圆上海支通大峰 Applications 0 7 方 w a ) Jack Press machine lathe 上泽充通大学 Objective of this Lecture Learn to analyze power screws and to specify suitable sizes for a given application Describe the operation of a power screw and the general form of square threads,Acme threads,and buttress threads as they are applied to power screws. >Compute the torque that must be applied to a power screw to raise or lower a load Compute the efficiency of power screws >Compute the power required to drive a power screw >Analyze the failure modes Screw mounting(How are they fastened to other machine parts?) >7 Applications Jack Press machine lathe Objective of this Lecture Learn to analyze power screws and to specify suitable sizes for a given application  Describe the operation of a power screw and the general form of square threads, Acme threads, and buttress threads as they are applied to power screws.  Compute the torque that must be applied to a power screw to raise or lower a load  Compute the efficiency of power screws  Compute the power required to drive a power screw  Analyze the failure modes  Screw mounting( How are they fastened to other machine parts?)