How to Calculate Sewing Machine RPM?

Each sewing machine has a maximum speed limit. When a sewing operator performs task on machine he/she does not run the machine at its maximum speed (rpm). How fast a machine is run depends on the skill of the operators and difficulty level of the operations. Your question does not specified whether you want to find maximum rpm of the machine or at what maximum speed a machine can be performed or at what speed operator runs a machine. I have written answer of all three.

1. If you want to know what is the maximum speed limit of a machine then refer to machine manual or sticker attached to the motor.

2. If you want to know how fast a machine can be run use following steps. It is a reverse process of calculating machine rpm. 
  • Cut a fabric strip of 2 meters length and 15 cm wide.(i..e. loop length = 200cm)

  • Make a loop and mark a dark line across.

  • Set machine SPC (e.g. Stitch per centimeter = 4)

  • Thread needle and bobbin

  • Run machine at maximum speed (press pressure foot flat)

  • Record time - record how much time it takes to complete a cycle (2 meters long) e.g. cycle time 12 seconds.

  • Now, use following formula to calculate machine rpm (max. limit)
         Machine RPM = (SPC X Loop length X 60)/cycle time
         In this case Machine RPM is = 4X200X60/12 = 4000

3. If you want to know at what average RPM operator is running a machine, easy way to find the speed is a laser tachometer. Use this tool to record machine rpm (maximum speed on running). To know how to use tachometer read this article.

image courtesy

Related Articles:

How to Estimate Sewing Time by Machine RPM?
How to Find Actual RPM of the Machines running on the Floor?


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Online Clothing Study: How to Calculate Sewing Machine RPM?
How to Calculate Sewing Machine RPM?
Online Clothing Study
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