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OTEC’s Newest Stream Finishing Machine

OTEC is expanding its SF Series of stream finishing machines, with the addition of the SF-HP model, designed to accommodate larger and heavier workpieces. With its modern and compact design, the SF-HP was developed to round edges, polish, smooth and deburr large workpieces. This innovative machine can be used for applications across a variety of industries including aviation, machinery construction, forming tools, the energy, oil and gas industry, shipbuilding as well as the food industry.

Repeatable high-quality surfaces are guaranteed thanks to OTEC’s proven Streamfinish technology. Our unique, patented pulse finishing process is also integrated in the new SF-HP. Economical processing of large and heavy workpieces is now a reality. 

The new machine can process workpieces that are up to 650mm (25.5906 inches) in diameter and/or length and 200kg (440.925 lbs) in weight. Other features include a simple and intuitive user interface. Additionally, a variety of axis settings for the process head and spindle make almost any flow-through process media of the workpiece surface possible.

Some of the benefits of OTEC’s SF series stream finishing machines include: 

  • High efficiency and short processing times
  • A range of processing options depending on the requirements, including smoothing, high-gloss polishing, edge rounding and deburring.
  • User friendly operation through a multi-touch color display screen
  • Ergonomic machining of large and heavy workpieces through integrated automatic loading. 
  • Simple container changing enables multi step processes using different media. 
  • Improved tribological surface properties, which provide reduced friction and abrasion.
  • The highest surface qualities down to the smallest geometry. 

To see if OTEC’s new SF-HP stream finishing machine is right for you, please submit a sample processing request and we can develop a process specifically designed for your workpieces and applications. 

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Choosing The Right Media And Compounds For Disc Finishing

OTEC Präzisionsfinish GmbH recently hosted a webinar on how to select the best media and compounds for a disc finishing process. The webinar shared some of the benefits of choosing the optimal grinding chips and compounds for your process, including shorter processing times and obtaining the desired results more efficiently. 

The training also provided an overview of the different media that can be used with disc finishing machines, including plastic, ceramic and porcelain grinding chips. Additionally, during the webinar, best practices for choosing the ideal compounds for wet finishing processes were also discussed.

Possible applications for OTEC’s disc finishing machines include: 

  • In medical and pharmaceutical manufacturing, for surgical fasteners, bone screws, bone plates and milled parts, ear molds, dental implants and acrylic teeth.
  • For the automotive industry, in the manufacturing of pieces including gearbox and engine parts. 
  • In the jewelry and watchmaking industries,  for working parts of mechanical watches and polishing gemstones. 

To view this webinar on demand, please reach out to us via our inquiry form.


To see if OTEC can help implement or improve a disc finishing processing for you,  please submit a sample processing request.

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Stream Finishing For Knee Implants

According to WebMD, knee replacement surgery is one of the most common bone surgeries in the United States. As knee replacement surgeries become more common, there is more demand for the artificial joints used for these procedures. OTEC’s stream finishing machines are highly effective for deburring, rounding, smoothing and polishing axially-supported knee prostheses, a frequently-used type of knee implant.

Axially supported prostheses feature two components joined by a stabilizing hinge, with one of the components featuring a box-shaped configuration. Because of this box-shaped structure, finishing these parts can be challenging. Some of the advantages of utilizing OTEC’s stream finishing technology when working with knee implants include: 

  • Uniform surfaces
  • Consistent workpiece quality
  • Process reliability
  • No manual finishing
  • Option to process up to three knee joints in one pass
  • Quick process time 
  • No programming required

Using OTEC’s stream finishing machines, workpieces are clamped together and lowered into a rotating container filled with an abrasive or polishing medium. The workpiece rotates and is processed as the medium circulates around it. Our SF Series 3 Automation Stream Finishing machine can perform multiple processing steps very quickly in a single operation, which means a workpiece can be rapidly deburred, rounded, smoothed and polished in sequence, with no additional workload. 

Because of the unique box shape of stabilized knee implants, OTEC’s stream finishing machines offer two main advantages:  a contour-controlled motion sequence and an adjustable workpiece angle. These features make it possible to target the media flow at specific sections of a workpiece for particularly intensive processing. That translates to effective results in minimal time. Material abrasion can be controlled and it’s also possible to set precise roughness parameters based on the process: with initial work-piece values of Ra 0.8–1.2 µm you can achieve outstandingly smooth target values of up to Ra 0.01 µm.

When processing large volumes of workpieces, short loading and set-up times make operations much more efficient. OTEC’s SF Automation Series machines can be fitted with optional pulse finishing and work well in cyclic production lines. Depending on the requirements, the machines can either be set up for automatic loading or fitted with it as an integrated option. The machine design is modular and therefore easy to adjust to cycle time. Additionally, our SF Automation Series machines can be easily integrated as elements of any production line.

At OTEC, we can deliver the right machine for any surface finishing requirement, along with the ideal abrasive and a customized process. We can adapt and develop specific solutions based on your needs. We’re able to come up with a process based on your samples and ensure it’s reproducible and efficient, with professional documentation for all process technology parameters. 

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Stream Finishing For The Aerospace Industry

OTEC’s stream finishing machines can be a reliable, quick and cost effective alternative to manual finishing for the aerospace industry. Stream finishing can be used with servo valves, which are commonly used in aircraft flight control systems. These valves hydraulically operate aircraft ailerons, rudders and other control surfaces.

OTEC’s SF-Series Stream Finishing Machine

High friction and burr formation among a servo valve’s bushings and spools can lead to abrasion and wear, which can cause the valve to fail. Additionally, sharp or unevenly rounded edges can also impair a valve’s flow. When a servo valve needs to be replaced, it’s very important to guarantee consistency, safety and stability. These replacement parts are frequently post-processed by hand, which can be inefficient and unreliable. Manual processing is subject to human error and can be very time consuming and costly.

Servo valves are electromagnetically operated hydraulic ram valves consisting of a bushing, a spool and an electric control unit. The valve can open or close a variety of hydraulic circuits based on the position of the spool.

However, stream finishing servo valves with a consistent flow of media and strictly monitored parameters guarantees maximum process reliability and repeatability, which means a much lower rejection rate for parts. OTEC’s SF3/3 RLS stream finishing machine with an automatic workpiece loading system can process a component in 40 seconds flat. OTEC machines can pay for themselves in as little as two to three months. The pulse finishing process used with our stream finishing machines reduces cycle time by up to 96% compared to manual processing. Other benefits of OTEC’s high-precision processing include enabling the closest possible tolerance, which is critical for system tightness, and permitting a higher switching or stroke frequency, which significantly increases control accuracy. 

Before (Top) and After (Bottom) Stream Finishing

Pulse finishing, OTEC’s stream finishing innovation, has remained the fastest mass finishing process on the market since it was launched in 2013, with average process times of 60 seconds. Using very small grinding bodies compatible with the process, it produces precise, effective, ultra-consistent results even with complex workpieces. OTEC stream finishing systems are cost-effective, process-oriented solutions that combine easy automation with maximum process reliability.

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How To Get The Perfect Finish on Additively Manufactured Parts

Additive manufacturing, also known as 3-D printing, is becoming more commonplace in industrial manufacturing and a variety of components, ranging from jewelry parts, dental implants, earmolds and engine blades, are all being manufactured through this industrial production method. 

Since the 3-D printing process creates components by adding successive layers, 3-D printed parts have a distinctive surface structure characterized by striations, pores, fissures and cavities, which creates the need to improve their surface quality and  reduce the staircase effect. 

The conventional solutions are manual post-processing, solvent vaporizing, or mass finishing, for example, vibratory tumbling. However, all three of these methods can be very costly and time consuming. Fortunately, OTEC’s disc finishing machines offer a quick and cost-effective alternative when it comes to achieving the perfect finish on additively manufactured components. OTEC’s disc finishing machines produce homogeneous surfaces very quickly, without chemicals, by smoothing and polishing them.

OTEC CF Standard Series disc finishing machine

OTEC’s CF Series disc finishing machines are known for their application flexibility, repeatability and process reliability, which makes them ideal for getting the perfect finish for 3-D printed parts. The CF Series machines have a flexible workflow that allows workpieces and abrasives to be easily changed in each container. Thanks to a modular design, the machine allows you to run different post-processing steps in different containers simultaneously, regardless of whether the workpieces are the same. Additionally, the machine’s control unit lets you store and monitor workpiece-specific process parameters, so you can run them again with the press of a button. 

Compared with vibratory finishing, OTEC’s disc finishing machines have a much higher mechanical abrasion level. For manufacturers of 3-D printed parts, that means shorter process times – by a factor of five to ten. And unlike chemical smoothing, our CF machines do not use harsh chemicals such as solvents. They are safe to handle, simplify workflow and save you time. They’re also affordable to buy and operate, which cuts series production unit costs. 

Our CF Series machines reduce manual rework to the absolute minimum. That largely depends on the application in question and the finishing requirements. Generally speaking, repeatable, reliable mechanical processing with disc finishing cuts the cost of manual work by 80%. Only the final polish – for example with jewelry – needs to be done by hand.

CF processing example: 3-D printed workpiece made by SolidPro, before (left) and after (right) the CF process.
CF processing example: a 3-D printed plastic earmold after the CF process.  

If you need help finishing 3-D printed parts, please send us a sample processing request.

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Finishing Machines For Medical and Pharmaceutical Technology

OTEC USA’s latest webinar highlights different applications for our finishing machines within medical and pharmaceutical technology. 

This training provides an overview of several of our CF Series disc finishing machines, our HV 20 Tub Vibrator and our DF Pharma Series drag finishing machines. Some of the possible applications include use in the production of surgical implants, earmolds and dental implants, among others. 

All of OTEC’s machinery is reliable and cost-effective, while providing precise results.   

To request access to the full on-demand webinar, please contact us via our inquiry form: https://otecusa.com/contact/inquiry-form/