WMechanism (engineering)
WAnti-twister mechanism
WBall differential
WBallast
WCable robots
WCam
WCam timer
WCentrifugal governor
WClockwork
WColor wheel (optics)
WCoupling
WCrayford focuser
WDifferential (mechanical device)
WDifferential pulley
WDifferential screw
WFloat switch
WGear train
WGeneva drive
WGimbal
WHoberman mechanism
WHydristor
WJackscrew
WKentledge
WKinematic chain
WKinematic diagram
WLever
WLinkage (mechanical)
WLock time
WMecanum wheel
WMechanical arm
WPawl
WPendulum-and-hydrostat control
WPercussion cap
WPropeller speed reduction unit
WQuick return mechanism
WQuill drive
WRailroad switch
WRatchet (device)
WRecirculating ball
WRemote Center Compliance
WRube Goldberg machine
WScissors mechanism
WSki binding
WSolenoid valve
WSteering column
WStewart platform
WTorque multiplier
WTrammel of Archimedes
WTransmission (mechanics)
WTreadmill
WTrigger (firearms)
WTrunnion
WUniversal joint
WWinch
WWindlass