Consumption formula for 3 thread over lock sewing ,

I.E department law 

Tex-know

                        

Consumption formula for 3 thread over  lock sewing ,

C = ( 3N+ 4W+ 4T ) × S

 = 3NS + 4WS+ 4TS

 =  3+  4S ( W+T )

Here , NS= 1

            S = stitch per inch

            T = thickness

           W =  seam width .

An example , if there are 9 stitch per inch thickness are 0.05 inch and seam width 0.25 inch  then what will be thread consumption per inch ?

 Now C = 3+ 4S(W+T )

             = 3+ 4×9 ( 0.25+0.05 )

              = 13.8  inch .