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8/7/2019 machining basic concepts
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Machining Lab Slide 1ME313 Metals Processing - Lab Last Modified by PAN 2/25/05
ME 313
Machining Lab
ME 313 Manufacturing Processes
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Machining Lab Slide 2ME313 Metals Processing - Lab
Purpose Introduction of the terminology and
operation of basic machine tools.
Learn the basic shop math associated with
these processes. Lathes
Drill Presses Milling Machines
Surface Grinders
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Machining Lab Slide 3ME313 Metals Processing - Lab
Safety Precautions
Wear safety glasses in the machine tool laboratoryat all times.
Concentrate on your present task, watch theoperation carefully and shut off the machine if in
doubt as to its operation. If a question arisesregarding machine use, ask the teaching assistantfor help, as opposed to guessing about theoperation.
When operating a machine , do not leave from theimmediate vicinity of that machine.
Do not hammer or use excess force on any part ofany machine tool.
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8/7/2019 machining basic concepts
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Machining Lab Slide 5ME313 Metals Processing - Lab
Safety Precautions
Immediately report any accident or hazardouscondition to your laboratory instructor, the shopsupervisor, or any other university employeeworking in the area. For first aid other than
available in the laboratory, phone Emergency 911or2-2957 on the telephone located in thelaboratory.
There will be no smoking or food allowed in the
laboratory. Long pants or sweats must be worn at all times in
the laboratory.
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Machining Lab Slide 6ME313 Metals Processing - Lab
Lathes n = Rotational Speed (frequency) revolutions per min, rpm
V = Cutting Speed ( Speed at Periphery of work piece) feet per min
V = n * D
V = n(rev/min) * D(in/rev) =in/min
in/min *ft/12 in = ft/12min
n = V/D where V is in ft/minD is in inches
n = 12V/D
n 4 (V/D)=
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Machining Lab Slide 7ME313 Metals Processing - Lab
Lathes (Cont.) f = feed, advance of tool per revolution of work pieces (in / rev)
F = feed rate (in/min)
t= time, to make the cut (min)
t = length of cuttool velocity
LF
F = f n*
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Machining Lab Slide 8ME313 Metals Processing - Lab
Drill Pressesn = rotational speed of the drill (rpm)
D = diameter of drill (inches)
V = cutting speed of the drill
l
l
n = 12V/D
t = length of cut
Feed rate
F = f n*
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Machining Lab Slide 9ME313 Metals Processing - Lab
Drill Pressesn = rotational speed of the drill (rpm)
D = diameter of drill (inches)
V = cutting speed of the drill
l
l
n = 12V/D
t = length of cut
Feed rate
l + l
F
45
l = D
xx
F = f n*
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Machining Lab Slide 10ME313 Metals Processing - Lab
Millingn = rotational speed of the cutter (rpm)
f = feed per tooth!!! (inches / tooth)
N = number of teeth (teeth)
F = feed rate of the table (inches / (min)
t = time to make cut in milling (min)
F = f *N* n
d
l
Rt = length of cutFeed rate
l + l
F
l
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Machining Lab Slide 11ME313 Metals Processing - Lab
Millingn = rotational speed of the cutter (rpm)
f = feed per tooth!!! (inches / tooth)
N = number of teeth (teeth)
F = feed rate of the table (inches / (min)
t = time to make cut in milling (min)
d
l
l
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Machining Lab Slide 12ME313 Metals Processing - Lab
Millingn = rotational speed of the cutter (rpm)
f = feed per tooth!!! (inches / tooth)
N = number of teeth (teeth)
F = feed rate of the table (inches / (min)
t = time to make cut in milling (min)
d
l
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Machining Lab Slide 13ME313 Metals Processing - Lab
Millingn = rotational speed of the cutter (rpm)
f = feed per tooth!!! (inches / tooth)
N = number of teeth (teeth)
F = feed rate of the table (inches / (min)
t = time to make cut in milling (min)
F = f *N* n
d
l
d
R-dR
t = length of cut
Feed rate
l + l
F
l
Pythagoreans Theorem
l2 = R2(Rd) 2
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Machining Lab Slide 14ME313 Metals Processing - Lab
Milling Direction
Up MillingStarts with a small cut and finishes
with a large cutPushes the material away from the
cutter
Used for rough cutting
Used for deep cuts
Down/Climb MillingStarts with a large cut and finishes
with a small cutPulls the material into from the
cutter
Better surface finish
Uses less Power
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Machining Lab Slide 15ME313 Metals Processing - Lab
Optional Homework
1) In your lab manual there is a worksheet
which is optional
2) Solutions will be posted later this week on
the web
3) Strongly Recommended