Abstract: A method for dressing a multi-thread grinding worm for the grinding of toothings, wherein the grinding worm includes a plurality of worm threads that are each dressed by a dressing tool with at least one dressing stroke to provide the grinding worm with a desired profile. The method includes: a) dressing a first worm thread, wherein at least one process parameter is measured and recorded during the dressing process; b) dressing a further worm thread, wherein the process parameter is measured and recorded during the dressing process; c) after dressing all worm threads: combining the recorded data of the process parameter; d) comparing the combined data of the process parameter with data stored in a machine controller and checking whether the combined data are within a predefined admissible range; e) outputting a signal if the combined data are not within the predefined admissible range.

Abstract: A method for monitoring the condition of a hard finishing machine, in particular a grinding machine, wherein the hard finishing machine has a number of NC-controlled axes which are actuated during the machining of a workpiece, wherein, for the purpose of evaluating the condition of the hard finishing machine, at least one reference run is performed on at least one axis, during which the response of the axis to a drive signal is measured and evaluated. In order to enable improved condition monitoring of the hard finishing machine, the reference run includes a phase in which the axis is accelerated and/or braked.

Abstract: A hard finishing machine for machining workpieces with at least one gearing, in particular a gear grinding machine, including a spindle rotated by a motor, wherein the spindle has, at a first axial position, a first sensor system for detecting rotation of the spindle at the first axial position, wherein the first sensor system is connected to a control unit for controlling rotation of the spindle. A second sensor system is arranged at a second axial position of the spindle, which is designed to detect rotation of the spindle at the second axial position, wherein the second sensor system is connected to a measuring device, wherein a further sensor system is arranged at the first axial position of the spindle, which is designed to detect rotation of the spindle at the first axial position and is also connected to the measuring device.

Abstract: A method for hard-finishing a workpiece on a hard-finishing machine, wherein the hard-finishing machine has a number of machine axes. The workpiece is received on a workpiece spindle and is machined by a tool received on a tool spindle. During a temporal segment of the machining phase in which the tool is not in engagement with the workpiece, a test run is carried out on at least one machine axis. The machine axis is driven during the test run. A value is specified for at least one drive parameter for which a nominal value of the movement of the machine axis is expected. The actual value of the movement of the machine axis is detected, a comparison between the nominal value and the actual value is carried out by a monitoring device, and a signal is output by the monitoring device if the difference between the nominal value and the actual value lies outside an admissible range.

Abstract: A method for grinding a toothing of a workpiece with a grinding tool in a grinding machine, wherein during the engagement of the grinding tool in the toothing to be ground, a first and a second machine parameter are measured, and both machine parameters measured are compared with a predefined stored value, wherein a signal is output if at least one of the machine parameters exceeds or falls below the predefined stored value, taking account of a tolerance range. To enable a conclusion to be drawn about the course of the grinding process by monitoring relevant variables, at least one of the machine parameters contains periodic signal components, wherein the signal components are broken down by a frequency analysis into the individual frequency components and the frequency components are used, with regard to their frequency and/or amplitude, for comparison.

Abstract: A method for dressing a multi-thread grinding worm for the grinding of toothings, wherein the grinding worm includes a plurality of worm threads that are each dressed by a dressing tool with at least one dressing stroke to provide the grinding worm with a desired profile. The method includes: a) dressing a first worm thread, wherein at least one process parameter is measured and recorded during the dressing process; b) dressing a further worm thread, wherein the process parameter is measured and recorded during the dressing process; c) after dressing all worm threads: combining the recorded data of the process parameter; d) comparing the combined data of the process parameter with data stored in a machine controller and checking whether the combined data are within a predefined admissible range; e) outputting a signal if the combined data are not within the predefined admissible range.

Abstract: Apparatus for batch processing source material into charcoal in a battery of kilns, each of which use forced convection of process gases through the source material to shorten the process cycle time, and all of which use an external combustor to burn the process waste gases from each kiln to provide the primary source of applied energy for the process.