A growing part of our ETP business is in the continuous development programme, where ETP products can be adapted to be a legitimate advantage in bespoke applications.
The scientist Blaise Pascal formulated the principle of pressure propagation in liquids many years ago: Pascal's law or the principle of transmission of fluid-pressure states that , ”pressure exerted anywhere in a confined incompressible fluid is transmitted equally in all directions throughout the fluid such that the pressure ratio (initial difference) remains the same”.
The ETP product utilises the many positive qualities of this principle and has continued to develop it further so that it can be utilised reliably and accurately within industrial applications.
All ETP products consist of a double-walled hardened steel (in some cases stainless steel) sleeve, filled with a pressure medium. In the product flange there are one or more screws and a piston with seals for the pressure setting. When the pressure screw is tightened an even and moderately high surface pressure is created against the shaft and hub, causing the locking effect. The self-contained product allows this procedure to be repeated many times.
Whether the hubs are to be removed or repositioned, mounting and dismantling is done in less than a few seconds. The hydraulic principle gives immediate advantages for today´s modern machines. The compact designs also ensure better concentricity and balance at increased machine speeds, shorter downtime for service and increased precision.
Using the wealth of product and expert engineering knowledge has resulted in the integration of the ETP product principle into many new and interesting applications. In short we are able to offer customised solutions in co-operation with OEM’s. This can be from a small adaptation to a standard part right through to completely bespoke designs that turn your your clamping challenges into innovative and reliable solutions.
ETP-UNIGRIP - A unique development in clamping
An excellent example of our specialist capability is displayed in the development of the axial tensioner ETP-UNIGRIP which was developed to be used within a packaging machine. The application was to secure circular cutting knives which where originally held in place with spacers and multi-bolt mechanical shaft clamping devices. The mechanical method employed prior to the ETP UNIGRIP was both incredibly time consuming and required a high degree of skilled maintenance to ensure correct cutting blade position.
The ETP-UNIGRIP was developed to expand three pins axially on the flank of the spacer to ensure continuous axial clamping against a shoulder. The amount of axial movement and force could be accurately adjusted by the rotation of one easily accessed cap screw, whilst another cap screw, again easily accessed, was employed to instigate the shaft clamping, much in a familiar fashion to the standard product ranges, such as the ETP EXPRESS. The integral hydraulic system also reliably delivered an evenly distributed force between the three pistons, offering accurate axial force clamping. The final design therefore used two clamping systems consisting of a hardened steel body with an inner sleeve, three axial pistons with seals and two pressure screws, all in the single piece construction.
Further models have now also been developed that have an internally threaded bore that does not expand and are equipped with with larger, higher force axial thrust pins, with longer piston stroke. The product can also be made to other dimensions on request.
We will be pleased to hear from you regarding your clamping challenges. Please ask for Peter on 01386 421005