Abstract The distinguishing feature of a vertical ball screw feed system without counterweight is that the spindle weight directly acts on kinematic joints. Research into dynamic characteristics under acceleration and deceleration an important step in improving structural performance milling machines. magnitude direction inertial force change significantly when accelerates decelerates. Therefor...

PURPOSE Many different attachment systems (eg, bars, studs, magnets, telescopic copings) have been used to retain overdentures. The current study aimed to investigate the load transfer characteristics and to compare the stress levels of four attachment designs for mandibular overdentures retained by one central implant and two inclined distal implants. MATERIALS AND METHODS Photoelastic mandi...

Being a critical factor affecting the motion accuracy of precision machine tools, structural thermal elongation ball screw unit is generally caused by comprehensive influence from heat generations screw-nut pair/bearings and time-varying ambient temperature. To resist 2 disturbances above to guarantee precisely original length shaft, an active coolant control strategy proposed in this paper. Th...