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Dental millers

Constantine has wisdom teeth

The firmJekran builds machines for cutting stone and composite slabs, and uses a special pump system of its own construction. The large size of the machine imposes high rapid speeds, the movement of the beam with two synchronized motors and the need to reduce axis homing times.

The use of the high pressure water jet poses several problems of taper compensation and beam deflection.

The processes are defined by a CAM specialized in complex processes and able to make the most of the cutting technology with water.

All our experience with these machines:

  • Dental milling machines with 5 degrees of freedom with single-pod tilting table of the blank, with possible automatic loader of the associated material.
  • 5-degree-of-freedom dental milling machines with milling-lathe configuration with multiple pod housing for unmanned intensive production operations.
  • Automatic tool change with tray or rotary disk, with measurement of the length and integrity of the tool.

CNC architecture

  • PC-based solution: a single hardware containing the CNC together with the operator interface with separate and independent resources, to increase the reliability and keep the costs of the solution low.
  • Remote modules and servo motors connected via EtherCAT field bus: a single cable connects and integrates all the devices.

Main CNC features

  • ISO6983 standard machining syntax, which facilitates integration with CAMs.
  • Controlled jerk movements for all axes involved in the movement and separately for the tool tip, to avoid mechanical stress and obtain the best finishing surface
  • TCP functionality: allows you to program the machining path of the tool tip and the position of the rotary axes. All the inevitable variations in kinematics compared to the ideal model due to mechanical assembly are compensated by the CNC, so that the same machining program performed on different machines produces the same result.
  • Management of tilting table kinematics and milling lathe.
  • High processing speed (HSM): allows to balance precision and processing time, and to keep repeatability to the maximum. CNC keeps the trajectory of the tool tip within a set threshold, and variable according to the current machining phase.
  • Tool withdrawal from the material safely in the current arbitrary direction of the tool, in the event of a machining suspension command.
  • Management of sister tools: the CNC manages the tool life time and selects the valid tool from the compatible ones.
  • Periodic measurement of tool integrity: in the event of an anomaly on unattended machines, the CNC loads an intact sister tool and resumes machining from the last successful check.
  • Fast Drive Replacement (FDR) functionality: the CNC contains all the parameters of drives, inverters and all other intelligent remote devices, so that they can be easily replaced and calibrated.

Industry 4.0

  • Complete diagnostics through the recording of machine events that can also be analyzed remotely 
  • Measurement of motor absorption, following error and all other relevant data for predictive maintenance available on the CNC.
  • Integrated OPC UA server that exposes productivity data, the current status of the machine to a line supervisor, and allows remote control.

PLC logic environment

  • Powerful PLC environment compliant with the IEC61131 standard: they allow the customization of the application independently by the OEM customer or the system integrator.
  • Extensive application libraries, continuously updated and expanded: allow a continuous and simple improvement of many machine projects at the same time.
  • Compatibility with third party components: facilitates integration with loaders or other auxiliary devices to the machine.

Digital Twin

  • Interpretation of the machining program with the same motor present in the CNC.
  • Simulation of machining on the machine with verification of any mechanical interference, including pneumatic and auxiliary movements.
  • Simulation of the removal of the material with verification of compliance with the finished model, of the processing technological constraints, and with identification of the unmachined parts.
  • Accurate prediction of machining times, and calculation of the residual time of a machining when connected to a real CNC.
  • Integration with the data present in the CAM.

Company with certified quality system UNI EN ISO9001:2008

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