Lecs 1-13 Flashcards
(17 cards)
LEC 3: FUNDAMENTALS OF MACHINING
What are two drawbacks of maching?
1) It’s time-consuming
2) It’s wasteful
Name three important machining processes and three less-important ones
1) Turning
2) Drilling
3) Milling
4) Broaching
5) Filing
6) Sawing
Compare and contrast turning, drilling, and milling.
1) Turning is a single-point cutting tool, used to create a cylindrical object.
2) Drilling is a two or three-point cutting tool used to create holes.
3) Milling is a multiple-point cutting tool used to create planes and flat edges.
What are the three dimensions of the machining process?
1) Cutting speed v, in rpm
2) Feed f, in lateral distance per rotation
3) Depth of cut d
What’s the difference between roughing and finishing?
1) Roughing is a high MRR with low cutting speed
2) Finishing is a low MRR with high cutting speed.
Name the five dependent variables in cutting mechanics
1) Chip type (discontinuous, continuous)
2) Forces and energy dissipated
3) Temperature rise
4) Tool wear and failure
5) Surface finish and integrity
Lec 4: Cutting Technology
What are the two principal aspects that define a tool’s life?
1) Tool materials
2) Tool geometry.
What are the three modes of tool failure you’ve seen?
1) Fracture failure (brittle, high forces)
2) Temperature failure (tool melted)
3) Gradual wear (preferred)
What are the two principal forms of gradual wear?
1) Flank wear
2) Crater wear
What causes crater wear?
High temperatures and pressures of chips coming off workpiece.
What are the three mechanisms that can cause gradual tool wear?
1) Abrasion (through hard particles in the work surfae)
2) Adhesion (from high temperatures, welding workpiece and tool together)
3) Diffusion (an exchange of atoms, depleting the tool of its strength.
What are five benefits to using cutting fluid?
1) 2) Controlling temperature and friction
3) Disposing of chips
4) Keep metal part easy to handle
5) Keeping dimensional control.
What are the two functions of cutting fluids, and the four material types often used?
1) Coolants
2) Lubricants
1) Oils
2) Emulsions
3) Semisynthetics
4) Synthetics
What are four ways of applying cutting fluid?
1) Flooding
2) Misting
3) High pressure
4) Through the tool
LEC 5 (Skipped tool materials) What's the difference between turning and boring?
Turning operates on the outside face of a cylidrical workpiece. Boring operates on the inside face.
What are the four steps to the most accurate hole you can make?
1) Centering
2) Drilling
3) Boring
4) Reaming
What’s the difference between peripheral and face milling?
1) Peripheral is like planing
2) Face milling is like moving a drill through a face
