EN 248 Vibration Damping Leveling Feet Steel, Fixed Threaded Stud Type, with Rubber Pad

Photo

ELESA original design
code: LW.A.

Product description

Information

EN 248 leveling feet with damping pad made of natural rubber absorb vibrations and shocks, thus increasing the lifetime of machines and reducing noise pollution.

Using the details on the maximum static load F, the maximum permissible compression and the resulting stiffness, the achievable degree of insulation of the vibration can be determined with the help of the method shown on the page "Determining the Suitable Levelling Foot".

The information about load bearing capacity are non-binding guide values and rule out any liability. They constitute no general warranty of quality and condition. The user must determine from case to case whether a product is suitable for the intended use.

Specification

Reinforcing plate / stud head / support plate
Steel, zinc plated, blue passivated finish

Threaded stud
Steel
  • Property class 5.8
  • Zinc plated, blue passivated finish

Vibration damping pad
Natural rubber (NR)
  • 80 shore A
  • Black

Hex nut ISO 4032
Steel, zinc plated


RoHS compliant

Technical drawing

3D
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EN 248 Steel Vibration Damping Leveling Feet, Fixed Threaded Stud Type, with Rubber Pad sketch

Part Options / Table

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Metric

Dimensions in: Inch | Metric
d1d2
Thread
l1d3d4l2
min.

max.
l3l4s
Square
Static loadStiffness RMax. compression
3.15M 12 x 1.255.282.362.831.501.971.380.390.281124 lbf (5000 N)14276 lbf/in (2500 N/mm)0.08
4.72M 16 x 1.55.913.154.291.772.281.610.390.352248 lbf (10000 N)22842 lbf/in (4000 N/mm)0.10
6.30M 20 x 1.57.563.945.912.172.761.890.390.474496 lbf (20000 N)51395 lbf/in (9000 N/mm)0.09
7.87M 20 x 1.58.115.127.322.563.152.360.390.478992 lbf (40000 N)85658 lbf/in (15000 N/mm)0.11

Build & Price

3D Product Configurator
Diameter d1
Thread d2
Length l1

Degree of Insulation Chart

Diagramme Isolation grade

Interference frequency [Hz]:
Is the frequency emanating from a machine,
e.g. from the machine main shaft speed [rpm].

Static load F [lbf or N]:
Is the load acting on each vibration damping pad (leveling foot).

Degree of insulation [%]:
Is the measure for absorbing the interference frequency (damping)

Compression s [in or mm]:
Is the change in the height of the damping pad (spring rate).

Stiffness R [lbf/in or N/mm]:
Is the load that causes the damping pad to be compressed by 1 in / 1 mm (spring rate)

Determining the Suitable Leveling Foot and the Achievable Degree of Insulation

The first step is to determine the static load F per leveling foot. With appropriately arranged leveling feet and thus an evenly distributed load F, this value is calculated using the following equation:


Force due to weight of the machine [lbf or N] / Number of leveling feet

= Static load F [lbf or N] per leveling foot


Use the calculated static load F to select a leveling foot from the table, making sure that the static load F lies as close as possible to the static load capacity without exceeding it. The associated stiffness R of the selected leveling foot is also taken from the table.
The actual compression is then calculated using the equation below:


Static load F [lbf or N] per leveling foot /
Stiffness R [lbf/in or N/mm]

= Actual compression s [in or mm]

Starting from the calculated actual compression s, the achievable degree of insulation as factor of the interference frequency can now be taken from the chart shown above. To optimize the achievable degree of insulation, the number of leveling feet may be changed such that the static load F for each leveling foot is as close as possible below a load capacity value given in the table. This will increase the compression s which, in turn, results in a higher degree of insulation.
In general, medium to high frequencies can be very well insulated with sufficient compression.

Example

Static load F (machine weight) = 48,000 N, number of feet = 4, ergo: static load per foot = 12,000 N
Selected foot: d1 = 160, static load capacity 20,000 N, R = 9,000 N/mm
This results in an actual compression s of:

12,000 N (static load/foot) /
9,000 N / mm (stiffness R)

= 1.3 mm


With an interference frequency of 20 Hz (1,200 rpm), the above chart shows a degree of insulation of only about 20 %.

To optimize, the number of feet may be increased to 5, resulting in a static load per foot of 9,600 N. A leveling foot whose static load capacity is closer to the new result may now be selected.
Newly selected foot: d1 = 120 mm, static load capacity 10,000 N, R = 4,000 N/mmThis results in an actual compression s of:

9,600 (static load/foot) /
4,000 N/mm (stiffness R)

= 2.4 mm


With the same interference frequency of 20 Hz (1,200 rpm), the above chart now shows a degree of insulation of approximately 75 %.

Selected Part

Total US Dollars (net)
$87.72
In Stock: 35
In Stock
Please note our quantity discounts (US Dollars).
MinMaxPrice
16$87.72
799$84.53
100249$79.75
≥ 250$71.77
Prop 65: -
Please contact our Sales Department for more information.
RoHS: -
No details on RoHS compatibility are available at this time. Please contact our Sales Department for more information.
Weight: 2.866 lbs
If weight is not listed, please contact our Sales Department for additional information regarding weight.
Phone: 800-877-8351
All Prices are in US Dollars. Taxes Not Included.

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Our service team is available from Monday to Friday between 7:30 AM and 5:00 PM Central Time: 800-877-8351

Special Requests | Contact our sales team

GN 248-200-M20X1,5-206GN 248-80-M12X1,25-134GN 248-120-M16X1,5-150GN 248-160-M20X1,5-192

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