Miling machine

Basic idea about milling machine.

1. By: Saumya Ranjan BehuraBy: Saumya Ranjan Behura

2.  Milling machine unlike lathes they require
more power than hand driven – lathes.
Milling is the process of machining flat , curved,
or irregular surfaces by feeding the work piece
against a rotating cutter containing a number of
cutting edges.

3. THANK YOU SO MUCH

4. 1.Vertical milling machines.
2.Horizontal milling machines.
These machine also classified as:
Knee-type, Ram-type, manufacturing or bed type,
and planer-type.

5. The universal milling machine:
A more complex form of the milling machine
The table of universal milling machine can be
swiveled through angle (up to 45 in either
direction).
The universal milling machine can be fitted with
various attachments such as :
The indexing fixture, rotary table, slotting and
rack cutting attachments and various special
fixtures.

6. The universal milling machine may be vertical
or horizontal machines.
The main components of these machines:
1.Ram
2.Spindle
3.Table
4.Saddle
5.Knee
6.Column
7.screw

8. FEEDING MECHANISM

10. SPECIFICATION OF THE MACHINE
Working surface49 1/4” x 11” (1250 x 280mm)
Number of T slots3” x 5/8” (3 x 16mm)
Distance between T slots2 1/2” (63mm)
Table Swivel+/- 45°
Tabl
e
Transverse
Automatic Longitudinal 33 1/2” (851mm)
Automatic Cross 12” (290mm)
Automatic Vertical 18 3/4” (475mm)
Distance From Spindle to Over arm. 5 3/4” (147mm)

11. Feeds
Horizontal spindle
Number of Feeds Cont. Variable Speed
Longitudinal and Cross
Feed
0 + 51 3/16” (0 + 1300mm)
Vertical Feed 0 + 15 3/8” (0 + 390mm)
Spindle Taper #40
Main Spindle Diameter 3 1/2” (88.88mm)
Arbor Milling Diameter 1” (22mm)
Number of Speeds Variable Speed
Speed Range at 50Hz 35 - 1800 RPM
Speed Range at 60Hz 42 - 2160 (±10%) RPM

12. Main motor
Coolant system
weight
Main Spindle 5.5 HP
Working Feeds - Quick
Traverse
2 HP
Coolant Pump 0.12 HP
Approximate Net Weight 1800 kg
Maximum Weight Over the
Table
300 kg

13. MILLING
OPERATIONS
1.Plain milling
Called surface milling or slab milling, is milling flat surfaces
with milling cutter axis parallel to the surface being
milled

14. 2. Angular milling
Angular milling, or angle milling, is milling flat
surfaces which are neither parallel nor
perpendicular to the axis of the milling cutter. A
single angle milling cutter is used for angular
surfaces, such as chamfers, serration's, and grooves.
Milling dovetails is a typical example of angular
milling.

15. 3. Milling dovetails
The usual angle of cutter is 45° 50°, 55°, or 60° based on
common dovetail designs
4. Straddle Milling
When two or more parallel vertical surfaces are
machined at a single cut, the operation is called
straddle milling. Straddle milling is accomplished by
mounting two side milling cutters on the same arbor,
set apart at an exact spacing. Two sides of the work
piece are machined simultaneously and final width
dimensions are exactly controlled. Straddle milling
has many useful applications in production
machining.

16. 5. Milling Hexagon
The work piece is usually mounted between centers in
the indexing fixture or mounted vertically in a swivel
vise. The two side milling cutters are separated by
spacers, washers, and shims so that the distance
between the cutting teeth of each cutter is exactly
equal to the width of the work piece area required.

17. 6. Face milling
Face milling is the milling of surfaces that are
perpendicular to the cutter axis. Face milling
produces flat surfaces and machines work to the
required length. In face milling, the feed can be either
horizontal or vertical.

18. 7. Gang Milling
which two or more milling cutters are mounted on the
same arbor and used when cutting horizontal
surfaces.
All cutters may perform the same type of operation or
each cutter may perform a different type of operation.

19. 8. Form Milling.
IS the process of machining
special contours composed of
Curved and straight lines , or
Entirely of curves, at a single cut.
The more common form milling
operations involve milling
half-round recesses and beads
and quarter-round radii on
Work piece

20. 9. Fly cutting
Fly cutting is one of the most versatile milling
operations. It is done with a single- point cutting
tool shaped like a lathe tool bit. It is held and rotated
by a fly cutter arbor . formed cutters are expensive
And usually suitable only for one particular job

21. 10. Gear cutting
Is enough of the broken gear to grind the cutting tool to
the proper shape. It can also be used in the cutting of
splines and standard and special forms.
11. Keyway Milling
The type of key and corresponding keyway to be used
depends upon the class of work for which it is
intended.
Types of keys :
1.Woodruff key
2.Square - end machine keys
3.Round - end machine keys

22. 1.Wood ruff key
The Woodruff keys are semi cylindrical in shape and
are manufactured in various diameters and width
2.Square - end machine key
Square-ends machine keys are square or rectangular in
section and several times as long as they are wide.
For the purpose of interchangeability and
standardization, these keys are usually
proportioned with relation to the shaft diameter

23. 3.Round – end- machine key
The round-ends machine keys are square in section with
either one or both ends rounded off. These keys are
the same as square-ends machine keys in
measurements.

24. MILLING CUTTER USED
FOR MILLING KEYWAYS

25. 12. T slot milling
Cutting T-slots in a work piece holding device is a
typical milling operation. The size of the T-slots
depends upon the size of the T-slot bolts which will be
used. Dimensions of T-slots and T-slot bolts are
standardized for specific bolt diameters.
Selection of milling cutter:
The T-slot milling cutter is then
used to cut the head space to the
prescribed dimensions.

26. 13. Sawing and parting
Metal slitting saw milling cutters are used to part stock
on a milling machine . The work piece is being fed
against the rotation of the cutter.

27. 14. Gear cutting
Gear teeth are cut on the milling machine using formed
milling cutters called involute gear cutters. These
cutters are manufactured in many pitch sizes and
shapes for different numbers of teeth.
15. Drilling
The milling machine may be used effectively for drilling,
since accurate location of the hole may be secured by
means of the feed screw graduations. Spacing holes in
a circular path, such as the holes in an index plate,
may be accomplished by indexing with the index head
positioned vertically.

28. 16. Boring
Various types of boring tool holders may be used for
boring on the milling machine, the boring tools being
provided with either straight shanks to be held in
chucks and holders or taper shanks to fit collets and
adapters. The two attachments most commonly used
for boring are the fly cutter arbor and the offset
boring head.
The single-edge cutting tool used for boring on the
milling machine is the same as a lathe cutter bit.
Cutting speeds, feeds, and depth of cut should be the
same as that prescribed for lathe operations.

29. TOOL HOLDING
Methods of cutters fixation:
Types of fixation
1. Arbors

30. Arbors are supplied with one of
three tapers to fit the milling
machine spindle:
.
11
. Standard milling machine arbor
The standard milling machine arbor has a tapered,
cylindrical shaft with a standard milling taper on the
driving end and a threaded portion on the opposite
end to receive the arbor nut.

31. .
12
. sc
ew arbor
Screw arbors are used to hold small cutters that have
threaded holes.
.
13
. The slitting saw milling cutter
arbor
is a short arbor having two flanges between which the
milling cutter is secured by tightening
a clamping nut.

32. .
14
. the shell end milling cutting arbor
has a bore in the end in which shell end milling cutters
fit and are locked in place by means of a cap screw.
.
15
. the fly cutter arbor
is used to support a single-edge lathe, shaper,
Or planer cutter bit for boring and gear cutting
operations on the milling machine.

33. 2. Collets
Collets is a form of a sleeve bushing for reducing the
size of the hole in the milling machine spindle so that
small shank tools can be fitted into large spindle
recesses.
3. Chuck adapter
A chuck adapter is used to
attach chucks to milling
machines having a standard
spindle end

34. 4. Spindle adapter
A spindle adapter is a form of collets having a
standardized spindle end.

35. 5. Quick - change tooling
The quick-change adapter mounted on the spindle nose
is used to speed up tool changing.
Tool changing with this system allows you to set up a
number of milling operations such as drilling, end
milling, and boring without changing the Set up of the
part being machined.

36. METHODS OF
MOUNTING WORK
PIECES
1.Clamping Workpieces to the Table.
2.Clamping a Workpiece to the Angle Plate.
3.Clamping Workpieces in Fixtures.
4.Holding Workpieces between Centers.
5.Holding Workpieces in a Chuck.
6.Holding Workpieces in the Vise.