Page 18 of Ball Screws by RBC Bearings

5.5 precautions for screw design 5.5.1 thread runoff adjacent diameter the following considerations should be given to ensure an economical design for your ball screw application the ball thread runoff must extend off one end of the screw shaft for the following ball nut models this is to facilitate the loading of the ball nut package a internal deflector type b yoke deflector type c flange/base mount housing type 5.5.2 hardness/transition zone rbc s ball screw shaft is induction hardened thus an incompletely hardened zone may be present at each end of the screw thread area depending on the design please consider this when designing the effective stroke consult rbc for details 6 nut design 6.1 nut selection 6.1.1 series the required accuracy delivery size and ball nut style must be considered when selecting the proper series for your application 6.1.2 ball re-circulation type select the ball re-circulation type according to the ball nut mounting and application standard external return tube type · suitable for large lead screw shaft diameter ratio ball deflector type · compact ball nut outside diameter · suitable for small lead/shaft outside diameter ratio 18

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