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Introduction to
Line Dancing With
David Jennings
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Machining 12
(The Best of All Trades) Purpose: Provide hands on experience in machining to engineering students
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Bridging the Gap
lEngineers design and supervise lconstruction of mechanical devices. lMachinists build the devices lThe skill and knowledge each has lcompliments the other.
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Goal
lGain familiarity with fundamental machining concepts and operations
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What is Machining Anyway?
lHistorically machining has been any number of material removal processes. l Generally performed to a high degree of accuracy lMore recently additive manufacturing has been included (“3D printing”)
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What is a Machinist
lA person with specialized knowledge in the art of machining and skill in precision work. lTypes: lManual l CNC lTool and Die lSpecialist
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Methods of Machining
lCutting lEDM l3D printing lPrecision grinding
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Cutting
lMilling lTurning
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EDM
lUsing high amperage electric discharge to evaporate metal.
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3D Printing
lBuilding a component by putting down thin layers of material until a 3D object is produced
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Grinding
lAbrasive removal of stock
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Thoughts on Precision
l1/16 in. is .0625 of an inch lHuman hair is .003 inch (Three thousandths) lMachinists work with tolerances near a human hair lTool Makers work with .0001 inch (one ten thousandth) lLight Waves are near .000016 Inchs (16 millionths) lGage blocks used by machinist/ tool makers are accurate to .000002 inches
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Precision Measurement
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l1. Plan ahead l2. Motion ain't necessarily progress l3. Safety first, last, and ALWAYS: Particularly over appearance l4. Horseplay has no place in any workshop l5. Last, but not least – Never underestimate the power of a wily old machinist!