introduction to line dancing - cabrillo collegejpanzardi/documents/engr12/s17/pdf fil… ·...

Introduction to

Line Dancing With

David Jennings

Machining 12

(The Best of All Trades) Purpose: Provide hands on experience in machining to engineering students

Bridging the Gap

lEngineers design and supervise lconstruction of mechanical devices. lMachinists build the devices lThe skill and knowledge each has lcompliments the other.

Goal

lGain familiarity with fundamental machining concepts and operations

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”)

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

Methods of Machining

lCutting lEDM l3D printing lPrecision grinding

Cutting

lMilling lTurning

EDM

lUsing high amperage electric discharge to evaporate metal.

3D Printing

lBuilding a component by putting down thin layers of material until a 3D object is produced

Grinding

lAbrasive removal of stock

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

Precision Measurement

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!