Page 37 - logic
P. 37

USER GUIDE

            American Standard Buttress
            Thread Designations
          •  When only the designation BUTT is used, the     •  Whenever possible this description should be
             thread is a “pull” type buttress (external thread pulls)      confirmed by a simplified view showing thread
             with the clearance flank (45˚) leading and the      angles on the drawing of the product that has
             pressure flank (7˚) following.                     the buttress thread.

          •  When the designation PUSH-BUTT is used, the     •  Always remember that the position of your
             thread is a push type buttress (external thread      holder and direction of your feed will determine
             pushes) with the load flank (7˚) leading and the      the lead angle on the insert.
             45˚ clearance flank following.


             External Buttress (45˚ lead) Thread  Internal Buttress (45˚ lead) Thread  American Standard Buttress
                    Counterclockwise               Counterclockwise            1/2 d  play
                    rotation                       rotation                       nut        P
                                                                                             0,1632 P  0,0627 P
                                                            45˚ clearance flank of this
                                                            buttress thread becomes
                                                            the leading angle in this
                                                            application.                                 0,3 P
                                                                RH bar        0,3 P
                                                                 A_ -FLER  0,8906P
                                                                                                         0,3 P
                                                      feed
                              45˚ clearance angle of this   LH insert
                              buttress thread becomes       45˚ Lead           0,0826 P
                              the leading angle in this     FLTB-2LB                                1/2 d2   play
               chuck          application.    chuck         FLTB-3LB                         45˚
                     RH insert                              FLTB-4LB                    7˚          0,1632 P
                     45˚ Lead                                                     screw
                     FLTB-2RB                                               1/2 d1 play
                     FLTB-3RB   LH holder                 45°
                     FLTB-4RB   FLEL                                              Use: fittings and pipe couplings
                             RH holder
                       feed
                             FLSR
             Feed direction towards the chuck
             External RH Thread  • counterclockwise rotation  Internal RH Thread  • counterclockwise rotation
                         • right-hand toolholder    • right-hand bar
                         • right-hand insert        • left-hand insert




             External LH Thread  • clockwise rotation  Internal LH Thread  • clockwise rotation
                          • left-hand toolholder      • left-hand bar
                          • left-hand insert          • right-hand insert








             Feed direction towards the tailstock

             External LH Thread  • counterclockwise rotation  Internal LH Thread  • counterclockwise rotation
                         • right-hand toolholder    • right-hand bar
                         • right-hand insert        • left-hand insert






             External RH Thread  • clockwise rotation  Internal RH Thread  • clockwise rotation
                          • left-hand toolholder    • left-hand bar
                          • left-hand insert        • right-hand insert









                                                                                                                   37
   32   33   34   35   36   37   38   39   40