Chart 15-31 Shown as Machining of mechanical parts Clearance elimination method of key connection 。

　　 About Good machining plant Speaking ， In the transmission of CNC machine tools ， The fit clearance between gear and shaft key will affect the machine tool Hardware processing Accuracy ， The gap must be eliminated. 。

　　 Chart 15-31（a） Shown as Double bond connection structure ， Remove the gap with the set screw 。

　　 Chart 15-31（b） Shown as Wedge pin connection structure ， Tighten with nut to eliminate clearance 。

　　 Chart 15-32 Shown as Keyless connection 。

　　 Keyless connection structure of gapless transmission ： Piece 4 And 5 It is a pair of elastic conical expansion sleeve with good contact ， Tighten the ring 2 And 3 When pressing them ， Inner elastic conical expansion sleeve 4 Reduction of inner hole of ， External elastic conical expansion sleeve 5 The outer circle of ， Drive by friction Piece 6 And Axis 1 Come together 。 The number of conical expansion sleeve is determined according to the torque required to be transmitted ， Can be one or more pairs 。