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Spinning calculator

Drawframe Drafts

Calculate Break Draft, Main Draft, and Total Draft across Drawframe rollers.

Break Draft
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Main Draft
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Total Draft
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Method and formula

Break Draft=Surface Speed of 2nd RollerSurface Speed of Back RollerMain Draft=Surface Speed of 1st RollerSurface Speed of 2nd RollerTotal Draft=Surface Speed of Delivery RollerSurface Speed of Feed Roller\begin{aligned} \text{Break Draft} &= \frac{\text{Surface Speed of 2nd Roller}}{\text{Surface Speed of Back Roller}} \\[1em] \text{Main Draft} &= \frac{\text{Surface Speed of 1st Roller}}{\text{Surface Speed of 2nd Roller}} \\[1em] \text{Total Draft} &= \frac{\text{Surface Speed of Delivery Roller}}{\text{Surface Speed of Feed Roller}} \end{aligned}

Input variables

VariableExpected entry
Back roller surface speedEnter a positive measured value.
2nd (Middle) roller surface speedEnter a positive measured value.
1st (Front) roller / delivery speedEnter a positive measured value.
Feed roller surface speedEnter 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

  • Break Draft
  • Main Draft
  • Total Draft