in the nomograph, the isolation degree obtained is 90%. <br />
This value is even greater than the required one; your choice has proved correct.

Threaded stem

Zinc-plated steel, supplied not assembled.

Vibration-damping disk

Natural rubber NR, hardness 80 Shore A, black colour, matte finish.

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