IME 143 Cal Poly Midterm Study Guide

Manufacturing Industries: Primary

Those that cultivate and exploit natural resources

Manufacturing Industries: Secondary

Convert Primary Industry outputs into products

Manufacturing Industries: Tertiary

Service sector of the economy

Manufacturing Processess

Processing, and assembly operations, Material Handling, Inspection and testing, Coordination and Control

Machining produces chips through…

Turning, milling, drilling, sawing and broaching

Dimensioning: The process of defining the ____, form and ____ of geometric components on egnineering and or architectural drawings

size, location

Accuracy

How well the measured value agrees with the desired value

Precision

How closey grouped the measured values are

Rule of 10

The measuring device must be 10 times more precise than the specified tolerance

Variables Inspection

Dimensions measured with measuring equipments

Attributes Inspection

Guaged to determine whether parts parts are a go or no-go. Done quickly and at a low costq

Machining Processes all perform

Depth of Cut, feed rate, surface speed

Surface speed

ft/min

Feed rate (Chip load): Lathe

in/rev (no calc)

Feed rate (Chip load): Mill

in/tooth (calc)

On a turning center the ____ rotates and the ___ is stationary

Work piece, tool

RPM for turning

4V/D

____ machines ar used for general purpose manual milling operations.

Column and knee

The term ____ describes almost any CNC milling and drilling machine

machining center

Climb milling

Preferred for CNC

Face milling

Machining of a flat surface normal to the axis of the rotating cutter

Peripheral milling

Aka plain milling or end milling. The axis of the cutter is parallel to the workpiece surface

Table Feed rate

F = (RPM, N) * (chip load, f) * (# of teeth, T)

Metals for machining are supplied in 4 forms

1) Blocks, bars or sheets 2) Castings 3) Forgings 4) Custom Extrusions

Cold saw

Create precise, burr free cuts and corner miters without sparks or generating heat

Lead angle

The angle between the cutting tools edge and the workpieceRa

Rake angle

when the tool face or surface against the which the chips touch is inclined for the purpse of either increasing the or diminshing the keenness or bluntness of the edge

Corner radius/Nose radius

Strengthens the cutting edge, improves finish and influences tool life. Bigger = smoother but can induce chatter when to big. Too small may result in premature chipping or prevent proper distribution of heat.

Cutting Tool materials

High carbon steel, high speed steel, Carbine (Tungsten Carbide)

Drill sizes

Metric, fractional, letter, number

Reaming

A process which slightly enlarges a pre-existing hole with a tight tolerance diameter

Boring

An operation where a hole is enlarged with a single point cutting tool

Thread callout

A = Externat, B = internat

External Threads

Can be made with dies

Internal threads

Can be made with taps and holders

Cutting Fluids

Reduces the friction as well as cools the workpiece