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Interview on linear axes

Mara Hofacker,

"The Movitec series is precisely designed for the special"

Dr. Tretter presented its comprehensive range of machine elements at Motek 2019 in Stuttgart. The Swabian manufacturer, quality supplier and technology partner focused on its extensive range of linear axes - including the Movitec product line. Rainer Ott, Product Manager at Dr. Tretter, explains what this series is all about and how designers can benefit from it.

At Motek, Dr. Tretter focused on its range of linear axes. © Dr. Tretter

Mr. Ott, at Motek, Dr. Tretter presented the Movitec product line, among others. What makes these linear axes so special, and in which applications should the designer use them?

Rainer Ott, Product Manager at Dr. Tretter. © Dr. Tretter

Efficient assembly and handling technology is required to transport parts quickly in and out of systems and to feed them precisely to further processing steps. With our standardized linear units from the Movitech series, extremely economical positioning systems can be implemented on a customer-specific basis. We offer the linear axes from the modular system in various sizes and designs. The different lengths serve as a guide. Customers receive spindle axes in lengths of up to three meters and toothed belt axes in lengths of up to six meters. We also adapt the components to customer requirements if necessary. Depending on the application, load and required rigidity, the systems are set backlash-free or preloaded.

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Movitec linear axes are efficient and cost-effective solutions for moving medium loads reliably. How does Dr. Tretter implement this?

Over the years, we have acquired a wealth of experience and know-how. This enables us to precisely analyze customer-specific tasks and deliver a tailor-made solution on this basis. Thanks to the modular design of the standard components, application-oriented linear systems can be realized at extremely economical conditions.

In which variants does Dr. Tretter offer these linear units?

Depending on the application and task, we offer various spindle and toothed belt drives or pneumatically driven axes. All our linear units are also available without a drive as an option. We also offer a wide range of different guide systems. Depending on the application, customers can then use standardized connecting elements to quickly and cost-effectively assemble our sophisticated linear axes into single, dual or multi-axis positioning systems. Processes can thus be made considerably more efficient.

Can you name typical applications in which this series is used, and what task do the components perform in each case?

Our Movitec series is suitable for a wide variety of tasks. In one specific application, for example, the components are used in tool carriers to precisely position transmission parts and feed them to the assembly unit. At another customer, they transport valve covers very precisely for further processing. The linear units are also used in packaging systems for pick-and-place tasks, in laser cutting systems for workpiece handling or in the semiconductor industry to load pallets with components.

The lightweight and robust linear units in the Movitec product line enable the construction of sturdy and rigid gantries - without additional structures. © Dr. Tretter

How do you respond to special customer requirements, for example if the application cannot be implemented using the modular system?

The design and production of the Movitec series is precisely tailored to special requirements. For example, we can quickly produce linear units with special lengths, special surface treatments or with customer attachments. We design the linear axes to suit the application - for example, if they are used in foundries and need to be particularly robust or if very high precision is required for PCB assembly.

What direction is your further development of these components heading in, and what advantages will machine manufacturers benefit from?

We consistently continue to optimize the components. This applies in particular to their mechanical properties and cost-effectiveness. The aim is to be able to offer the customer a linear unit or multi-axis system that is perfectly dimensioned for their task - and at attractive conditions in terms of price and delivery time.

You presented trapezoidal screw drives for the first time in Stuttgart. Why did you include these components in your range?

More and more customers approached us and asked for these components. And the trapezoidal screws complement our wide-ranging product portfolio very well. In certain applications, they can be an economical alternative to the more expensive and more precise ball screws. Trapezoidal screws consist of the trapezoidal screw spindle and a trapezoidal screw nut. High strength can be achieved by rolling the trapezoidal screw spindle. If the thread flanks also have a high surface quality, the unit achieves exceptionally good running properties. They also require less installation space. Our trapezoidal screw drives are manufactured exclusively in Germany. This enables us to ensure short delivery times.

How specifically can you respond to your customers' applications?

We cover a wide range of diameters and pitches with our trapezoidal screw drives. We machine the ends of the rods according to customer drawings. The maximum length that we manufacture is six meters. With butt joints, users can assemble the shafts to any length beyond six meters. Our expertise lies primarily in the cost-effective machining of small and medium quantities. Our customers particularly appreciate the fact that we can also offer prompt processing of shafts for very small quantities and individual parts. We have eight highly flexible lathes and three milling machines at our disposal for this purpose. We are also able to supply special materials and surface treatments at any time.

Where can they ideally be used?

This is just as broadly diversified as the linear units. They are often used for machine tools in CNC technology. They are also used in feed, automation and handling units. However, designers also use them efficiently for manual adjustment units.

How important is Motek for Dr. Tretter?

Motek is a very important trade fair for us, perhaps even the most important. This is because the majority of our customers are based in Baden-Württemberg. And with its location in Stuttgart, it is right in the middle of our catchment area. Of course, this also has to do with the fact that medium-sized special machine manufacturers are very strong here in the region. At the trade fair, we meet both existing and many potential customers. The quality of the discussions is very good. We always make exciting contacts.

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