Page 210 - The Tribology Handbook
P. 210

B9                                       Screws













































                            10
                               0                                                                   120
                                                         SCREW DIAMETER mrn

                       Figure 9.2  The maximum unsupported length of screw, with one end free, to avoid buckling


                 Installation

                 The  performance  of  all  screws  will  be  reduced  when
                 subject to  misalignment  and sideways  loads. Ball  screws
                 are particularly sensitive to these effects.
                   All screws require lubrication, either by  regular greas-
                 ing or by  operation within  an enclosure with oil or fluid
                 grease.
                   For  precision  installations  the  screws  and  nuts  need
                 protection  from  external  contamination  and flexible  con-
                 voluted  gaiters are commonly  used for their protection.

















                                                              B9.3
   205   206   207   208   209   210   211   212   213   214   215