Virtual Sensor for Calibration of Thermal Models of Machine Tools

Table 1

Directly measurable variables.

#	Variable	Description
1	, °C	Air temperature outside the machine
6	, °C	Temperature of the bearing chassis
8	, °C	Temperature of the cooling water in bearing chassis
9	, °C	Outer bearing temperature
11	, °C	Spindle flange temperature
13	, °C	Motor temperature
14	, °C	Motor chassis temperature
15	, N	Spindle preload force
16	, Nm	Spindle beam in bending moment
17	, Nm	Motor moment
18	, rpm	Motor speed