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NAJ VII - Cutting tool grinding machines

Tooth grinding on circular sawblades

High-quality circular sawblades have a long service life, permit high feed rates and ensure great cutting quality. The decisive factors here are the material type and precise tooth grinding finish. This is why, as a ‘partner for precision’, JUNKER offers three machines for grinding peripheral toothing which guarantee not only perfect quality but also high productivity.

Grinding task: Tooth grinding


  • Grinding in package clamping
  • Short cycle time
  • Grinding of all tooth profiles with identical and non-identical tooth height
  • Runout< 0.03 mm

Grinding process descriptions

Tooth grinding on circular sawblades NAJ VII: dia. 100 – 550 mm

These special machines grind the peripheral toothing of circular saw blades in package clamping. All technical tooth profiles, with identical or non-identical tooth heights, are ground from solid blanks. The oscillating longitudinal grinding process guarantees the production of high-grade circular saw blades with excellent runout.

Tooth grinding on circular sawblades NAJ VII: dia. 100 – 550 mm

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Technical data: NAJ VII VIIa

Grinding Length
200 mm
Clamping Length
200 mm
Grinding Wheel Diameter
350 mm

Wheelhead NAJ VII VIIa

  • /10
  • /10i
  • /17
  • /20
  • /50

Technical data: NAJ VII VII

Grinding Length
200 mm
Clamping Length
200 mm
Grinding Wheel Diameter
400-350 mm

Equipment and Options

Control system

The Erwin Junker Operator Panel was specifically developed to control grinding machines. All machine components are controlled using the operator panel – irrespective of the series and the used control system. The identical structure, intuitive menu guidance and visualization of the workpiece geometry make for extreme user convenience and flexibility in operation. Programming takes place directly using the operator panel or an external programming tool.

Loading systems

JUNKER offers both internal and external loading systems for all its machine series, depending on customer and workpiece requirements. The loading systems can be combined with different infeed and discharge systems such as conveyor belts or custom tailored systems.

Measurement systems

The measurement systems are also individually adjusted to the various workpieces and customer specifications. The measurement processes entail evaluating the recorded measured values and utilizing them for measurement correction in line with the prepared measurement strategy. A grinding wheel measuring system to determine the diameter, axial position and width of the grinding wheel completes the wide range of systems on offer.

Dressing unit

Grinding wheel dressing is CNC controlled. A driven diamond dressing wheel or a workpiece-dependent diamond profile roller can be used. Dressing takes place manually or using an automatic dressing program with grinding wheel compensation.


Depending on the application, the abrasive CBN or diamond is used. The basic bodies of the grinding wheels comprise steel or carbon. In conjunction with CBN, it can make sense to use a carbon base body: It is light, has vibration-damping properties and remains dimensionally stable even at high speeds.

Machine bed - mineral cast

The machine bed made of mineral cast provides impressive damping behavior and torsional rigidity. The temperature stability allows fluctuations in the ambient temperature to be compensated with a minimum of effort, ensuring a high level of dimensional stability throughout the whole day.

Fire protection and LTA air filters

In case of an fire, the machine interior is automatically hermetically sealed, suffocating a fire before it has a chance to spread. If required, extinguishers (CO² or water mist systems) and exhaust air purification systems can be additionally installed. A competent partner for fire protection and filtration solution solutions is LTA Lufttechnik GmbH, which also belongs to the JUNKER Group and which researches, develops and produces filtration systems for industrial air purification.

The Filtration systems


  • Saw blades
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