How does the thrust force change with the cutting force

# How does the thrust force change with the cutting force -...

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How much part deflection is there in turning? How does the thrust force change with the cutting force ? Prof. Christopher Brown WPI

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Actual forces Note the spindle power Note the cutting speed Solve for the cutting force P=vFc Calculate the specific energy for machining from the Force and the cut area u = Fc(feed*depth of cut) Measure the chip thickness Use the geometry of the chip and the rake angle to determine the shear angle Use Merchant’s equation to determine the friction angle Calculate the normal force from the cutting force and the friction angle Calculate the components of the force that contribute to deflection and calculate the deflection
Machining forces and Friction α sin cos c t F F F + = sin cos t c F F N - = φ sin cos t c s F F F - = cos sin t c n F F F + = Rake face Frictional force and normal force Shear plane forces F t F n F c F s N F = = τ μ tan tan tan t c c t F F F F - + = Tool workpiece friction coefficient µ and friction angle τ

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Ft/Fc = tan(τ-α) Ft = Fc tan(τ-α) 1. Use Merchant’s circle to Write Ft in terms of Fc
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## This note was uploaded on 04/29/2008 for the course ME 1800 taught by Professor Brown during the Winter '08 term at WPI.

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How does the thrust force change with the cutting force -...

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