1. SAFETY PRECAUTIONS FOR MILLING MACHINES
• Wear approved safety goggles.
• See that the table is clean and dry before mounting holding
devices for the work.
• Be sure that the bases of work-holding accessories or w/p are
wiped clean before they are fastened to the table.
• Check to see that the w/p is mounted securely.
• Select and mount the proper cutter, and see that it revolves in the
proper direction.
• Be sure that the arbor, cutter, and collars are clean before
mounting them on the machine Use a rag to handle sharp cutters.
• Keep your fingers clear of the arbor hole when replacing the
overarm support. Fasten the overarm and overarm support
securely. ENG
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2. • Use the proper spindle speed, feed, and depth of cut.
• Keep clear of th revolving cutter. Do not reach over the cutter.
K l f the l i tt D t h th tt
• Stop the cuter to remove chips, and use a brush for chip removal.
• Release all automatic feed controls when the job is completed.
• Keep the floor around the machine free of chips and oil.
• When you are finished, remove and return all tools and
accessories. Brush the m/c free of chips and wipe up all excess
oil.
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3. MILLING MACHINES
# A milling m/c uses one or more revolving cutters to shape the w/p.
# The w/p is usually held in a vise or fixture attached to a movable table.
p y
# Cutting takes place by feeding the w/p against the revolving cutter.
TYPES OF MILLING MACHINES
1. Vertical illi
1 V i l milling m/c
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2. Horizontal milling m/c
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3. Milling m/c for special uses.
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4. Vertical Milling Machine: End-milling cutters of
various types and sizes
are used .
OPERATIONS :
1. horizontal surfaces,
2. vertical surfaces,
3. angular surfaces,
4. shoulders,
5. grooves,
6. fillets,
7. keyways,
7 k
8. T -slots
9.
9 & dovetails ENG
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5. H. milling m/c are made in two
types: 1. Plain 2. Universal
Horizontal Milling Machine
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Plain milling m/c have the table
fixed at a right angle to the
knee.
knee
The universal milling m/c table
to be swiveled to whatever
angle is needed .
The universal milling m/c is
used widely by toolmakers &
Maintenance machinists.
It i the most versatile of all
is th t til f ll
types of milling m/c.
Attachments extend the range of ENG
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work that can be done on both plain
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& universal milling m/c.

6. HORIZONTAL MILLING MACHINE ENG
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7. HORIZONTAL UNIVERSAL MILLIMG M/C
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8. HORIZONTAL UNIVERSAL MILLING M/C
• UNIVERSAL HORIZONTAL MILLING M/C CONSITS OF
TABLE SWIVEL HOUSING WHICH IS LOCATED BETWEEN
TABLE AND SADDLE
SADDLE.
• PERMITS TABLE TO BE SWIVELED 45 04 ON EITHER
DIRECTION ON HORIZONTAL PLANE.
• USED FOR MILLING OF HELICAL GROOVES IN TWIST
DRILLS, MILLING CUTTERS AND GEARS
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9. Milling Machine Attachments and Accessories
A wide variety of accessories are available to increase the
versatility and productivity of a milling machine.
MILLING MACHINE ATTACHMENTS
1. Vertical Milling Attachment:
Vertical tt h
V ti l attachments enable the
t bl th
horizontal milling m/c to be
used for operations
such as face milling
milling,
end milling, drilling, boring,
and T -slot milling.
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10. 2 . Slotting Attachment
It converts the rotary motion of the spindle into reciprocating
motion for cutting keyways, splines, templates, and irregular-
shaped surfaces.
VERTICAL ATTACHMENT SLOTTING ATTACHMENT
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11. CUTTER-HOLDING ACCESSORIES
Arbors, Collets, and Adapters
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Fig : Mounting a milling cutter on an arbor for
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12. ARBOR………
One end of the arbor is
held in the milling
machine spindle while
the outer end is
supported by one or
more arbor supports.
The cutter is position on
the arbor by collars and
is prevented from
turning on the arbor by
a square key .
COLLETS……
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13. WORK-HOLDING DEVICES FOR
MILLING M/C
1. Vise
2.
2 Chucks
3. Rotating tables
4. Angle plates
5. Special fixtures
p
6. Universal dividing head
7.
7 Clamp work to table
8. V - Blocks
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14. ROTARY TABLE
A plain milling machine vise
V-BLOCK
A universal vise permits compound angles to be machined
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VARIOUS CLAMPS…. E
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16. MILLING CUTTERS & OPERATIONS….
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18. A SHELL MILL CUTTER
Fig : (a) T-slot cutting with a milling cutter
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19. LIGHT DUTY PLIAN MILLING CUTTER
PLAIN MILLING CUTTER
HIGH HELIX PLIAN MILLING
CUTTER
HEAVY DUTY PLAIN MILLING
CUTTER ENG
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20. Standard Shank-Type Helical Milling Cutters
FACE MILLING CUTTER
SIDE MILLING
CUTTER
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Shell End Mills
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21. Types of Formed Cutters
yp
GEAR TOOTH
CONCAVE CUTTER CONVEX CUTTER
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22. CUTTING SPEED, FEED & DEPTH OF CUT
CUTTING SPPED DEPENDS ON…..
• Type of work material
• Cutter
C tt material
t i l
• Diameter of the cutter
• Surface finish required
• Depth of cut
p
• Rigidity of the machine and work setup
INCH METRIC
4X CS 320 X CS
r / min = r / min =
D D
CS= Cutting speed (m/min)
CS= Cutting speed (ft/min)
D= Dia of cutter ( mm)
D= Dia of cutter ( inch) ENG
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23. Feed
Feed is the rate at which the work moves into the
revolving cutter.
It is measured in either inches per minute or millimeters
per minute.
INCH CALCULATIONS MERTIC CALCULATIONS
FEED INCH / min = N X c.p.t X r / min FEED mm/ min = N X c.p.t X r / min
N = NUMBER OF TEETH ON CUTTER
c.p.t = chip per tooth for a cutter & material ENG
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24. Chip per tooth is the amount of material which should
be removed by each tooth of the cutter as it revolves
and advances into the work.
Depth f t
D th of cut
Where a smooth accurate finish is desired, it is
considered good milling practice to take a roughing
and finishing cut.
Roughing cuts should be deep, with a feed as heavy
as the work and the machine will permit.
When a fine finish is required, the feed should be
reduced rather than the cutter speeded up. ENG
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