Analysis
Pruner Requirements
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Capable of cutting a 1.75 inch tree branch.
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Cutting blade must be at least 30” away from trigger.
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Must weigh less than 3 lbs.
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All components combined must cost less $500.
Drive Train Requirements
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The blade must re-open unassisted by the user.
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Must attach to a standard drill clamp.
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All parts must withstand 440 in-lbs. of torque and 1000 lbs. of linear force without deflecting more than 0.25”.
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Drive train must convert rotational motion to linear motion.
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Must be at least 24” long
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Must connect the motor to the blade.
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Must completely open and close the blade.
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Must fit within a 1” diameter housing tube.
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Drive train itself must weigh less than 1.25 pounds.
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Minimum Wall Thickness Linear
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Minimum Wall Thickness Torque
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Bearing Slot Length
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Running Fit
Ball Nut
Self-Reversing Threaded Shaft Analysis
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Lead Angle
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Max Torque
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CNC Threading Properties
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Torsional Shear
Adapter Tube
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Torsional Shear
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Linear Deflection
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Column Buckling
Drive Shaft
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Torsional Shear
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Linear Deflection
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Column Buckling
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Stress Concentration
Adapter
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Torsional Shear
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Linear Deflection
Bearings
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Hardness
Pin
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Pin In Double Shear