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E27 Fall 2016 Midterm
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Gravity
Terms in this set (51)
boring tool
large holes
Cutting speed
m/s, average radius x rotational speed
Material Removal Rate (MRR)
mm^3/s, speed x depth of cut x feed
Feed Rate
Axial velocity, mm/s, rotational speed x feed
Power
W, kW, MRR x Specific Energy, cutting force x cutting speed, less than lathe motor power, overcoming friction and plastic deformation
Cutting Force
N, Power/Cutting Speed
Feed
t0, mm/rev
Rotational velocity units
radians/sec
Types of chip
continuous chip, continuous chip with built-up edge, discontinuous chip
t0
feed
tc
thickness of chip
chip thickness ratio
t0/tc
depth of cut
width of chip
shear angle
determines thickness of chip and measured from horizontal and line perpendicular to the rake face
rake angle
angle from vertical to the line on rake face. clockwise is positive, counterclockwise negative
specific energy
J/mm^3, Pc/MRR, Fc/[t0 x width]
Merchant's Circle
Friction + Normal = R, Thrust + Cut Force = R, shear force along shear plane, Beta = friction angle, Beta - Alpha for angle between Fc and R
coefficient of friction
tan Beta or tan friction angle
What is t0/tc?
abs(vf/v)
Tool Life Equation
VT^n = C, v = cutting speed, T = Tool lifetime, n and C are empirical constants
If Fc too big
Fracture tool
If Ft too big
Elastically deflect the workpiece or lathe (dimensions affected)
Increasing shear angle
Reduces area of shear plane, reduces amount of work to remove material, less cutting force needed for same MRR
Greater tool nose
Better finish
minimum clearance
Smallest hole, largest peg
Maximum clearance
Largest hole, smallest peg
Clearance fit
Always clearance or line-to-line
Interference fit
Always interference or line-to-line
Transition fit
Clearance or interference
Categories of Clearance fit
RC (Running and sliding), LC (Locational)
Categories of Transition fit
LT (Locational Transition)
Categories of Interference Fit
LN (Locational interference), FN (Force and shrink)
Hole basis
Uppercase H, smallest hole is basic size
Shaft basis
lowercase h, largest shaft is basic size
Straightness
Center axis within a certain diameter ([-], diameter symbol, diameter)
virtual condition
worst case of fit (total diameter = max diameter + straightness tolerance)
Maximum Material Condition
Dimension value where feature contains max material (largest external dimension of shaft or smallest internal dimension of hole)
MMC Tolerancing
M symbol, Extra bonus tolerance. When manufactured part departs from MMC, the departure amount determines bonus tolerance
Roundness
circle symbol, each cross section must be within tolerance
cylindricity
circle symbol with two lines, every cross section must be within tolerance
Line Element
[-, diameter] Any cross section bottom or top edge fits within tolerance
Leading Zero
Inches
Resolution
Smallest detectable difference between two measurements
Accuracy
Deviation of measurement from true value
Precision
Repeatability, Error between a number of successive attempts to achieve target
Measurement tools
Calipers, Micrometer, Dial gage, Coordinate measuring machines, stereo vision, optical interferometry
m
sets of measurements
n
sample size
N
m*n
standard deviation vs standard error
SD uses N, SE = SD/sqrt(n), both centered on true value
Additive Manufacturing
Stereolithography, Fused deposition Modeling, Selective laser sintering, Electron beam melting, 3d printing, poly jet printing
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