Machine drift compensation

ProcessControl - Automatic machine drift compensation
This is a new concept from Rollomatic to increase the reliability and stability of the production grinding process of cutting tools. The goals were to alleviate deviation in grinding performance to improve productivity, reduce scrap to almost zero and enable unattended production.
A Renishaw probe tip is mounted to the X-axis slide. The Renishaw probe on the machine will travel to this probe tip in regular, pre-programmed intervals in order to compare the machine drift in 3 dimensions.
The origin of deviation during unattended grinding is generally found in two places: external and internal. External influences stem from temperature variations in the coolant oil, and from ambient temperature changes. Internal effects come from thermal expansion, grinding wheel condition and grinding wheel wear. The major part of this new concept is to measure the axis drift on the 3 liner axes during tool production and use an intelligent SPC system to analyze the data and make appropriate software correction based on an intelligent mathematical principle. Generally, the diameter tolerance band on high-precision endmills can be halved with this system.



