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Lead Screw Calculator

• Torque Backdrive

  Torque Backdrive

  Load (in lbs.)

  Lead (in/rev)

  Backdrive Efficiency

  Torque (in lbs.)

  Torque = in.lbs.
  

• Torque Forward Drive

  Torque Forward Drive

  Load (in lbs.)

  Lead (in/rev)

  Efficiency

  Torque (in lbs.)

  Torque = in.lbs.
  

• Key Torque-Back Drive

  Key Torque-Back Drive

  Load (in lbs.)

  Lead (in/rev)

  Backdrive Efficiency

  Torque (in lbs.)

  Torque = in.lbs.
  

• Key Torque-Forward Drive

  Key Torque-Forward Drive

  Load (in lbs.)

  Lead (in/rev)

  Forward drive Efficiency

  Torque (in lbs.)

  Torque = in.lbs.
  

• Speed

  Speed

  Lead (in/rev)

  Rotation Speed (rpm)

  Speed (in./min.)

  Speed = in./min.
  

• Drive Horsepower-Rotary

  Drive Horsepower-Rotary

  Drive Torque (in lbs.)

  Rotational Speed (rpm)

  Drive Horsepower-Rotary (hp)

  Drive Horsepower-Rotary = hp
  

• Drive Horsepower-Linear

  Drive Horsepower-Linear

  Load (lbs.)

  Speed linear (in/min)

  Drive Horsepower-Linear (hp)

  Drive Horsepower-Linear = hp
  

• Critical Speed

  Critical Speed

  Minor Diameter (in)

  Factor of safety

  Unsupported Length (in)

  End Fixity Factor Fixed-free: 0.32 Supported-supported: 1.00 Fixed-supported: 1.55 Fixed-fixed: 2.24

  Critical Speed (rev/min)

  Critical Speed = rev/min
  

• Column Loading

  Column Loading

  Maximum safe column load (lbs)

  Factor of safety

  End Fixity Factor Fixed-free: 0.25 Supported-supported: 1.00 Fixed-supported: 2.00 Fixed-fixed: 4.00

  Column Loading (lbs)

  Column Loading = lbs
  

• Efficiency - Power Screws - Forward Drive

  Efficiency - Power Screws - Forward Drive

  Lead Angle (degrees)

  Thread angle in normal plane (degrees)

  Coefficient of friction

  Forward Drive Efficiency

  Forward Drive Efficiency =
  

• Efficiency - Power Screws - Back Drive

  Efficiency - Power Screws - Back Drive

  Lead Angle (degrees)

  Thread angle in normal plane (degrees)

  Coefficient of friction

  Backdrive Efficiency

  Backdrive Efficiency =
  

• Lead Angle

  Lead Angle

  Lead (in/rev)

  Screw pitch diameter (in)

  Lead Angle (degrees)

  Lead Angle = degrees
  

• Wear Life For Ball Screws

  Wear Life For Ball Screws

  Operating load rating (lbs)

  Actual load (lbs)

  Wear Life for Ball Screws (in)

  Wear Life for Ball Screws = in
  

• Acceleration Force Objects In Linear Motion

  Acceleration Force Objects In Linear Motion

  Weight of object (lbs)

  Change in linear speed (ft/min)

  Time period to accelerate (sec)

  Acceleration Force, Linear Motion (lbs)

  Acceleration Force, Linear Motion = lbs
  

• Acceleration Torque Objects In Linear Motion

  Acceleration Torque Objects In Linear Motion

  Rotational inertia of object (lbs ft2)

  Change in rot. speed (rpm)

  Time period to accelerate (sec)

  Acceleration Torque, Rotary Motion (ft lbs)

  Acceleration Force, Rotary Motion = ft lbs