Manufacturing Automation: Metal Cutting Mechanics, Machine Tool Vibrations, And Cnc Design 2nd Edition

With typical training in CNC machining and programming the details of actual physical processes occurring in a run or cutting of a part are often and usually slighted. The instructor assumes most of the class doesn't have the math or physics background to understand or is him(her)self an in-house engineer(job trained, no relevant degree) and doesn't feel competent to speak on the matter. Whatever the case, if you've had some CNC training or machining background and are comfortable with engineering mechanics (mainly statics), mechanics of materials (strength of materials), and vibration analysis or have a physics background with a rapport for these subjects you can profit from this text. In chapter 2 on metal cutting basics you're given pretty much just basic free body force diagrams with cutting blade moving into the work material and various angles and force components labeled accordingly. The variables that are empirical or must be determined by inspection are stated as such but you'll see their influence in the diagrams. Pretty much even- though the work piece or cutter is moving it boils down to an instantaneous static analysis. Example- you'll determine an average friction force in this type of analysis, you'll multiply it by cutting speed giving power which translates to heat generated per time. .When you come to vibration analysis you'll be confronted with transfer functions and use of Laplace transforms which is reviewed in an appendix. If you've done any AC circuit theory you saw this in context with Bode diagrams. Also chatter is explored here-the work piece goes into self vibration with periodic alternate contraction and expansion resulting in alternate shallow and deep cuts respectively-hence the wavy pattern. Later you explore the construction of the CNC and its functioning , i.e., both form and function, as well as the rudiments of programming. I could go on-like if there's excess static deflection from excess pressure of the cutter on the piece-the part will be cut out of tolerance. Guess I'll end here and just say there's no better text on the market dealing with these specialized matters.

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