Cnc milling turning Mechanical Engineering 00923006902338

2. Presented by
Salman Jailani
DEPARTMENT OF MECHANICAL ENGINEERING
Presentation on

3. Contents
 Special features of CNC Turning and Milling
centers
 Classification of CNC Machining centres
 Configuration of CNC Machine control unit
 Advantages of CNC Turning and Milling
centres
 Introduction to CNC, Turning and Milling
operations

4. CNC:-
It indicates “Computer and Numerically controlled”, It is defined
“Automation of machine tools operated by precisely programmed
commands with computer playing important role of control ”
Milling:-
Milling is a machining operation of producing flat, helical surfaces
means of multiple cutting edged rotating tools called “Milling
Cutters”. After the advent of computer numerical control (CNC),
milling machines evolved into milling machining centers

5. CNC LATHE or CNC TURNING CENTER

6. Automatic tool changer :-
The tools are contained in a storage unit that is integrated with the
machine tool. When a cutter needs to be changed, the tool drum rotates
to the proper position and an automatic tool changer (ATC) operating
under program control.
Automatic work part positioner :-
Many horizontal and vertical machining centers have the capability to
orient the work part relative to the spindle. This is accomplished by
means of a rotary table on which work part is fixtured. The table can
be oriented at any angle about a vertical axis to permit the cutting tool
to access almost the entire surface of the part in a single setup.

8. CNC milling is a specific form of
computer numerical controlled (CNC)
machining. Milling itself is a machining
process similar to both drilling and
cutting, and able to achieve many of the
operations performed by cutting and
drilling machines. Like drilling, milling
uses a rotating cylindrical cutting tool.

9. Example of CNC Milling program:

11. CNC Milling Program Final Product

12.  Aluminum Carbon Steel
 Stainless Steel
 Titanium
 Brass
 Copper
 Fiberglass
 Magnesium
 Plastic
 Plasticized Woods
 Foam

13. CNC Turning is manufacturing process in which a
round(cylindrical) material is held in a chuck and
rotated while a tool is fed to the piece to remove
material to create the desired shape. CNC lathes or
turning centers have tooling mounted on a turret
which is computer-controlled. CNC’s with “live”
tooling

14.  Designed mainly for machining shaft-type work pieces
supported by chuck and heavy-duty tailstock center
 On four-axis machines, two opposed turrets, mounted
on separate cross-slides
 One above and one below center line of work
 Balance cutting forces so extremely heavy cuts can
be taken on work piece

15.  Steady rest
◦ Allow facing and threading on end of shafts
 Follower rest
◦ Used to support long, thin shafts
 Bar-feeding mechanism
◦ Permits machining of shafts and parts from
bar stock smaller than spindle through-hole
 Production part loader
◦ Can complete part changeover when
individual precut shafts machined

16.  Reduced lead time
 Elimination of operator errors
 Less Operator activity
 Less Labor Cost
 Longer Tool Life
 Elimination of special Jigs and
Fixtures
 Flexibility in changes of product
design
 Reduced inspection
 Reduced Scrap
 Accurate costing and scheduling

17. Information source:Reference websites:
www.wikipedia.com/metal lathe
www.elearning.vtu.ac.in