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Sensorfit encoder coupling: Accurate in special environments

12.01.2023

When it comes to precise measuring tasks in corrosive or special atmospheric ambient conditions - encoders and sensors designed for this need a reliable and coordinated partner as a compensating coupling. You have found this with the new Sensorfit encoder coupling.

The lightweight and modular compensating coupling has innovative clamping hubs made of the high-performance plastic PPS (polyphenylene sulphite) 40% glass-fibre reinforced. This high-temperature resistant thermoplastic polymer is extremely low in outgassing and resistant to various chemicals, cleaning agents and water vapour and at the same time meets the requirements for applications in the food sector. The careful matching of the other coupling components consisting of the functional element made of POM, the chemically nickel-plated locating pins as well as the radially operable, self-locking thermoplastic screws - optionally made of steel with zinc-nickel coating or stainless steel - make the Sensorfit the choice as a precise and displacement-friendly encoder coupling, for example for vacuum, medical technology and pharmaceutical applications or applications under the influence of corrosive media.       

Thanks to its modular design, the Sensorfit is extremely versatile and can be freely combined with the most common bore diameters. 
 

Learn more about the Sensorfit


Servoflex - your servo drive will fancy it

15.12.2022
Backlash-free couplings for modern servo systems are required to fulfil increasingly complex tasks. For machines with optimised cycle times providing ever-increasing output rates, coupling systems are needed which operate with absolute reliability and high precision, in line with the required positioning and repeat accuracy. Furthermore, a low moment of inertia is an essential feature for these dynamic work processes.

High torsional stiffness combined with low rotational inertia

With Servoflex, you can rely on a backlash-free range of couplings intended to fulfil precisely the demanding requirements of modern servo drives. Dynamic drive applications with frequent start-stop and reversing operation, where absolute positioning accuracy comes to the fore, are their forte. As a result of its structure made of lightweight aluminium components combined with a torsionally stiff yet flexible disc pack, this backlash-free coupling features a lightweight design along with high torsional rigidity.
The design of the disc pack itself is calculated and optimized based on FEM analyses. Layered flexible discs made of stainless steel form a disc pack with outstanding torsional stiffness for high-precision drive applications. The clamping hubs and the intermediate piece of the double-cardan version are made of high-strength aluminium and, therefore, feature low rotational inertia, which is essential for dynamic positioning and feeding tasks. In addition, for some coupling sizes, the backlash-free servo coupling is supplied with offset hubs on one or both sides, depending on the selected bore diameter. This means that rotational inertia is further reduced for smaller and medium-sized bore diameters.

14 coupling sizes for up to 250 Nm rated torque

The portfolio includes a wide array of services. The product portfolio comprises 14 coupling sizes in a nominal torque ranging from 0.25 to 250 Nm.  Couplings come both as single-cardan and double-cardan versions. The single-cardan version combines the highest possible torsional stiffness with a very compact design. It enables the compensation of axial and angular shaft misalignments.
Combining two single-cardan couplings for multi-axis systems is an ideal option to an intermediate shaft coupling when it comes to high-precision, synchronised work processes. Besides the displacement options mentioned for the single-cardan version, the double-cardan design compensates for radial displacements. Due to its high torsional stiffness, it is the ultimate solution in dynamic applications in which a high-precision movement sequence, in connection with the compensation of universal shaft misalignments, is a critical requisite.

High positioning and repeat accuracy in the cutting process

Waterjet cutting technology is used across all industries to cut a broad variety of materials. In addition to metals, these can also include glass, granite, composite materials or plastics. As a result of this technology which processes materials with almost no heat input, there are no deformations in the cutting area, with positive effects on the quality of the trimmed edges obtained. Water is compressed at an up to 6000 bar pressure in the water jet cutting process. Depending on the type of requirement and workpiece, the latter is then pressed through customised nozzles with special diameters. As a result, the exit speed required for precise cutting processes can be reached.
 

The Servoflex promotes high-precision positioning and repeat accuracy

In order to provide the high-precision positioning and repeat accuracy required by the cutting process, a servomotor and ball screw can operate in the axes of a cutting machine designed as a portal system in conjunction with a Servoflex coupling type SFC 050D. Designed as a double-cardan version, the coupling size with a 56 mm outer diameter features torsional stiffness of 16,000 Nm/rad, thus providing the necessary torsional rigidity and precision. With a view to also achieving high cutting performance and speed, the system works dynamically within a continuous acceleration and stopping reverse process.  The Servoflex is riding high thanks to its extremely low rotational inertia. Through the selected bore diameter, the coupling is also equipped on one side with an offset clamping hub with low rotational inertia. The design size has a nominal torque transmission capacity of 25 Nm and can compensate for radial and axial displacements of up to 0.28 mm and 0.8 mm respectively.  They are available for speeds of up to 10,000 min-1.

The placement process requires strong dynamic activity and positioning accuracy

Printed circuit boards as carriers of electronic components are now part of almost every electronic device. The electronic components are usually attached to the PCB by means of a soldering process. Due to growing large-scale production, especially in the automotive sector, so-called press-in techniques are increasingly being used instead of soldering. Components are fastened by means of connection pins, which are pressed at high speed into metal holes in the PCB. This “press-fit connection” creates a conductive contact. In the process, in just one of these placement systems, as many as 18,000 of these pins are precisely positioned and pressed into the contact holes provided. Placed on a rolled-up tape, they are conveyed to their exact position to be further processed by two placement heads working in parallel. For the high-precision positioning required for the placement process, a servo motor and ball screw work in the XY axis in conjunction with a Servoflex coupling type SFC 035D. To successfully perform high-precision work processes, the double-cardan servo multi-disc coupling combines high torsional stiffness with the required universal displacement capacity. The low rotational inertia inherent to the Servoflex coupling fosters high output in the system, which works dynamically within a continuous acceleration and stopping reverse process.
It operates 24/7 and is only switched off when the tape is changed or when flexible conversion to a new placement process with alternative pin sizes and formats is carried out.