Pneumatic Hammer

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Pneumatic Hammer
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Pneumatic What?

• Pneumatic- contains air.
• Hammer uses pressure as force.
• Force drives such bits like chisels.

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Purpose

• To serve as a replacement for the handheld
  hammer.
• To speed up production.
• To give Americans an excuse to be lazy!

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How It Works

• High pressured air goes in.
• Pressure causes piston to move.
• Piston oscillates back and forth.

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How It REALLY Works

• Valve allows air to flow in one direction.
• Piston causes valve to switch.
• Air flows in opposite direction.

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History

• Pneumatic tools developed as early as 1883.
• First pneumatic hammer invented by Charles Brady
  King in 1890.
• Received patent on January 28, 1894.

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Mechanical Output

• Given By Company
• Blows Per Minute 3800 BPM
• Recommended Air Pressure- 90 PSI
• Avg. Air Consumption- 3.2 CFM

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Calculations

• Essentials
• FValve FPiston
• P0V0PV
• Assumptions
• Pressure on Piston is always 90psi.
• Simplification
• Pressure flows in and out freely.

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More Calculations

• FmaPA
• PP0V0/V
• aAP0V0/mV
• V x?r2, x changes
• a(x)k/x, v(x)lnx
• Kinematics!!!

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My Mechanical Output

• Calculated
• Period- 0.0179 s
• Amplitude- 41.9 mm
• Blows Per Minute- 3350 BPM
• Force of one blow- 158 N
• Consumption of Air- 2.79 CFM

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Method To The Madness

• Learning Experience
• Mechanical Design
• Measurements
• Solid Works
• Physical Concepts
• Force versus Pressure
• Limits
• Modeling

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Pau!

• Mahalo!