Fig. 12. Wear flat analysis program included in GREAT. Finally, the temperature is one of the handicaps during grinding. Moreover, the temperature measurement during the process is too difficult due to the rotary movement of the grinding wheels and the inaccessible contact between grinding wheel and the workpiece. The access with thermocouples, two color pyrometers or thermo graphic camera is too difficult. Thus, in order to measure contact temperature as accurate as possible an advanced device and sensor have been developed carrying out the project entitled ‘Advanced device development for the measurement of grinding temperatures’. Developed device consists of a silica fiber inserted in the workpiece. The configuration of temperature measurement device is shown in Figure 13. RESEARCH AND INNOVATION the wheel-workpiece pair totally determined. As well as the grin- ding performance, wheel wear generated during the test will be characterized too. Additionally, a Python program is developed for the analysis of wear flat generation, as it is shown in figure 12. This program is also included in GREAT application. From this study it is determined that higher specific energy correspond to less aggres- sive process, both for surface and cylindrical tests. Moreover, G-ratio is higher for lower depth of cut and lower cutting speed and higher workpiece speed. Finally, it is important to note the possibi- lity of extrapolating the same characterization system to any other wheel-workpiece pair to be analyzed. Customized solutions for specific industrial problems The last research line is constituted for different industrial pro- blems which require customized solution. The two last projects carried out are related with cylindrical workpiece clamping and with ultra-sonic assisted dressing process. On the one hand, the project ‘Theoretical and experimental study of workpiece clam- ping conditions by friction during cylindrical grinding’ is developed in order to study the possibility of grinding without using a lathe dog, which has certain drawbacks, such as the impossibility of ground a complete workpiece at the same time. To this end, theo- retical and numerical analysis of limiting torque is carried out using Q’w as the representative parameter for these limits, since it is a good indicator of the aggressiveness of the process. In figure 14 the differences between theoretical and experimental torque evolution depending on the pressure between centers in a cylin- drical grinding machine are shown. The real maximum value of the specific material removal rate is obtained. After this value, the workpiece slides between centers. Fig. 14. Theoretical and experimental torque results. On the other hand the project ‘Study of ultra-sonic assisted dres- sing process’ is carried out in order to analyze the differences between conventional ultrasonic-assisted devices implemented on dressing process, this configuration is shown in Figure 15. The companies wanted to know the real improvements on grinding quality dressing with ultrasonic-assisted dresser (UAD). Thus in this work alumina grinding wheel is dressed using conventional and UAD in order to compare grinding results. To this end, ultrasonic- assisted dressing is characterized analyzing grinding forces and power consumption during grinding. Moreover, grinding wheel wear is also analyzed using G-ratio parameter. Finally, the wear of a single point dresser is characterized, analyzing worn area and worn volume, comparing UAD and conventional dressing processes. 17 Fig.13. Temperature measurement device performance.