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You are here: Product Overview > 3.4 Installing, Lifting, Damping with Leveling Feet, Lifting Gear and Rubber Elements > Leveling Feet > GN 148 Leveling Feet previous product next product

GN 148 Leveling Feet with Vibration Damping Element

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GN 148 Leveling Feet with Vibration Damping Element Type: A - With two-hole flange (d<sub>1</sub> = 60 / 90 / 113)

Type: A - With two-hole flange (d₁ = 60 / 90 / 113)

GN 148 Leveling Feet with Vibration Damping Element Type: A - With two-hole flange (d<sub>1</sub> = 60 / 90 / 113)

GN 148 Leveling Feet with Vibration Damping Element Type: B - With four-bolt flange (d<sub>1</sub> = 113 / 126)

Standard sheet GN 148 Print this page Technical information Determining the suitable levelling foot Plastic Characteristics

Product description

Information

Leveling 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 leveling 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 damping element
Natural rubber (NR)

Vulcanized
Temperature resistant up to 80 °C
Hardness Shore A ±5
Soft43
Medium57
Hard68

Sheet metal
zinc plated, blue passivated

Threaded insert
Steel
Zinc plated, blue passivated

RoHS

Accessory

Rubber Pads GN 148.2

Technical drawing

GN 148 Leveling Feet with Vibration Damping Element sketch

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GN 148 Leveling Feet with Vibration Damping Element sketch

Article options / Table

Type

A	With two-hole flange (d₁ = 60 / 90 / 113)
B	With four-bolt flange (d₁ = 113 / 126)

Identification no.

1	Without tear-off lock
2	With tear-off lock

Show / Hide columns

d₁	d₂	d₃	d₄ Type A	d₅ Type B	h	s	b Type A	l₁ Type A	l₂ Type B	m₁ Type A	m₂ Type B

60	M 10	78	9	-	30	2	78	128	-	110	-
90	M 12	106	13	-	39	3	110	170	-	140	-
113	M 16	150	12,5	12,5	52	4	150	216	168	184	132
126	M 20	177	-	13	63	4	-	-	184	-	150

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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.

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d₁	Hardness in Shore	max. static load F₁ in N	Stiffness R₁ in N/mm	max. compression s₁ in mm	max. static load F₂ in N	Stiffness R₂ in N/mm	max. compression s₂ in mm

60	43	1100	340	3.2	2300	770	3
60	57	1750	550	3.2	3400	1130	3
60	68	2800	930	3	4000	1130	3
90	43	1500	430	3.5	3000	750	4
90	57	2800	800	3.5	5000	1330	3.75
90	68	4500	1290	3.5	7000	1870	3.75
113	43	3500	1000	3.5	4500	1290	3.5
113	57	6500	1860	3.5	7500	2140	3.5
113	68	10000	2860	3.5	11000	3140	3.5
126	43	7500	2140	3.5	9000	2570	3.5
126	57	12500	3570	3.5	15000	4290	3.5
126	68	19000	5340	3.5	22500	6430	3.5

Example of application

Degree of isulation

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 [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.

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Part number

Total (net)

27,56 €

plus VAT 5,24 €
gross 32,80 €

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 order discounts.

With a total value (net) per order:
from 175,00 € -> 10 % discount
from 275,00 € -> 20 % discount
from 375,00 € -> 30 % discount

Surcharge for small volume purchases:
-> 15,00 Euro
for value of goods less than 25,00 €
-> 10,00 Euro
for value of goods from 25,00 to 50,00 €

Quantity

All prices in accordance with our price list No. 55, valid from 1 September 2022, plus VAT only valid for Germany.

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