Milling Machinery-background

Milling Machinery-background - Milling Machinery Chapter 25...

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       Milling Machinery Chapter 25
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    Early Milling Machine
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    Milling Used primarily to produce flat surfaces Multi-tooth cutter High Material Removal Rates Surface finish – 60 to 150 μin Used in mass production Tolerances Machining:  +/- 0.0005” Slotting: +/- 0.001” Flatness: 0.001 in/ft
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    Historical Notes Simeon North (created with inventing) Contract to produce 20,000 pistols with  interchangable parts for War Department Eli Whitney Contact to produce 10,000 muskets First milling machine in use 1818
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    Milling Compared to Turning Turning Rotating workpiece Non-rotating tool Constant engagement Constant chip thickness Constant cutting forces Feed force parallel to  spindle bearings Milling Non-Rotation workpiece Rotating tool Interrupted engagement Varying chip thickness Varying cutting forces Feed force  perpendicular to spindle  bearings
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Milling Machinery-background - Milling Machinery Chapter 25...

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