Consumption formula for interlock sewing machine ,

I.E department law

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Consumption formula for interlock sewing machine ,

   Inter lock = over lock + chin stitch .

Example if there are 24 yds of inter lock sewing in a garments then how many mater of sewing thread are needed for inter lock sewing ?  if over lock stitch per inch 13  and chin stitch per inch 4  then calculation.

Now ,   Over lock  stitch , 1 yds = 36 inch

                                    20 yds = 20 ×36 = 720 inch

                                     1 inch = 13 inch thread

                                     720 inch  = 13 ×720 = 9360 inch

                                       1 meter = 39.37 inch

                                        9360 inch = 9360 inch ÷39.37 inch  = 273.75 meter

Now chain stitch , 1 yds = 36 inch

                                    20 yds = 36 ×20 =720 inch

                                  1 inch stitch = 4 inch thread

                                    720 inch = 4×720 = 2880 inch thread

                                   1 meter = 39.37 inch

                                    2880 inch = 2880 inch ÷39.37 inch  = 73.16 meter thread

So inter lock stitch consumption = 273.75+73.16  = 347 mater