44 Cross Park Avenue

North Kingstown, RI 02852


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44 Cross Park Avenue

North Kingstown, RI 02852


Stream Finishing Machines

stream finishing units


SF technology, also known as stream finishing, gives rise to an innovative new generation of mass finishing machines.  In this process, the workpieces are clamped in a holder and lowered into a rotating container filled with a grinding or polishing medium.  The actual finishing motion is generated by the grinding or polishing medium flowing around the workpiece and in addition by the independent rotation of the workpiece itself. This enables surfaces with values of Ra 0.01 to be obtained, even in the smallest chip flutes. The SF process offers very short finishing times, is easy to automate and at the same time produces highly consistent and reliable results.

The differences to other technologies lie in the tremendous processing forces harnessed by the machine. This enables material to be removed more selectively and faster than with any other surface finishing system.  The SF was specially designed for applications for which no satisfactory process previously existed, and specifically for applications which call for the highest possible surface qualities in the smallest of geometries. It fulfills the requirements of a wide range of finishing tasks from deburring and mirror-finish polishing to smoothing and polishing, as well as the edge rounding of cutting tools.

The SF machines are especially suitable for the finishing of stamping, forming and cutting tools, for finishing components in the automotive sector and for achieving perfect surfaces in the aerospace industry.

Stream finishing units can optionally be equipped with PULSE FINISHING technology. The principle of the new PULSE FINISHING process is based on the precisely defined and rapidly alternating relative motion between media and workpiece. This patented pulse drive was specially developed for the requirements of the automotive sector and the modern toolmaking industry. The PULSE FINISHING process enables the extreme requirements of large-scale series production to be consistently met in terms of process reliability, speed and finishing quality. For example, it is possible to deburr, round and smooth surfaces from Rpk 0.2 μm to Rpk 0.1μm in less than a minute and in a single processing stage. This achieved without adversely affecting the contours of the workpiece.

  • Fully automatic process
  • Precisely programmed motion cycles
  • Can be integrated into the production line
  • Several processes in a single processing stage



Stream finishing machines, optionally with pulse finishing, for manual loading of workpieces; suitable, among other purposes, for small-series production and for production lines without predefined cycle times.

OTEC Presentation Toolmaking Industry_EN


Stream finishing machines, optionally with pulse finishing, for automatic loading of workpieces; suitable, among other purposes, for production lines with predefined cycle times. Ready-equipped for automatic loading or optionally with integrated automatic loading.



The SF-HP is the worlds first and only streamfinishing machine for surface processing of large and heavy workpieces. With the established and reliable DNA of OTEC Streamfinishing series


Newest machine in the Automatic machine series. In the SF-PLS (Prisma Loading System) proven OTEC processes meet simple automation.