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LW.A

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)

Base

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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