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Spinning calculator

Speedframe / Ringframe Twist Per Inch

Calculate Twist Per Inch (TPI) / Twist Per Meter (TPM) from spindle speed and front roller surface speed.

Twist Per Meter (TPM)
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Twist Per Inch (TPI)
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Method and formula

TPM=Spindle Speed (RPM)Front Roller Surface Speed (m/min)TPI=Spindle Speed (RPM)Front Roller Surface Speed (inch/min)\text{TPM} = \frac{\text{Spindle Speed (RPM)}}{\text{Front Roller Surface Speed (m/min)}} \\[1em] \text{TPI} = \frac{\text{Spindle Speed (RPM)}}{\text{Front Roller Surface Speed (inch/min)}}

Input variables

VariableExpected entry
Spindle speed (RPM)Enter a positive measured value.
Front roller surface speed (meter/min)Enter a positive measured value.

Calculation workflow

  1. Enter the measurements in the displayed units.
  2. Check the selected yarn, fiber, weave, or trade unit where shown.
  3. Review each calculated output and its unit.
  4. Use Copy results to save the displayed values to recent history.

Outputs

  • Twist Per Meter (TPM)
  • Twist Per Inch (TPI)