GN 148-ALeveling Feet

with two-hole flange

with Vibration Damping Element

GN 148-A

Catalogue
d1
d2
d3
d4
h
s
b
l1
m1
GN 148-60-M10-A-1-43
60
M 10
78
9
30
2
78
128
110
238
GN 148-60-M10-A-2-43
60
M 10
78
9
30
2
78
128
110
282
GN 148-60-M10-A-1-57
60
M 10
78
9
30
2
78
128
110
250
GN 148-60-M10-A-2-57
60
M 10
78
9
30
2
78
128
110
279
GN 148-60-M10-A-1-68
60
M 10
78
9
30
2
78
128
110
245
GN 148-60-M10-A-2-68
60
M 10
78
9
30
2
78
128
110
280
GN 148-90-M12-A-1-43
90
M 12
106
13
39
3
110
170
140
717
GN 148-90-M12-A-2-43
90
M 12
106
13
39
3
110
170
140
806
GN 148-90-M12-A-1-57
90
M 12
106
13
39
3
110
170
140
725
GN 148-90-M12-A-2-57
90
M 12
106
13
39
3
110
170
140
809
GN 148-90-M12-A-1-68
90
M 12
106
13
39
3
110
170
140
730
GN 148-90-M12-A-2-68
90
M 12
106
13
39
3
110
170
140
815
GN 148-113-M16-A-1-43
113
M 16
150
12.5
52
4
150
216
184
1643
GN 148-113-M16-A-2-43
113
M 16
150
12.5
52
4
150
216
184
1854
GN 148-113-M16-A-1-57
113
M 16
150
12.5
52
4
150
216
184
1641
GN 148-113-M16-A-2-57
113
M 16
150
12.5
52
4
150
216
184
1900
GN 148-113-M16-A-1-68
113
M 16
150
12.5
52
4
150
216
184
1713
GN 148-113-M16-A-2-68
113
M 16
150
12.5
52
4
150
216
184
1975

Types

  • Type A: with two-hole flange (d1 = 60 / 90 / 113)
  • Type B: with four-hole flange (d1 = 113 / 126)

Identification no.

  • No. 1: without tear-off lock
  • No. 2: with tear-off lock

Vibration damping element

Natural rubber (NR)

vulcanized

temperature resistant up to 80 °C

Hardness [Shore A ±5 °]

soft 43

medium 57

hard 68

Sheet metal

zinc plated, blue passivated

Threaded insert

Steel

zinc plated, blue passivated

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.

 

F1 = static load in vertical direction (pressure)

F2 = static load in horizontal direction (lateral thrust)

s1 = Compression in vertical direction (spring excursion) under load thorugh F1

s2 = Compression in vertical direction (spring excursion) under load through F2

Stiffness R:

is the load which causes the damping 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 and the values given below allow the maximum degree of insulation of the vibration to be determined as a factor of the interfence frequency.

d1Hardness in Shoremax. 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
604311003403.223007703
605717505503.2340011303
606828009303400013303
904315004303.530007504
905728008003.5500013303.75
9068450012903.5700018703.75
11343350010003.5450012903.5
11357650018603.5750021403.5
113681000028603.51100031403.5
12643750021403.5900025703.5
126571250035703.51500042903.5
126681900053403.52250064303.5

Terms

Interference frequency [Hz]:

is the frequency emanating from a machine, e.g. the

machine main shaft speed [rpm].

Static load F [N]:

is the load acting on each vibration-damping element (levelling foot).

Degree of insulation [%]:

is the measure for absorbing the interference frequency (damping).

Compression s [mm]:

is the change in height of the damping element (spring excursion).

Stiffness R [N/mm]:

is the load which causes a damping element to be

compressed by 1 mm (spring rate).

 

Determining the suitable levelling foot and the maximum degree of insulation

First, the static load F for each levelling foot must be determined. For well arranged levelling feet and the resulting even distribution of the load F, the static load is calculated using the following equation:

Weight force of the machine [N] / Number of levelling feet = Static load F [N] / per levelling foot

Once the static load F has been calculated, select a levelling foot from the table. Please note that the static load F should be as close as possible to the static load capacity, but without exceeding it. The associated stiffness R of the selected leg is also shown in 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 actual compression s calculated, the maximum degree of insulation as factor of the interference frequency can now be read in the above chart.

To optimise the maximum degree of insulation, change the number of feet such that the static load F of each levelling foot is as close as possible below a static load capacity value given in the table. This will increase the compression s which, in turn, improves the degree of insulation.

In general, medium and high frequencies can be very well insulated with an adequate compression.

 
Related products
Steel base plate

DVA.1

Rubber buffers Rubber and steel or stainless steel
Steel base plate

DVA.4

Rubber buffers Rubber and steel or stainless steel
Steel base plate

DVA.6

Rubber buffers Rubber and steel or stainless steel
Rubber pads

GN 148.2

Rubber pads for levelling feet GN 148
Levelling feet

GN 342.1

Levelling feet with vibration damping / female thread
With / without nut, external hex at the bottom

GN 41-S/SK

Leveling Feet Stainless Steel
Vibration-damping levelling elements

LW.A

Vibration-damping levelling elements Steel base and stem