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Cross feed devices with push/pull rod (U axis) for actuating tools

For contour and lathe machining of cubic workpieces!

Facing units from the SEMA component shop

SEMA Machine Tools offers the right cross feed device for actuating tools and facing slides, with a freely programmable, rotary driven axis system (U axis).

Used for:

  • Facing head / facing slide
  • Actuating tool / slide tool

The applications range from pre-machining to fully machined complex contours. Actuating tools open up high streamlining and optimisation potential for machine tools. The same tool can be used for a wide range of operations, for example eliminating the need for various form cutters for complex internal contours. Another advantage is the elimination of lathing, which improves productivity and profitability.

Cross Feed Devices

For actuating tools and facing slides, the translational movement of the push/pull rod is redirected into radial or inclined actuating movements by the mechanical elements of the slide drive. 

Rotary bar drive

Cross feed devices from the SEMA component shop

If the maximum force arising for a system with push/pull rod is too high, the unit is coupled with a rotary bar drive. A rotary bar driven by an additional motor is situated in the main drive spindle. If both rotational speeds are identical, the tool position on the facing slide does not change. If a rotational speed difference arises, e.g. due to a reduction in the revolutions per minute at the rotary bar motor, the tool position changes.

The performance of the cross feed device must be sufficiently dimensioned to ensure that the tensile or rotational force is dependent on the speed and stroke. Thanks to many implemented applications and the resulting know-how, SEMA Machine Tools is the ideal partner for the use and implementation of actuating tools or facing slides.

Mechatronic facing slide

Mechatronic cross feed devices from the SEMA component shop

Mechatronic facing slides are also used on machine tools from SEMA. Mapal offers the system TOOLTRONIC®, and the manufacturer KOMET offers the KomTronic®. SEMA Machine Tools is familiar with both systems and has used them both successfully.


  • Grooving
  • Facing
  • Contour turning, outside and inside
  • Wear compensation


  • Reduced machining time:

    - Fewer tool changes

    - No time-consuming circular machining

    - Complete machining on one machine

  • Reduced number of tools
  • Complete machining on one machine tool without rotation
  • Lower power demand thanks to U axis systems
  • Low investment costs
  • Relatively low operating costs


  • Sturdy construction for all applications
  • CNC or hydraulically controlled facing head
  • Facing heads with automatic tool changing possible
  • Rotational speed range up to 8,000 rpm, or more on request
  • Standard drive output up to 50 kW, or more on request
  • Labyrinth seal with sealing air connection
  • Variable belt box and feed drive positioning
  • Variable drive transmission ratio
  • Central lubrication connection for the feed drive of the facing head
  • Internal lubricant supply for automatic lubrication of the facing head possible

Spindle unit with push/pull rod for contour machining and lathing

Spindle unit with push/pull rod SEMA PDE-G - housing

  • Fastening of the spindle unit via housing facing down

Spindle unit with push/pull rod SEMA PDE-F - flange

  • Fastening of the facing unit via flange