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Analysis

Pruner Requirements

  • Capable of cutting a 1.75 inch tree branch.

  • Cutting blade must be at least 30” away from trigger.

  • Must weigh less than 3 lbs.

  • All components combined must cost less $500.

Drive Train Requirements

  • The blade must re-open unassisted by the user.

  • Must attach to a standard drill clamp.

  • All parts must withstand 440 in-lbs. of torque and 1000 lbs. of linear force without deflecting more than 0.25”.

  • Drive train must convert rotational motion to linear motion.

  • Must be at least 24” long

  • Must connect the motor to the blade.

  • Must completely open and close the blade.

  • Must fit within a 1” diameter housing tube.

  • Drive train itself must weigh less than 1.25 pounds.

  • Minimum Wall Thickness Linear

  • Minimum Wall Thickness Torque

  • Bearing Slot Length

  • Running Fit

Ball Nut
Self-Reversing Threaded Shaft Analysis

  • Lead Angle

  • Max Torque

  • CNC Threading Properties

  • Torsional Shear

Adapter Tube

  • Torsional Shear

  • Linear Deflection

  • Column Buckling

Drive Shaft

  • Torsional Shear

  • Linear Deflection

  • Column Buckling

  • Stress Concentration 

Adapter

  • Torsional Shear

  • Linear Deflection

Bearings

  • Hardness

Pin

  • Pin In Double Shear

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