GN 148 Levelling feet with vibration dampening element

Photo

GN 148 Levelling feet with vibration dampening element Type: B - with four-bolt flange (d1 = 113 / 126)
Type: B - with four-bolt flange (d1 = 113 / 126)
GN 148 Levelling feet with vibration dampening element Type: B - with four-bolt flange (d1 = 113 / 126) GN 148 Levelling feet with vibration dampening element Type: A - with two-hole flange (d1 = 60/90/113)

Product description

Information

Levelling feet GN 148 are designed for setting up heavy machinery and units with insulation against vibrations.

This has a positive impact on the lifetime of machines and additionally reduces the noise pollution.

The structure is such that horizontal forces are also absorbed.

The design with tear-off lock (type 2) protects the levelling feet from destruction caused by tear-off under excessive tension loads.

The details relating to the load bearing capacity are non-binding recommended 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

Vibration dampening element
Natural rubber (NR)
  • vulcanized
  • temperature resistant up to 80 °C
  • Hardness Shore A ±5
    soft*43
    medium57
    hard*68

Sheet metal
zinc plated, blue passivated

Threaded insert
Steel
zinc plated, blue passivated

RoHS

Accessory

Rubber pads GN 148.2

Technical drawing

3D
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GN 148 Levelling feet with vibration dampening element sketch

Article options / Table

Type

Awith two-hole flange (d1 = 60/90/113)
Bwith four-bolt flange (d1 = 113 / 126)

Identification no.

1without tear-off lock
2with tear-off lock
Show / Hide columns
d1d2d3d4
Type A
d5
Type B
h
sb
Type A
l1
Type A
l2
Type B
m1
Type A
m2
Type B
60M 10789-30278128-110-
90M 1210613-393110170-140-
113M 1615012,512,5524150216168184132
126M 20177-13634--184-150
* not available from stock, requires a minimum order quantity

Build & Price

Foot diameter d1
Thread d2
Type


Identification no.


Hardness



Terms

Drawing Terms GN 148

F1 = static load in vertical direction (pressure)
F2 = static load in horizontal direction (lateral thrust)
s1 = Compression in vertical direction (spring excursion) under load through F1
s2 = Compression in vertical direction (spring excursion) under load through F2

Stiffness R:
is the load which causes the dampening elements to be compressed by 1 mm (spring rate)

Equation for calculating the stiffness: R = F/S

The table below gives details on the maximum static load F, the maximum rated compression and the resulting stiffness R.
The method shown below and the values given below allow the maximum degree of insulation of the vibration to be determined as factor of the interference frequency.

Show / Hide columns
d1Hardness 
in Shore
max. static load F1 in NStiffness R1 in  N/mmmax. compression s1 in mmmax. static load F2 in NStiffness R2 in N/mmmax. compression s2 in mm
6043*11003403223007703
6057175055032340011303
6068*28009303400011303
9043*15004303530007504
905728008003550001330375
9068*450012903570001870375
11343*35001000354500129035
1135765001860357500214035
11368*1000028603511000314035
12643*75002140359000257035
126571250035703515000429035
12668*1900053403522500643035

* not available from stock, requires a minimum order quantity

Example of application

Drawing example of application GN 148

Degree of isulation

Drawing isulation GN 148

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

Static load F [N]:
is the load acting on each vibration-dampening element (levelling foot).

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

Compression s [mm]:
is the change in the height of the dampening element (spring excursion).

Stiffness R [N/mm]:
is the load causing the dampening element to be compressed by 1 mm (spring rate).

Determining the suitable levelling foot and the maximum degree of insulation

The first step is to determine the static load F for each levelling foot. With favourably arranged levelling feet and therefore an evenly distributed load F, this value is calculated using the following equation:


Force due to weight of the machine [N] / Number of levelling feet

= static load F [N] for each levelling foot


Use the calculated static load F to select a levelling 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 levelling foot is also taken from the table.
The actual compression is then calculated using the equation below:


Static load F [N] per levelling foot /
Stiffness R [N/mm]

= actual compression s [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 graph shown above.
To optimise the achievable degree of insulation, the number of levelling feet may be changed such that the static load F for each 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 it can be said that medium to high frequencies can be very well insulated with sufficient compression.

Selected Part (How to order)

Price
On request   
In stock
Weight: 0,238 kg
If this article is new in our product range, it may happen that details concerning weight are as yet not listed.
If you do need weight details, please contact our Sales Department!
Phone+49 7723 6507 - 0
RoHS: Yes
This article is RoHS-compliant in application of Annex III., which means it complies with EU Directive 2011/65/EU, including extension (2015/863/EU), for restricting the use of certain hazardous substances in electrical and electronic devices. The Directive regulates the use of hazardous substances in devices and components. The implementation in national law is summarily described with RoHS(Restriction of (the use of certain) hazardous substances)).
Please note our quantity discounts.
With a total value (net) per order:
from 175,00 Euro -> 10 % discount
from 275,00 Euro -> 20 % discount
from 375,00 Euro -> 30 % discount
With a total value (net) per order:
All prices in accordance with our price list No. 52, valid from 1 May 2019, plus VAT only valid for Germany.

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