DM and DD type dome Vibration Isolators

To optimize the selection of a vibration isolator one should consider:

device’s full mass
amount of points of support
load concentration on a point of support
rotational speed of spinning/rotating elements
possible deflection
fixing method to a mounted device

Dome vibration isolators selection and construction data tables.

Type and size of a vibration isolator	Axile load range [kg]	Natural vibrational frequency [Hz]	Maximum deflection [mm]	Minimum percentile effectiveness of vibration isolation at a specified driving frequency in [Hz] or [rpm]
Type and size of a vibration isolator	Axile load range [kg]	Natural vibrational frequency [Hz]	Maximum deflection [mm]	50 Hz 3000 rpm	25 Hz 1500 rpm
DM – A	25 – 350	12,8 – 5,6	3	89	83
DM – B	300 – 560	6,6 – 5,6	3	98	92
DD – A	500 – 700	5,4 – 5,1	6	99	95
DD – B	650 – 980	5,4 – 5,1	6	99	95

Type and size of a vibration isolator	Mass 1 pc. [kg]	Dimensions [mm]							Fixing method
		D	A	B	C	d	h*	H*	Mandrel**	Socket
		D	A	B	C	d	h*	H*	MxL[mm]	Mxg[mm]
DM	0,8	83	130	80	110	9	55	49	M12x69	M12x10
DD	2,5	131	190	120	158	17	86	78	M16x84	M16x12

* without load
** possibility of manufacturing a screw with a different thread M and length L.

Vibration isolator’s marking:
Dome vibration isolator XX-Y
XX – vibration isolator’s size (10-100)
Y – load range (A or B)

Exemplary order:
Dome vibration isolator DM pcs.
Dome vibration isolator DD pcs.

Load-deflection characteristics with natural vibrational frequencies of dome vibration isolators.

DM	DD

Mandrel– with leveling, mounting in threaded through holes

Order of operations:

anchor the vibration isolator to the floor or a support structure at the mounting location – make sure that the coaxiality is kept between the mounting mandrels and the holes in the base or the frame of a machine
lower a machine inserting the mounting mandrels into the holes in the base or the frame of the machine
level a machine by turning the lower leveling nuts right – lifting, left – lowering, level evenly on all mounting screws
secure the leveling of a machine by clamping a spring washer on the mounting screws using the upper locknut
verify the leveling of a machine after ca 1 week of operation and correct the leveling if required.

A machine should be leveled at a minimal distance from the floor or the support structure, keeping the mounting mandrels in a vertical position.

SOCKET – without leveling, mounting in unthreaded through holes

Order of operations:

anchor the vibration isolator to the floor or a support structure at the mounting location – make sure that the coaxiality is kept between the mounting sockets and the holes in the base or the frame of a machine
lower a machine on the vibration isolators and insert the mounting screws with spring washers through the holes in the base or the frame of the machine into the mounting sockets of the vibration isolators
screw a machine with the vibration isolators using the mounting screws

A mounting screw cannot stick out inside a vibration isolator – bending limitation, vibration isolator lock.

Pumps, compressors, generators, ventilators, cooling devices, air-conditioners and other machines and devices. (graph)

Dedicated for flexible mounting of machines and devices without foundations and with a possibility of anchoring to the floor or a support structure.

Vibration isolator’s construction allows an effective suppression of axial and lateral oscillations.

Over 95% vibration isolation effectiveness for mounting machines and devices driven to oscillate by elements rotating speeds higher than 1400 rpm.

High load range with compact dimensions.

Application in mounting:

Ventilators, air-conditioning and cooling devices.

Pumps, compressors, generators.

Other machines and devices driven to oscillate by rotating elements.

Isolation from vibrations and oscillations transferred by the floor.

Parameters:

Axile load range:

25 – 980 [Hz]

Natural vibrational frequency:

5,1 – 12,8 [Hz]

Maximum deflection range:

3 -6 [mm]

Fixing in:

Mandrel – with leveling
Socket – without leveling

Characteristics of a vibration isolator:

Ability to function in humid conditions, resistance to oil, grease, cooling liquids, hydraulic fluids, etc. Dampening layer made of oilproof elastomer based on nitrile rubber. Construction of the dampening layer prevents a displacement of a mounted device. Steel base plate protected with chlorinated rubber enamel – grey, other metal elements are galvanized.