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To compensate for tolerances in Tenths of a millimeter Area and even below it George Martin One-layer, multi-layer or peelable shims. When using such fitting elements, the most important thing is to make the right selection in order to make the assembly processes efficient. For example, with the precision Shims the laminum and lamivario series setting the Rolling Optimize preload. 

Georg Martin Passcheiben roller bearings

 

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Multi-layer shims for rolling bearings

Georg Martin washers trio


For the service life and performance of tapered roller bearings and Angular contact ball bearings it is important that the axial preload is optimally adjusted during assembly. With the Laminum and Lamivario shims, this can be done in a playful way. The axial play when installing the Rolling They can be used for precise adjustments in drive assemblies.

The setting of the axial bearing play is particularly important when installing single and double rows Angular contact ball bearings, Four point bearings as well as single-row and double-row Tapered roller bearings important. Because this directly influences the service life, vibration behavior as well as noise behavior and heat generation of a rolling bearing application.

Set to half a µm beforehand

Georg Martin shim washers lifetimeWith the shim washers from Georg Martin, users can achieve up to 5,0 microns exact setting of the advance. This enables you to optimize the preload of the rolling bearings. In practice, this is achieved using the multi-layer shims of the Laminum and Lamivario line with their thin, peelable layers. This allows the user to easily achieve accuracies in the range of one or two tenths of a millimeter.

Machining and / or the storage of graduated rings can be omitted. With these shims, designers and fitters can use the Total tolerance of components dissolve and realize the correct preamble measure almost perfectly. Theoretically, this means that the life of the rolling bearings calculated by the manufacturers can be implemented to a large extent.

According to the Professor Dr. Stephen Sommer from the laboratory for quality management, manufacturing and rolling bearing technology at the FH Würzburg-Schweinfurt, the approximation to the optimal preload promises an increase in the life of the rolling bearing: "However, if you apply more than the optimum, the life curve drops steeply and there is an early failure .


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In view of this tightrope walk, some design engineers or fitters prefer to play it safe and opt for a clearer distance to the optimum. You can use up to 20 percent service life given away will. And this despite the fact that the rolling bearing manufacturers optimize their products down to the last detail. The safety buffer can grow by up to two tenths of a millimeter, especially since many users still allow influencing factors such as thermally induced material expansion to flow into it. "

Exact pre-tensioning instead of a safety margin

Georg Martin peel off the pass disk


Georg Martin PassringThe laminum and Lamivario Shims are mostly manufactured according to customer drawings. As standard, they consist of many wafer-thin, laminated or edge-welded metal foils made of steel, stainless steel, aluminum, Plastic and brass. Depending on requirements, the strength of the tuning ring is reduced by pulling it off or peeling it off. A typical film thickness is between 5,0 micrometers and 0,2 millimeters.

According to the managing director Christopher Martin The effort in upstream and downstream processes would be reduced if the OEM designer already integrated the multi-layer shim washers into his drawing: Rolling bearing assembly a huge leap in efficiency ”. 

The thicknesses and materials of the shim washers that can be pulled off or peeled off can be applied to almost every scenario of the axial Game setting in the rolling bearing assembly. "We can tailor the film composites so that their configuration corresponds to the respective assembly process and a single multi-layer washer covers all coordination tasks", says Mr. Martin.

This must be taken into account when using shims 

Christopher MartinBasically, the application decides whether and which shim washers for the Axial compensation the roller bearing ensures. Resilient compensating elements are better suited for high-speed rotations with an increased tendency to vibrate. In applications with high demands on the bearing rigidity such as the bearing of shafts in pumps, gearboxes, mining machinery or conveyor systems, shims are ideal. The installation location of the fitting element must also be taken into account.

“The question of where to install the passport washers should already be in the Construction phase be clarified. The quasi-static installation situation - for example between the housing and cover, is ideal for the use of the Laminum and Lamivario fitting elements. The cover then generates the preload via a flange on the roller bearing outer ring, ”says Christoph Martin.

Very thin spring band parts for the production of friction discs

Georg Martin friction disks21.06.2012: Manufacturers of friction disks today need very thin ones Precision drawing parts to order your specialcoatings. Georg Martin supplies them as part of the M-Tech series as tailor-made pre-products that can be further processed directly. Whether prototype, pilot series or large series - based on its flexible production, the company can provide almost any lot size with a quick delivery time and on time.  

During the Drive Technology play Friction disks a crucial role. In gears, Couplings as well as axle and steering systems, they ensure optimal torque transmission depending on the contact pressure, number of revolutions and friction. A well-known manufacturer has been relying on the punched and laser parts from Georg Martin GmbH for the production of its friction disks for several months. These mostly only 0,1 mm thick sheets are made of high-quality spring band steel and serve as a carrier for a diamond granulate, which is applied in a thermal process. The customer receives the thin sheets as dimensionally accurate and directly processable molded parts.

The 0.1 mm or 0.5 mm thick Spring band parts belong to the manufacturer's M-Tech product line. The company uses modern CNC punching and laser cutting systems as well as conventional precision punching machines for their production. The fine and thin sheets are available from 10 µ made of steel, stainless steel, aluminum, copper alloys as well as PET film and brass.

Peelable intermediate layer for lightweight construction and mechatronics

Georg Martin liner09.06.2011: Georg Martin presents one for the first time peelable shim made of plastic for tolerance compensation. The M-Tech L KP is suitable for use in lightweight constructions and mechanical assemblies. Compared to the products made of steel, aluminum and brass, it is now also penetrating the areas of application of traditional layer pads Metal before. In practice, it is not only the typical lightweight construction sectors that benefit from this. In addition to aviation, according to manufacturers, suppliers of mechanical drive technology such as gear manufacturers are showing keen interest in this plastic solution.

The shim is based on the Polyethylene terephthalate (PET) Mylar from Dupont and consists of several, only 0,1 mm thick, laminated plastic films. The PET offers high tensile and tear strength, good aging resistance and chemical, mechanical and thermal stability. It has a low density of around 1,3 kg / dm3 and belongs to the group of flat insulation materials of insulation class B (up to 130 ° C).

A central aspect in the development of the plastic interlayer was that easy handling of the peeling film. Similar to the foil in a blister pack, the user can pull off the individual layers of M-Tech L KP very easily, quickly and precisely with two fingers. In doing so, film by film, he approaches the required accuracy of fit. Unlike the intermediate layers made of steel, aluminum or brass, plastic films that have already been peeled off can be reused. Especially in transmission and vehicle construction, in aviation as well as in electrical and Measurement Technology there are numerous uses for M-Tech L KP. For example, it can be used to protect components from electrochemical corrosion. The very good electrical insulation is an additional plus.


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In the shape of discs, rings or plates M-Tech L credit offered as a customer-specific component. Martin uses a combination of machining and stamping technology to produce high-precision geometries, such as those required for rings with bores. The maximum dimensions for the plastic intermediate layers are 1200 x 600 mm in length or 600 mm in diameter. And the further development is already becoming apparent: The company is currently working on solutions with an accuracy of 0,050 mm and less. 

Tenth of a millimeter layered sheet metal to compensate for assembly tolerances

Georg Martin tenths of a millimeter19.08.2010: The use of intermediate layers to compensate for tolerances is now a small part of assembly design Engineer's basics. For all cases in which an accuracy in the hundredths range is not required, Georg Martin now offers a tenth of a millimeter layered sheet. It is an economical alternative to washers according to DIN 988 or custom-fit plates, especially for applications in gear construction, vehicle construction, aviation and mechanical engineering.

The shim washer belongs to the M-Tech L product line from individual foils with a maximum thickness of 0,1 mm and is offered in various thicknesses in aluminum (EN AW-Al99,5) and stainless steel (X5CrNi18-10).

With a film thickness of 0,1 mm, this counts Laminated sheet Although it is among the thicker ones in Martin's M-Tech L range (the company also produces films with a thickness of just 0,027 mm), it is an economical solution for tolerance compensation for numerous applications in the tenths of a millimeter. Especially for the assemblies Construction in gear, aviation, vehicle and mechanical engineering, it proves to be an economical alternative to conventional washers according to DIN 988 and intermediate layers.

Wherever accuracies in the micrometer range are not required, the new tenths of a millimeter laminated sheets will quickly achieve your goal. If only because, as a result of the greater gradation - compared to a 0,05 millimeter layered sheet, for example - the desired accuracy can be achieved with significantly fewer manual peeling processes. In addition, the new laminated sheets are very cost-effective, as the number of sheets required for this is very important Precision foils halved compared to the five-hundredth layer sheets. With the tenths of a millimeter laminated sheets, tolerances in mechanical assemblies can be compensated very flexibly.


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The maximum dimensions for the M-Tech L intermediate layers are 600 x 1200 mm. They can be in any geometry you want manufactured according to drawing will. As an alternative to the intermediate layers, the Dietzenbach-based supplier also offers the thinnest individual foils as well as solid compensation sheets that are sanded, self-adhesive or available in the range (M-Tech S) and packaged intermediate layers that are only glued on one edge and can be separated like a tear-off calendar ( M-Tech P).