Circular-machine production calculations
The speed of a circular machine may be expressed in three ways: –
• As machine revolutions per minute.
• As circumferential speed in metres per second.
• As Speed Factor (rpm X diameter in inches).

Formulation:-
The speed of fabric formation expressed in linear metres per hour is equal to (speed of machine in rpm X percent efficiency X number of knitting feeders X 60 minutes)÷ (number of feeds per face course X face courses per cm X 100).

Example:
Calculate the length in metres of a plain, single-jersey fabric knitted at
16 courses/cm on a 26-inch diameter 28-gauge circular machine having 104 feeds.
The machine operates for 8 hours at 29 rpm at 95 per cent efficiency.
Solution:-

Number of courses knitted in 8 hours = 8 X 29 X 104 X 95 X 60 / 100
Therefore the total length of the fabric in metres = 8 X 29 X 104 X 95 X 60 / 16 X 100 X 100 = 859.60 meters

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