Our customers in the USA are managed by JW Winco. Please, use the website of JW Winco: jwwinco.com
Our customers in the USA are managed by JW Winco. Please, use the website of JW Winco: jwwinco.com
The specified load in the above table of the leveling feet GN 342.1 is a recommendation up to which the dampening element can be permanently subjected.
This static load equals a thrust on the area of 0,4 N/mm2, at which the damping material reaches its optimum dynamic dampening ability. This also takes into account an additional load up to 0,6 N/mm2 in the event of a dynamic load.
Leveling feet GN 342.1 can not be disassembled.
Steel
Damping element
Elastomer (PUR)
Hexagon nut ISO 4032
Steel zinc plated, blue passivated
RoHS
| SV | With damping element |
| d1 | d2 | d3 | l2 | l3 | l4 Compression in N/mm² 0 | 0,4 | 0,6 | A/F | t | Area damping element in mm2 | Load in N by compression 0,4 N/mm² (see information) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 32 | M 10 | 30 | 29 | 11 | 5,5 | 3,8 | 2,7 | 15 | 10,5 | 707 | 280 |
| 40 | M 12 | 38 | 30 | 9,5 | 6 | 4,3 | 3,3 | 17 | 11,5 | 1134 | 450 |
| 50 | M 12 | 48 | 30,5 | 9 | 6,5 | 4,9 | 3,9 | 17 | 11,5 | 1809 | 720 |
| 60 | M 16 | 58 | 37,5 | 10 | 7 | 5,5 | 4,4 | 24 | 16 | 2641 | 1050 |
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When using levelling feet GN 342.1 the following differentiation in vibration absorption is made: Active vibrations: Passive vibrations: The efficiency of vibration absorption is dependent upon the interference frequency of the vibration to be absorbed as well as on the resonant frequency of the dampening element itself. A vibration absorbing effect is only achieved when the interference frequency is greater than √2-times the resonant frequency of the dampening element. The greater the difference [∆] between the two, the better the dampening effect. The resonant frequency of the dampening pad is dependent upon type (composition) of the material cross section and the static load. The graphs on the left show all the required data of the standard material (SR 450-12) of the dampening element. Dampening elements with other absorption properties are available on request. |
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Assume a load per levelling foot: 400 N Compression levelling foot d1 = 32 400 N / 707 mm² = 0,57 N/mm² Compression levelling foot d1 = 40 400 N / 1134 mm² = 0,34 N/mm² Therefore levelling feet with d1=40, that exert a pressure of 0,4 N/mm² should be preferred. The above graph shows: Resonant frequency with compression 0,34 N/mm²:17,5 Hz The lower graph shows: Degree of isolation at 66 Hz interference frequency (P1): 92 % At approximately 200 Hz interference frequency the degree of isolation is 100%. |
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