How to calculate RPM of a Sewing Machine?

 What is RPM?

RPM stands for Revolution Per Minute. That means speed of rotation of a machine per minute is RPM. Every sewing machines have maximum RPM level / speed limit and it has written on the motor. Production will also be higher when an operator operate a machine at high RPM. But sewing operators can't perform a task by operating a machine at maximum RPM because of operator skill level, process difficulties, process Quality & machine quality.

Now we will know how to calculate sewing machine RPM?

Calculation RPM of a sewing machine

We can find sewing machine RPM in 3 ways such as-

1. From user manual of a machine or Sticker attach on a motor: We can find maximum RPM of a machine from here. That means what is the maximum speed level, a machine can be performed we may know from that user manual / sticker.
2. By using laser Tachometer: Measuring speed level of a machine, Laser Tachometer is a very useful tools. By using laser Tachometer, we can observe average or maximum speed of a machine. Read in details How to Use Laser Tachometer from www.onlineclothingstudy.com
3. Calculating actual RPM of a machine while performing by an operator from physical data: How much speed an operator use while operating the machine, we can measure by using following equations-

Machine RPM = ( Loop Length Χ SPC Χ 60 ) / Cycle Time

           Here to calculate machine RPM, need following physical data.

    - Make a loop & mark straight on the loop to stitch.

    - Set the machine SPC ( Stitch Per Centimeter = 4 )

    - Put thread on needle & bobbin

    - Use flat pressure foot

    - Run the machine at maximum speed following mark

    - Record the cycle time of stitching ( for example 15 seconds )

    - Measure the stitch / seam length of the loop for example 250 centimeter.

Now use all the value to the equation and get machine RPM.

Machine RPM = (250*4*60)/15

                          = 4000 RPM

Those are the ways we can calculate sewing machine RPM.

By using same equation, we can calculate operator's using machine speed / RPM also.

For example, 20 seconds time it takes to complete a cycle where all other data is remain same then,

Used Machine RPM = ( 250*4*60)/20 = 3000 RPM.

Note: If a sewing operator operate a machine with lower RPM level, then production will come less than the target. So by improving / increasing used RPM level, we can increase productivity as well. Learn more about Improve Productivity in 20 Ways.

Related Article: How to Find Actual Sewing Time By Using Machine RPM?

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