Geometry Flat Out Length Lecture by n09C7b

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									     Geometry

Compute Flat-out Length
         Flat-out Length
To end up with this part as dimensioned…
          150 mm                 Stock Thickness = 2.5 mm


               32 mm
                                     145 mm



…how long must the original material be?
                       322 mm

                   Flat-out Length
              Key Concept
Distinguish between Inside and Outside
dimensions.
     inside




      outside    inside




                          outside
Inside & Outside Dimensions
                                    59 mm

 Stock Thickness = 2 mm




                                            68 mm
                                            64 mm




                             85
                          83 mmmm
                 Procedure
 Check the dimensions of the finished part.
 – If there are any “outside” dimensions, convert
   them to “inside” dimensions.


Flat-out Length = Sum of all the inside dimensions

             Assumptions
             1) The stock is relatively thin.
             2) The bends are sharp & 90
                    Example
Determine the flat-out length.
                                120 mm
Stock Thickness =
      3 mm



         92 mm          42 mm




                       92mm + 39 mm + 117 mm = 248 mm
                Circles
To compute the flat-out length of a circle
(or arc), reference off the centerline of the
material.
               Example
 Determine the flat-out length to needed to
 make this circular object.
                               Thickness = 0.3”




O.D. = 8.5”



                                        C=d
                                        C = 3.14 x 8.2”
                                        C = 25.748”
          Example – Arcs
Compute the flat-out length needed to
make the arc (1/4 circle).
                            Thickness = 6 mm




    Inside Radius = 95 mm


                   +             C=d
                                 C = 3.14 x 196 mm
                                 Arclength = 615.44 x ¼
                                 Arclength = 153.86 mm
            Practice
Worksheet

								
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