Influence Of Relative Humidity And Air Temperature On The Stopping Position Of The Automatic Tool Changer In A Cnc Machine When Using A Pneumatic Cylinder

The automatic tool changer (ATC) in computerized numerical control (CNC) milling machine often uses pneumatic dynamic sources. Friction in the pneumatic cylinder affects the ATC's stopping position; this friction depends on many factors, including the air environment's relative humidity and temperature. This paper presents the results of research on the effects of relative humidity (RH) and air temperature (T) on the stopping position of an ATC using a pneumatic cylinder. Studies were conducted at temperatures of 15 degrees C, 32 degrees C and 49 degrees C and relative humidity values of 51%, 75% and 99% for different speeds of the pneumatic cylinder (30, 50 and 100 mm/s). The results show that when the humidity increases from 51% to 99% and the temperature increases from 15 degrees C to 49 degrees C, the friction force decreases. The friction force is related to the relative humidity and temperature of the air. Thus, the deviation of the ATC's stopping position depends on the relative humidity and temperature of the area under investigation.