▁no ▁phase ▁shift ▁between ▁sh aft s . ▁ ▁The ▁constant - vel ocity ▁relationship ▁between ▁input ▁and ▁output ▁sh aft s ▁joined ▁by ▁a ▁Schmidt ▁coupling ▁is ▁una ffect ed ▁by ▁changes ▁in ▁radial ▁disp lacement . ▁This ▁relationship ▁is ▁similarly ▁una ffect ed ▁by ▁initial ▁radial ▁reaction ▁forces ▁which ▁could ▁otherwise ▁im bal ance ▁the ▁system . ▁ ▁Schmidt ▁cou pl ings ▁maintain ▁constant ▁velocity ▁between ▁the ▁input ▁and ▁output ▁sh aft s ▁while ▁the ▁sh aft s ▁under go ▁radial ▁sh ifts ▁in ▁their ▁relative ▁positions . ▁ ▁Schmidt ▁coupling ▁types ▁▁ ▁Schmidt ▁cou pl ings ▁have ▁been ▁ref ined ▁to ▁come ▁in ▁several ▁coupling ▁designs , ▁including ▁the ▁following : ▁ ▁* ▁Schmidt ▁Off set ▁Cou pl ings : ▁Schmidt ▁cou pl ings ▁which ▁transmit ▁constant ▁angular ▁velocity ▁and ▁tor que ▁in ▁a ▁wide ▁range ▁of ▁parallel ▁sh aft ▁mis align ment . ▁ ▁* ▁Sem i ▁flex ▁Cou pl ings : ▁Sem if lex ▁coupling ▁ ▁is ▁a ▁t ors ion ally ▁st iff ▁and ▁rest oring - force - free ▁precision ▁coupling . ▁In ▁addition ▁to ▁the ▁compens ation ▁of ▁ax ial ▁and ▁angular ▁disp lac ements , ▁it ▁provides ▁high ▁radial ▁disp lacement ▁capacity ▁together ▁with ▁compact ▁design ▁ ▁* ▁Schmidt ▁In line ▁Cou pl ings : ▁Schmidt ▁cou pl ings ▁which ▁accommod ate ▁small ▁parallel ▁sh aft ▁mis align ment ▁at ▁constant ▁angular ▁velocity . ▁ ▁* ▁Control ▁flex ▁Cou pl ings : Control ▁flex ▁is ▁a ▁precision ▁coupling ▁designed ▁to ▁meet ▁the ▁mechanical ▁and