ISOLOC Schwingungstechnik GmbH - faq


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	FAQ's - Frequently Asked Questions

	Must both threaded holes be used when fixing the ISOLOC UMS by screws?

		No, using one of them is sufficient.


	What is the advantage of an elastic installation with a high damping?

		Damping is dissipation of energy (transformation of motion energy in thermal energy). This means a fast fading away of free vibrations of an impact excitement (e. g. with presses etc.), faster fading away of the amplitudes of an elastically installed machine as well as reduction of resonance over-height in the case of resonance. These can occur e. g. when starting or switching off a machine or with an impact excitement.


	Do the elastically installed machines have to be anchored?

		The elastically installed machines do not have to be anchored in 95 % of all cases. They can be installed free due to the high friction coefficient of the ISOLOC elements. If it is necessary to anchor please note that they are isolated against vibrations with elastic elements (e. g. Ronkap). This is important to avoid that the vibration insulation is impaired.


	Do I need levelling for a good vibration insulation?

		First of all, it is important to use vibration insulation elements adjusted in the right way for the actual vibration insulation. The quality and the precision of levelling depends on the machine type, e. g. press or machine-tool etc. In general, machine-tools have to be levelled very precisely so that they can be run with e. g. tool changing systems which stand often separately from the machine. Therefore it is recommended to use by all means elements which can be levelled for machine-tools. If levelling is unequal tilting movements may occur which have negative effect on the vibration insulation.


	What is the maximum admissible floor unevenness when using ISOLOC elements?

		The level difference of the bearing surface at the mounting point should be max. ± 0,1 mm over the length or width of the ISOLOC element in use and max. 0,25 mm for 1 m. However, these data depend on the type of the machine to be installed and the use of the insulation system.


	Can floor unevenness be compensated with IPL, GPL and IPK?

		Floor unevenness can be compensated, depending on the ISOLOC type in use and its elasticity.


	When must machine shoes with inclination compensation (sphere ring compensation) be applicated?

		With slopes in the floor > 1 ° or with large, long machines with many mounting points. Otherwise there will be unequal loads on the machine shoes or at the machine.


	What is the deformation of the ISOLOC vibration insulation panels and packs like?

		The deformation of the ISOLOC insulation panels is different, depending on the type, but due to new special materials it is very small. Please demand our data sheets!


	What is the delivery time of standard articles of ISOLOC?

		ISOLOC standard articles can be supplied ex stock Stuttgart.


	Are your pads resistant to oils, cleaning agents, lyes etc.?

		Most of the used ISOLOC materials are very well or well resistant to oil and cleaning agents, coolants, lubricants, lyes and different acids etc. Please demand more information or ask us indicating the utilized medium.


	Are your products suitable for noise reduction?

		The standard products are not effective for the insulation of vibrations and structure-borne sound of machines and plants for the directly beamed air-borne sound (noise). However, secondarily beamed air-borne sound at walls and other parts of the building are reduced partly by 3 – 7 dB (A) due to the insulation of structure-borne sound.


	What machine data etc. needs ISOLOC to determine a vibration insulation and to elaborate a quotation?

		For simple standard insulations we need the following information: - machine weight incl. weight of workpiece/tool - kind and type of the machine - size of dynamic forces or moving masses - position of centre of gravity - number and dimensions of mounting points - indication if a machine has to be anchored - information about rigid connections and feedings to the machine or chained units - place of installation of the machine, e. g. ground floor or upper floor. Just use our ISOLOC questionnaire on our contact page.


	Are the ISOLOC vibration insulation and anti-slip panels silicon- and PVC-free?

		Yes, all ISOLOC vibration insulation and anti-slip panels are silicon- and PVC-free.


	What is vibration insulation?

		Due to a vibration insulation, shock, i. e. mechanical vibrations that are noticed by men, and structure-borne noise, i. e. mechanical vibrations that lead secondarily to air-borne noise, are reduced. By a vibration insulation, the forces coming from a machine (active insulation) and the caused vibrations are reduced.


	How does a vibration insulation work?

		With a vibration insulation, the forces coming from a machine (active insulation) and the caused vibrations are reduced. The remaining forces (foot forces) should not be smaller than the mass forces. A vibration insulation is also called mass force compensation. The mass of the system to be protected has to move so that mass forces occur that counter-act the exciting forces in the undamped case so that the forces (active insulation) exceeding the system (machine) are reduced. The desired reductions can only be achieved if the insulation natural frequency of the system to be protected is considerably lower (> fold) as e. g. the frequency of a machine in operation.


	What is insulation of structure-borne sound?

		Insulation of structure-borne sound (also vibration quieting) is a vibration insulation of frequencies above 50 – 100 Hz. The transmission of structure-borne sound is reduced which spreads in a firm body, is beamed secondarily as air-borne sound and then disturbs primarily men.


	What is insulation of impacts?

		An impact is in general a broad-banded excitation. With an insulation of impacts the forces coming from a machine are reduced that are caused by an impact excitation. It is called insulation of impact if the transmission of impact-like vibrations from the floor to an object are reduced, e. g. insulation of an earth impact (earthquake). As impact-like excitations are broad-banded excitations, forces or vibrations in the environment of the installation natural frequency are reinforced. The size of this reinforcement depends on the damping grade.


	What is vibration damping?

		Vibration damping is the transformation of mechanical moving energy of a system in another energy form, e. g. warmth.


	What is vibration amortization?

		Vibration amortization is a reduction of vibrations under limited conditions. The effect of the vibration amortization requires the coupling of an additional mass and a rigidity and a given vibration capable system. Vibration amortization is always a compensation of mass force; the mass forces originate at an additional mass and not at the mass at which the excitation affects.


	When has a machine to be anchored?

		Anchoring to the floor is recommended in the following cases: machines that have a one-sided centre of gravity (high non-central centre of gravity with small ground contact area) machines with high horizontal forces and relatively smaller natural mass


	What does UMS-ASF, -DSF, -ASA, -DSA, IPL, GPL, IPK mean?

		UMS: universal-precision-machine-shoe ASF: screw-on and free-standing DSF: through-bore and free-standing ASA: screw-on with inclination compensation DSA: through-bore with inclination compensation IPL: insulation panel GPL: anti-slip panel IPK: insulation pack


	How has a UMS machine shoe to be installed?

		The levelling spindle should always show to the outer machine edge. The thick vibration insulation panel on the UMS should always stand on the ground. The machine pedestal stands on the thin anti-slip panel.


	What is vibration quieting?

		Vibration quieting is insulation of structure-borne sound.


	What is resonance?

		Resonance occurs only if a natural frequency is identical with an exciter frequency and the tuning relation of the exciter frequency to the natural frequency is = 1. The size of the reinforcement depends on the damping.


	What is natural frequency?

		A system consisting of spring and mass capable of vibrating has characteristic natural frequencies (resonance frequencies of first and higher degree). The natural frequency can be influenced by changing the rigidity of the mass or the spring. The natural frequency is a system feature.


	In what unit is a frequency normally indicated?

		In Hertz (Hz).


	From what frequency relation (exciter frequency to natural frequency) does a vibration insulation work?

		From a frequency relation / of > (1,414). (This is only valuable for a mass-damper-spring-system with single degree of freedom.)


	How is the effect of a vibration insulation indicated in general?

		As insulation effect grade with the unit %. The insulation effect grade indicates how many percent of the exciter forces are reduced.


	How is the loadability of the ISOLOC vibration insulation panels and packs indicated?

		The loadability is indicated as compressive stress with the unit N/cm² or N/mm².


	What is a source insulation?

		Reduction of the forces coming from a system capable of vibrating. Formerly also called active vibration insulation.


	What is a receiver insulation?

		Protection of a body, a machine or plant against vibrations or shock coming from outside. Formerly also called passive vibration insulation.


	When have horizontal supports (HOAW, HOA60) to be used with an elastic installation of a machine?

		With very high horizontal forces inside the machine in order to limit the horizontal amplitudes and with a very elastic vibration insulation in order to avoid possible occuring tipping movements. Examples: screw presses, spindle presses, extremely elastically installed machining centres on upper floors.


	When do I require a foundation isolated against vibrations (sprung foundation)?

		1. The machine or plant requires an installation on a foundation for reinforcement. This can be e. g. measuring machines, printing machines or very long lathes and drilling units. For this reason, the elastic vibration insulation elements have to be placed under the additional mass (mostly concrete block). 2. Weight increase by additional mass and therefore lower installation natural frequency with same number of vibration insulation elements due to higher compressive stress. 3. With installation natural frequency remaining the same to reduce the amplitudes of the machine installed isolated against vibrations inclusive the foundation. 4. Reduction of the amplitudes (absolute movement) of the elastically installed machine by the higher inertia mass. Precondition: overall rigidity of the vibration insulation remains constant in spite of higher mass = more vibration insulation elements. The elements in use are less stressed. Additional reinforcement of the machine, smaller mass forces act on the components of the machine (longer life).


	What is a sprung foundation insulation?

		A sprung foundation insulation is in the far sense every vibration insulation that is not directly placed under the machine, but under the machine foundation (mostly concrete block). Such a machine foundation is usually countersunk in the ground in a foundation well.


	Are also ISOLOC machine shoes in stainless steel available?

		No. We recommend the nickel-plated version. Please ask us.


	Can with ISOLOC also a building be installed isolated against vibrations?

		Yes, please see the reference Swiss Embassy in Berlin.


	What has to be paid attention to for an elastically installed machine that is anchored to the ground?

		It is important that the screws are isolated by appropriate insulation discs (e. g. Ronkap) against vibrations, otherwise there is the danger of a vibration transmission. Furthermore, the preload force indicated by ISOLOC has to be kept so that the vibration insulation remains in function.


	Are the ISOLOC products UMS, NT, NTS, NTR also in another colour available?

		Of course we can supply the products in every desired colour. Please ask us.


	How do the ISOLOC vibration insulation panels and packs and machine shoes have to be loaded?

		Always on the whole surface, as otherwise there can be overloadings or the function of the vibration insulation is impaired.


	Are there larger dimensions than 500 x 500 mm of the vibration insulation panels?

		The normal panel is 500 x 500 mm for production reasons. But several panels can be glued at their edges so that larger dimensions are possible. However, due to the very high loadability of the insulation panels this is only necessary for very heavy machines.


	Does the change of the colour of some insulation panels because of the sunbeams impair the functionality and durability?

		No, the change of the colour, especially of our yellow insulation panel IPL10 (becomes brown under the influence of sunlight), does not impair the functionality and durability of the insulation panel.


	What is the friction coefficient of the ISOLOC vibration insulation panels?

		The friction coefficient is a unit without any dimension and indicates the relation between the normal force (in N) and the friction force (in N).


	Has a vibration insulation panel with a profile a higher friction coefficient than one without a profile?

		In general the profile has no direct effects on the friction coefficient. If a panel has a profile or not has no effects on the friction coefficient. E. g. the vibration insulation panel without profile IPL40 has a higher friction coefficient than the vibration insulation panel IPL10 with a profile.


	What shore hardness have the vibration insulation panels?

		IPL5: 40 Shore (A) IPL6: 35 Shore (A) IPL10: 60 Shore (A) IPL17: 70 Shore (A) IPL20: 75 Shore (A) IPL25: 75 Shore (A) IPL30: 90 Shore (A) IPL40: 70 Shore (A).


	What influence has the shore hardness on the vibration insulation features?

		The shore hardness has only slight meaning for the judgement of the vibration insulation features. In order to estimate the “effect” of a vibration insulation panel, only the dynamic characteristics are decisive, i. e. the dynamic natural frequencies (ƒ0v, ƒ0h) and the damping grade (Dv, Dh).


	Where is ISOLOC used?

		- machine-tools of all kind, lathes, milling machines, machining centres, grinding machines, transfer lines - printing and paper machines such as paper cutting machines, collective folders - presses, punches of all kind such as eccentric presses, spindle presses, crank presses, hydraulic presses and punches, forging presses, board shears - plastic working machines such as e. g. injection moulding machines - extrusions, fans - pumps, generators, engines, compressors - transformers - mills, crushing machines - packaging machines - conveyor belts - laboratory units, scales, measuring machines - buildings, steps, steel constructions - crane runways - wired circuit boards drilling machines - etc. In general ISOLOC systems can be used everywhere when vibrations or shock emerge. Just ask us!


	Up to what temperature ISOLOC vibration insulation panels can be used durably?

		Up to 60 °C. The insulation panels can also be used with higher temperatures for a short term depending on the type. Please ask us.


	Are the ISOLOC vibration insulation and anti-slipping panels recycable?

		Volcanized rubber is not recycable as fission in the original chemical materials after volcanization is not possible.


	Can conventional glue be used to stick the ISOLOC vibration insulation panels?

		No, as the ISOLOC vibration insulation panels are partly very resistant to solvents a special ISOLOC glue is necessary which we supply also separately in 50 ml and 500 ml bottles.


	Why ISOLOC vibration technology?

		At ISOLOC you obtain an individual and competent consultancy by qualified experts of our in-house and field staff for all branches in the production field up to complicated analyses and calculations in vibration engineering terms. This brings clearness for the right solution, also of very difficult problems. You receive everything from one company: most modern measuring and analysing technology as well as proposition of the technically and economically optimum materials. The company ISOLOC has a very wide product range that is completed by ergonomic mats for standing jobs.


	Do the levelling discs already comprise screws?

		No, as each levelling disc has different screw lengths and diametres they have to be ordered separately.


	Of what material are the levelling discs, screws and machine shoes made?

		The levelling discs and machine shoes are mainly in casting GG25, the standard screws in zinc-plated free-cutted steel or in stainless steel 1.4301.


	Do the ISOLOC ERGOMED and ERGOFLEX mats have tapered edges?

		All ISOLOC ERGOMED mats have tapered edges on all sides which offer the highest possible security. Also the ERGOFLEX mats standard with the dimensions 1 500 x 1 000 mm have tapered edges on all sides. The ERGOFLEX mats 2 000 x 1 000 mm have even edges on all sides.


	Do you deliver free of cost?

		Our standard delivery conditions are ex works, without packaging.


	Why do the ISOLOC vibration insulation panels have different colours?

		The different colours make the choice easier and leads to the right product. For follow-up orders it is sufficient knowing the colour without indicating the exact product description.


	When is a NT levelling disc and when a NTS levelling disc used?

		The NTS levelling discs are used when machines or systems are often moved. They bring the advantage that the levelling disc remains connected to the screw or the machine even when lifting. In all other cases NT levelling discs can of course also be used.


	What is 1 Newton?

		In general the weight of a body is indicated in kg or t, but this is not correct. The mass m of a body is indicated in kg and is calculated of the volume V x of the specific density , thus [dm³ x kg/dm³]. The weight or the weighing force F_G of a body with a determined mass m is indicated in Newton [N] or in Kilonewton [kN] and depends on the "falling acceleration" g [9,81 m/s²] which is e. g. on the moon only 1/6 of the falling acceleration on earth. F_G = m x g or more general for forces F = m x a in N example: 10 N correspond to approx. 1 kg.


	What is the tuning frequency?

		Simplified, the tuning frequency is the natural frequency(s) of the vibration insulation elements.


	What is the difference between vibration emission and immission?

		Protection against emission is source insulation, reduction of transmissions. Protection against immissions is receiver insulation, protection against transmissions.


	What is an overcritical/low and what is an undercritical/high tuning?

		= / > = low/overcritical tuning = / < 1/3 = high/undercritical tuning. (caution: Here is no vibration insulation!)


	Has a machine to be underlaid on the whole surface with ISOLOC vibration insulation panels?

		No, this would bring no advantage in vibration engineering terms. The ISOLOC systems require a certain pre-tension (compressive stress) so that the necessary elasticity is achieved.


	How long does an insulation work?

		If the installation guidelines, the loadability figures (static and dynamic) and the resistance against chemicals are paid attention to we guarantee normally at least five years. ISOLOC vibration insulation and anti-slipping panels have an extremely slow ageing and keep their chemical and physical characteristics over many years. Please ask us in special cases.


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