Tube Flaring

Figure 5-7.—Mechanically operated tube bender. slide bar is moved around until the mark on the slide  bar  reaches  the  desired  degree  of  bend  on the  radius  block.  See  figure  5-6  for  the  six procedural   steps   in tube   bending   with   the hand-operated  tube  bender. MECHANICAL  TUBE  BENDER.—  The tube bender shown in figure 5-7 is issued as a kit. The  kit  contains  the  equipment  necessary  for bending  tubing  from  1/4  inch  to  3/4  inch  in diameter. This  tube  bender  is  designed  for  use  with aircraft   grade,   high-strengths   stainless-steel tubing,  as  well  as  all  other  metal  tubing.  It  is designed to be fastened to a bench or tripod. The base is formed to provide a secure grip in a vise. This  type  of  tube  bender  uses  a  hand  crank and gears. The forming die is keyed to the drive gear  and  is  secured  by  a  screw. The  forming  die  on  the  mechanical  tube bender  is  calibrated  in  degrees,  similarly  to  the radius  block  of  the  hand  bender.  A  length  of replacement  tubing  may  be  bent  to  a  specified number of degrees or it may be bent to duplicate a bend either in a damaged tube or in a pattern. Duplicating  a  bend  of  a  damaged  tube  or  of  a pattern is done by laying the sample or pattern on top of the tube being bent and slowly bending the  new  tube  to  the  required  bend. Tube Flaring Tube  flaring  is  a  method  of  forming  the  end of a tube into a funnel shape so it can be held by a threaded fitting. When a flared tube is prepared, a flare nut is slipped onto the tube and the end of the tube is flared. During tube installation, the flare is seated to a fitting with the inside of the flare against the cone-shaped end of the fitting, and  the  flare  nut  is  screwed  onto  the  fitting, pulling the inside of the flare against the seating surface  of  the  fitting. Either  of  two  flaring  tools  (fig.  5-8)  may  be used. One gives a single flare and the other gives a double flare. The flaring tool consists of a split die block that has holes for various sizes of tubing, Figure  5-8.—Flaring  tools. 5-7


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