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Though sewing machine manufacturers define machine rpm (maximum level) in the machine label and manual, in the floor machines are not being operated at maximum speed by the operator. Sewing operator runs a machine at lower a speed than specified maximum speed limit. It is not even possible to sew a garment at maximum machine speed. So, what is the average or maximum speed at which operator run his machine?
To measure speed level of machine, a Laser Tachometer is very useful. Using this instrument you can take measurements from a distance. Laser tachometers work by pulsing a tight beam of light against the rotating element. Affix a reflective tape (small area 1X1 cm) on the machine hand wheel. When machine is being operated, power on the tachometer and keep laser beam direction perpendicular to the reflective tape. Tachometer will record maximum speed of the machine. Further instruction on tachometer is available with instrument brochure.
Having knowledge of machine RPM running on the floor gives added advantage to work study boys (Industrial Engineer). The first and foremost reason, he can find potential improvement areas in floor. If an operator runs machine less than the average speed then he will obviously take more time in completing his task. Operator performance can be increased gradually by increasing machine speed. Secondly, RPM is needed in Calculating SAM.