CNC Turning Programming Fundementalsls, Step by Step

7/25/2019 CNC Turning Programming Fundementalsls, Step by Step

1/14

CAD/CAM

LABORATORY

MEL58

RAMMING

FUNDA

MENTA

NC

PROCEDURE

The

following

are

he

basic

steps

n

NC

procedure

o

process

lanning

o

part

programming

o

Part

program

entry

o

Proving

the

part

program

o

Production

A) PROCESS

PLANNING

The

part

programmer

will

often

carryout

he

task

of

process

planning.

Process

lanning

is the procedure

of deciding

what

operations

are to

be done

on

the

component,

n

wtrat

ordef

and

with what

tooling

and

work

holding

facilities.

Both

the

proceis

planning

and part

programming

aspects

f manufacture

ccur

after

he

detail

drawings

of

a

component

ave

been

prepared.

The

following procedure

may

be used as

a

guide

to assist

the

programmer,

by

describing

each

step

equired

n

preoarins

he methodof nrocfirction

Dlng

eac

S

the method

o

tlon

l

PROCESS LANNING

o

Receive

he

part

drawing

from part

drawing

nformation,

check

suitability

of part

to be

machined

against

he

machine

capacity.

o

Determine

a

method

of

driving

the

component

chuck

type,

chuck

sir., typ.

or

jaw)

and the

method

of qachining.

Determine

he tooling

required

o

suit

the method

of

machining

and

utilize

as

much

as

possible

he

tools

which

are

permanently

n the

turret

set

upon

the

machine.

a

o

Determine

he

order

of machining

nd

he ooling

stations.

.

D;t"

operator

Determine

cutting

speeds

ased

on

-

Component

material,

method

of driving,

rigidity

of component

-

Tooling

selected

or roughing

and inishing

o

o

Determ

ne the

depths

of cr,4

and

feeds

or roughing

operations

o

Determine

surface

inish

requirements,

he cutter

nose

adius

most

suitecl

or

finishing

operations

nd

determine

eed

ates.

r

Allocates

ool

o&g 3s

required

.

Cqmplete

planning

sheet

ART PROGRA NG

o

After completing

he planning

sheet,

raw

he component

howing

he cutter

s

(a

simple

sketch

s

sufficient

or

simple

com

rts

to

be used.

lltlte

the

part

program

according

o the

sequence

f

operations.

DEPARTMENTOF MECHANICAL BNGINEERING,K.S.I.T, BANGALORE-62

42

Select

a component

datum

and carryout

he necessary

alculations

t slopes

and

Preparetool inglayoutsheeishowingtoolstobeusedi i r theff i

the

stationnumber

or

each

ool.


2/14

CAD/CAM

LABORATORY

MEL58

C) PART PROGRAM

ENTRY OR TAPE

PREPARATION

The

part program

is

prepared

punched

on

a

25 mm wide

paper

tape with 8 tracks and

is fed to

MCU in order to

produce

a component

of interest

on machine ool.

Other

forms

of

input

media include,

punched

cards,magnetic ape,

35 mm

motion

picture

film. The input

to

the NC system an be

n

two

ways : l)lv{anualdata

nput 2)Direct Numerical control.

1) Direct Data Inpu(MDI) : Completepart programsare entered nto CNC control unit via'

the console

keyboard. t is

suited

only for relativelysimple

obs.

The most common application

for MDI is the editing

of

part programs

already

esident

n

controllers

memory.

One

variation

of

MDI is a concept called

"Conversational Programming".

CNC

machinesare

programmed

via a

question

and

answer echnique

whereby

a resident

software

program

asks the operator a series of

questions.

n response o the operators nput,

and by

accessinq

rammed

data file, the

-

Select

numericalvalues or usewithin machining

calculations

-

Performcalculationso

optimize

machiningconditions

-

Identiff

standard

ools

and

coordinates

-

Calculate

utter

paths

and

coordinates

- Generate he oart Drosram o machine he comoonent

A typical

dialogue from

the

machinewould be as ollows

for the operator o identify such

things as :

-

Material to be cut

-

Surface oughnessolerance

-

Machined shape equired

-

Sizeof the

raw

material

blank

-

Machining allowances,

ut

directions

-

Tools

and

ool

detail

etc.

The operatormay then examine and

prove

the

program

via

computer

graphics

simulation

on

the

consoleVDU. After this, the program s storedor punchedon tape. Although there is some

sacrifice

in machine utilization, actual

programming time is minimal and much

tedious

production

engineeringwork is eliminated.

2) Direct Numerical Control : The

process

of transferring

part programs

nto

memcry

of

a

CNC

machine ool from a

host

computer

s

called

Direct

Numerical Control

or

DNC

D) PROVING PART PROGRAMS

It is

safe

practice

o check the

programmedpath for

any

interference

between he

tool

the work before using the

part program

or

production.

The

proving

part program

s done

o Visual inspection

.

Singlestepexecution

.

Dryrun

.

Graphicalsimulation.

Visual Inspection : It represents

he

method of checking

visually the

program present

n

the

memoryof the CNC machine. n

this, actual

program

s run and he

programmed

movements n

all

axesare to

be

checkedalong with ensuring he

tool offset and cutter compensationeatrrre.

This method epresentshe least orm of ver ification

and shouldnot be relied up on entirely.

DEPARTMENT OF MECHANICAL ENGINEERING,

K.S.I.T, BANGALORE-62

43

control can

and

by :


3/14

CAD/CAM

LABORATORY

MEL58

Single

Step

Execution

: Before

auto-running

he

part

program

t

should

be

executed

n

a

step

mode

.e

block

by block.

During

this

execution,

pindle

speed

and

feed

rate

override

acilities

are to

be

used

so that

axes

movement

can

be

easily

monitored.

This

operation

may

be

canied

out

with

or

without

mounting

the

component

on the machine.

Dry

run

: A

dry

run

consists

of running

the

part

program

in auto-mode.

During

this,

the

component

s not installedon the machine ableand the cutting is done n air. The purposeof

this run

is

to

verifu

the programmed

path

of the tool

under

continuous

operation

and

to

check

whether

adequate

clearance

exist

between

he

clamping

arrangement

and

other projections

within

the

set

up. Feed

ate

override

acilities

are used

o slow

down

the

speed

of

execution

of

the

program.

Graphical

simulation

: A

graphical

simulation

package

emulates

he

machine

ool

and,

using

computer

graphics,

plots

out

the

machine

movements

on a

VDU

screen.

Machine

,''ou.*.ni

often

takes

the

form

a cutting

tool

shape

moving

around

the

screen

according

to

the

programmed

movements.

When

the

tool

shapepasses

over

a

shaded

representation

f

the

component,

t

erases

hat

part

of the

component.

The

resulting

shape,

est

after

the

execution

representshe shapeof the finishedcomponent.Any grossdeviations rom the intended ool

path

can

be

observed

nd

any potential

nterferences

an

be highlighted.

PART

PROGRAMMING

GBOMETRY

A.

COORDINATE

SYSTBM

FOR

A

CNC LATHE.

Machining

of

a

workpiece

by

an NC program

equires

a

coordinate

ystem

o

be applied

o

the

machine

ool- As

all

machine

ools

have

more

han

one slide,

t

is important

hat

each

slide

is identified

ndividually.

There

are

two planes

n which

movements

an

akeplace

.

Longitudinal.

o

Transverse.

Eachplane

s

assigned

letterand s referred o asan axis.

o

Axis

X

.

Axis

Z

The

two

axis

are dentified

by

upper

caseX,Z

and he

direction

of movement

along

each

axis

(+)

or

(-).

The

Z axis

s always

parallel

o

the

main

spindle

of

the machine.

The

X

axis

s

alwaysparallel

o the

work

holding

surface,

nd alwiys

at right

angles

o the

Z

axis.

The

coordinate

ystem

or

tuming

operations

s

shown

n figure

below

:

DEPARTMENTOF'MECHANICAL ENGINBERING,K.S.I.T, BANGALORE-62

44


4/14

CAD/CAM

LABORATORY

MEL58

+

I

F i o 1 , C O B R D I N A T E Y S T E M

F O R

T U R N I N GO P E R A T I O N S

B. ZERO POINTS AND REFERENCE POINTS

All

CNC

machine tool

traversesare controlled

by coordinating systems.

Their accurate

positionwithin the

machine ool is

established y

"ZERO

POINTS".

MACHINE

ZERO

POINT

(M)

: is specifiedby

the manufacturer f

the machine.This is the

zero

point

for the

coordinate systems

and reference

points

in

the machine.

On

turning lathes,

the machine

zero

point

is

generally

at the center of

the spindle

nose ace. The main spindle axis

(center

ine) represents

he Z axis, the

face

determines

he

X axis.

The

directions

of the

positive

X and

Z

axes

point

toward

the working areaas

shown n

figure below:

WORKPIECE

ZERO POINT

(W)

: This

point

determines he

workpiece

coordinatesystem

in relation to the machine

zero

point.

The workpiece

zerc

pint

is

chosenby the

programmer

and

input into the CNC

systemwhen sett ing up

the machine.

The

position

of the

workpiece

zero

point

can be freely chosenby

the

programmerwithin the workpiece

envelopeof the machine. t

DEPARTMENTOF MECIIANICAL

ENGINEERING,K.S.I.T, BANGALORE-62

45

NE ZERtr PI INT

W RKP] I C f ZERD PNINT

RfF fRfNCE

PI INT


5/14

CAD/CAM

LABORATORY

MEL58

is however

advisable

o

place

the

workpiece

zero point

in

such

a

manner

hat

the

dimensions

n

the

workpiece

drawing

can

be

conveniently

coni'erted

into

coordinate

values

and

orientation

when

clamping

1

chucking,

setting

up

and

checking,

the

traverse

measuring

system

can

be

effected

easily.

For

turned parts,

the

workpiece

zero

point

should

be

placed

along

the

spindle

axis

(center

ine),

in

line

with

the

right

iand

or left

hand

encl

ace

of the

finished

contour

as shown

in figure.Occasionallyheworkpiecezeropoint is also called he "programzero point.',

'

REFERNCE

POINT (

R)

: This point

serves

or

calibrating

and

for

controllingthe

measuring

system

of the

slides

and

tool

traverses.

he position

of theieference

point

as

,ho*.,

in

figur

below

is

accurately

predetermined

n

every

traverse

axis

by

the

trip

dogs

and

limit

switches.

Therefore,

he

reference

point

coordinates

lways

have the

same precisely

known

numerical

value

in

relation

to

the

machine

zero

point.

After

initiating

the

control

.yrt.-,

the

reference

point

must

always

be approached

rom

all

axes

to calibrate

he

traverse

measuring

ystem.

f

current

slide

and ool position

data

should

be

lost

in

the

control

system

as

for."urr1pt.,

through

an

electrical

ailure,

he

machine

must

again

be

positioned

o

the reference

oint

to

re-establish

the

proper

positioning

values.

C. NC- RELATED DIMENSIONING

Dimensional

nformation

in

a

workpiece

drawing

can

be

stated

n

two

ways

:

Flg

A.

Absotu te

Dlnenslons

o

e o

o

50

o

3 0

o

- 2 n

- 7 0

Incremento. (

d lnens lons

F IE

E.

l nc r ^emen ta l

I J l r nens lons

Inc remen ta t

Coo rd lna tes

l.Absolute

Dimension

System:

Data

in

absolute

dimension

system

always

refer

to

a fixed

reference

oint

in

the

drawing

as

shown

in

figure

A above.

This point

has

the

function

of

a

coordinate

ero point

as n

figure

B.

The

dimension

ines

run parallel

o

the

coordinate

xes

and

always

start

at

the

reference

point.

Absolute

dimensions

are

also

called

as

,.Reference

dimensions".

2.

Incremental

Dimension

System:

When

using

incremental

dimension

system,

every

measurement

efers

to

a

previously

dimensioned

position

as

shown

in

figure

A

below.

P1

P 2

P 3

F 4

P 5

F6

P7

PE

P 9

DEPARTMENTOF MECHANICAL ENGINEERING,K.S.I.T, BANGALORE-62

46


6/14

CAD/CAM LABORATORY

MBL58

Incremental dimensions are distance

between adjacent

points.

These distances

are converted

into incremental oordinates

y accepting he

last

dimension

point

as the coordinate

origin for

the

new

point.

This may be compared o

a small

coordinatesystem, .e.

shifted consequently

frorn

point

to

point

as shown in figurer

B. Incremental

dimensions

are also frequently

called

"Relative

dimensions"

or

"Chain

dimensions".

NC PROGRAMBUILD UP

In an NC

program

he machining

steps

Operations)

or

producing

a

part

on

the machine

tool are aid down in

a form that the control

system an

understand.

program

s

composed

f

severalblocks. A block is a collection

of NC words.

An

NC word is a collection

of

address

letterand

f numbers.Table

shows

he

address

ette

s e

oI num

e rS :

Address

Characters

Character

Meaning

A

Rotationabout.

X-axrs

B

Rotation bout,Y-axrs

C

Rotation about, Z-axrs

D&E

Rotationaboutadditional xis

F

Feed

G

Preparatory

unction,

dentifuine

he action o

be

executed

I

Interpolation

parameter

Thread

pitch parallel

o X-axis.

J

Thread

pitch parallel

o Y-axis

K

Thread

pitch parallel

o

Y-axis

M

Auxiliarv function

N Block Number

P,Q,R

Threadmovement

parallel

o

X,Y,Z

axis respectively.

P

&

Q

are also usedas

parameters

n

cycles.

S

Spindlespeed

T

Tool

U.V.W

Secondmovement

parallel

o X,Y,Z axis respectively

X

Movement n X-axis

Y

Movement n

Y-axis

Z

Movement n Z-axis

All the NC words

may not be used

on

every

CNC machine.Using these

words

as an

assembleds ollows:

xample, he com tion

of

a block is

PART PROGRAMFORMATS

The order n which these

words appear n a block of instructions s called

Basically

hereare wo types

of

format:

.

Fixed Block Format

-Fixed

sequential ormat

-Tab

sequential

ormat

.

Word AddressFormat

the

format.

DEPARTMENTOF MECIIANICAL ENGINEERING.K.S.I.T. BANGALORE-62

47


7/14

CAD/CAM

LABORATORY

MEL58

I. FIXED BLOCK

FORMAT

:

a)Fixed

Sequential Format

: Every instruction

containsall

the words

in the

same

sequence

irrespective

of the

words

being

the

same as in the

previous

blocks.

Hence

the identifuing

address etter

need

not be

provided.

For

example,

f

some coordinate

values

remain

constant

from

one block

to next

block these

valueshave

o be specified n

the next

block

also. The

data

must

be

input

in a

specified

sequence

nd characterswithin

each word

must

be of the

same

length.

'

Example

N0l0

G00X10 Z0 F60

5800EOB

N020cOl

x20 20F60

s800EoB

b)Tab Sequential

Format

: The words

n each nstruction

block are

always

provided

n

the

same

sequence

but

each word

is

preceded

by the TAB

character.

f instructions

remain

unchangedn

succeeding

locks,

he instructions

eednot

be repeated

ut TAB

character

must

be

punched.

Here also,

he identifuing

etteraddress

eednot be

em

2.

WORD

ADDRESS

FORMAT:

Each word

is

preceded

nd dentified

by its

letter

address.

This

format

enables nstructions

which

remain unchanged

rom

the

preceding

block,

to be

omitted from succeedingblocks. This system speedsprogramming,

and tape

lengths

are

considerably

educed.

This

is the format

adoptedby most

CNC machine

control

units.

Detailed

format

classification

s

provided

by the

control

systemmanufacturer.

FANUC

TURNING

PROGRAMMING

MISCELLANEOUS

FUNCTION

(M

Codes)

M

Codesare nstructions

describing

machine unctions

such as

calling the

tool,

spindle

rotation,

coolant

on,

door cl


8/14

CAD/CAM LABORATORY

MEL58

M00 PROGRAM

STOP

:

By

inserting

M00 in a

program,

he cutting

cycle

is

stopped

after

the

block containing

M00 code.

This

faciliW s useful f an

nspection

check s

necessary

uring

an operation.

The cycle

is then continued

by a cycle start.

M01 OPTIONAL

STOP : Cycle

operation is

stopped after

a block

containing

MOl

is

executed.This

code is

only effective rvhen

he optional

stop switch

on the

machine

control

panelhasbeenpressed.

M02 PROGRAM

BND

: This code

s insertedat

the end

of the

program,

when

encountered

the cycle will end.

To

produce

another,

he

systemmust be reset.

M03 SPINDLE

FORWARD

: Starts

the spindle

spinning forward,

clockwise

or

negative

direction

at the last

specified

spindle ate.

M04

SPINDLE

REVERSE

: Starts

he spindlespinning

everse,

ounter

clockwise

or

positive

directionat the

last

specifiedspindle

ate.

M05 STOP SPINDLE : Stops hespindlewithout changing he spindlespeed.

M06 TOOL

CHANGE

: The M06

in conjunction

with

"T"

word is

used

o call up

the

required

tool on an automatic

ndexing

turret

machine,

and to activate

ts tool

offsets.

The left

most

digit

of the

"T"

ignoring zeros,

Selects he new

tool. Tool changes

re normally performed

with the

tool

post

at a safe

position

away from the

workpiece,

so the

code G28

REFERENCE

POINT

RETURN

would

be used n

the block

prior

to M06.

M08 COOLANT

ON : Turns he

coolant

on.

M09

COOLANT

OFF

: Turns he

coolant

off.

MlO

CHUCK OPEN

:

Opens

pneumatic

or similar

automaticchuck

to allow

for bar

feed.

Mll CHUCK

CLOSE

: Closes

hechuck.

Ml3

SPINDLE FORWARD,

COOLANT

ON : Sets

spindle rotation

forward

and

sets

he

coolant

on, both are

performed

by

singlecode.

M14

SPINDLE

RBVERSE,

COOLANT

ON

:

Sets he

spindle rotation

n reverse

direction

andsets

he coolant

on.

M30 PROGRAM END : Stops the spindle, urns the coolant off, terminatesand resets he

CNC

program.

M38

DOOR

OPEN :

Opens he door, waiting

until

the door is

open.

M39 DOOR

CLOSE :

Cioses he

door, waiting

until the door

is closed.

DEPARTMENTOF

MECHANICAL

ENGINEERING,

K.S.I.T.

BANGALORE-62

49


9/14


10/14

CAD/CAM

LABORATORY

MEL58

GOl

LINEAR

MOTION

Description

Illustration

G01 traverses

he

tool

along

a linear

path

o

the

given

target point

rvith

the feed

rate

input

as

a

supplementary

function.

The

feed rate determines he speedwith which

the

workpiece

s

machined.

The

choice

of

feed rate

depends

on

the

tool,

the material

being machined,

he

required

surface

inish

and

the drive

rating

and rigidity

of

the

machine

ool.

When

giving

the instructions

G0l,

the

coordinates

f the

destination

point

can

be

expressed

using

either

absolute

or

incremental

imensions.

Example

GOl

X30 Zl0

F100

51000

TargetpointFee4 Speed

GO4DWELL

Description

Illustration

A

G04 causes

the

program

to

wait

for

a specified

amount

of time.

The

time

can

be specified

in

seconds

with the "X"

or

"IJ" prefixes

or

in

milliseconds

with

the

"P" prefix.

A G04

code

can

be inserted

between

he

two

statements

o make

a

sharp

corner.

G04

G04

G04

x1.5

u l .5

Pls00

G20 INCH DATA INPUT : A G20causesositiono beas being n imperialunits.

input

values

re n

inches.

This

can

only

be

at the start

of the

main

program.

G21 METRIC

DATA

INPUT

:

A G21

causes

ositions

o

be interpreted

s

being

n

units.

All

the nput

values

re n

mm.This

can

only beat the

start

of the

main

program.

G28

REFERENCE

POINT

RETURN

All the

_

metric

DEPARTMENTOF MECHANICAL

ENGINEERJNG,

K.S.I.T,

BANGALORE.62

5I

Description

Illustration

A

G28 causes

a fast

traverse

to the

specified

position

and hen

to the

machine

datum.

G28X35

Z5

G28U0

W0


11/14

CAD/CAM

LABORATORY

MEL58

G4t,C42

TOOL

NOSE

RADIUS

COMPENSATION

GsO

COORDINATE

SETTING

Descrintion

onModernCNCmachines,specialcalculationfu"ctionso.cutG@

codes

re

provided

o

allow

a

user

o

utilizepartprofile

coorCinates

btainable

iom

the

part

drawing

o

program

a contouring

motion.

These

are

he

G41

and

G42

codes

or

tool

radius

compensation

on

the

left

and

right

hand

sides

of a profile.

A left

or

right

compensations basedon the fact that he tool is on left or right handsidewhenone goes

along

he part

profile

in

the

direction

specified

by the

contouring

motion

statements

n

the

am.

A

G40

code

s

provided

to

cancel

he

cutter

radius

com

G50 enables

ool

nose

adius

co*pensat

uses.

coordinate

setting

block

has "x","2","u",

or "w"

upon

it.

A maximum

spindle

block

does

not

have

all

these.

n

The cutting speedduring turning is the

t;

speed

s

a rotating

work

represents

heperipheral

ath

n

a

given

unit

time

as

shown

n

figure'

The

peripheral

speed

or cutting

speed

s

thus

the

fully

stretched

chip

length

produced

n

one

time.

The

cutting

speeds

ary

in

direct

relation

o

the

diameters,

ven

f

the

number

of revolutions

per

minute

s the

same

n all

cases.

The

correct

selection

of the

cutting

speed

or

turning

s

very important,

Cutting

speed

oo

low

: Time

loss

and

ow

surface

inish.

With

increasing

utting

speed

the

surface

peed

s

improved.

Cutting

speed

oo

hiqh

:

Hish

tool

wear.

G96

CONSTANT

SURFACE

SPEED

G98

FEED

PER

MINUTE

:

Description

Illustration

This

command

coupled

with

the

F

word

is

used

o

speci$,

feed

rate per

minute.

This

can

be n

either

mm/min

or inch/min.

his

is

the

default.

F=nisp lncement

o{ong

the

Z

qxis

per

minu te

DEPARTMENTOF MECHANICAL ENGINEERING,K.S.I.T,

BANGALORE-62

52

NORMAL SPINDLESPEED

G97

cancels

constant

surface

speed.

The

spind

value

s reached.


12/14

CAD/CAM LABORATORY

MEL58

G99FEED

PER REVOLUTION

Descrintion

This command

coupled

with the F word

is

used

to

speciff a feed rate

per

revolution. This

can

be in mrn/rev

or inch/rev. the feed

rates

available n

the machine

simulation are

0.01-

200 mm/min. Recommended feed rates are

published

by tool and

cutter manufacturers,

along with recommended

utting

speeds. f the

feed rate is expressed

as mm/rev,

a

simple

calculation an

be used

o convert o mm/min.

FEED, mm/min:FEED(mm/rev)

X

spindle

speed(r.p.m)

PROGRAM

BUILD.UP

FOR

CNC

LATHE

(FANUC)

CNC

program

can

be

divided

nto

3

parts,

Start-up,Body and End of the program.

START-UP OF

CNC PROGRAM

or000

IBTLLET

20 260

G2r/G20G98/G99 40

G50S1800

G28U0 W0

M06

T0101

M03/M04

1000

G00x2rr

EXPLANATION

o1000

While writing

a

program

on FANUC controller

irst line

has

o be

started

with letter

'O'

followed by four digit number which

specifies he

program

name.

IBTLLET

X20 260

This directive

is

used only

for simulation

purpose.

t defines

he

work

piece

dimensions s

60

mm long

and 20 mm in

diameter.

G2uG20G98/G99

G40

G2l

-

code

specifies hat

program

s

done n metric units.

G20

-

code

specifies

hat

program

s done n imperial

units

G98

-

gives

he

unit of feed n mm/minute.

G99

-

gives

he unit

of

feed

n mm/revolution.

G40

-

Compensation

ancel.

G50S1800

Clamps he

spindle

peed

t 1800 pm.

G28

U0 W0

Makes

he tool to

go

to

home

position.

U & W are

Secondary

movements boutX and Z axis.

M06

T0101

Tool change

The first

two digits

specify he tool

position

n

the turret and

ast

two

digits denotes

he tool

offset

number.

M03/fi404

1000

G00

2r z1

M03- makes

he

spindle otate n clock'wise

irection.

M04

-

makes he

spindle otate n counter-clockwise

irection.

S1000-Spindle

otates

t 1000 pm.

G00

gives

rapid

position

of the tool

to a

point

X2l Zl which

is

iust

above he

billet. This

point

is cailedas

he tool entrv

ooint.

DEPARTMENTOF MECHANICAL ENGINEERING.

K.S.I.T. BANGALORE-62

53

Illustration

F=IJlspto.cer'1ent

,[ong

the

Z oxls

per^ nevotr- l t lon of

the workplec


13/14

CAD/CAM

LABORATORY

MEL58

METAL

N

BILLET

MATERIAL

:

Aluminum

BODY

OF

THE

PROGRAM

:

This

s

dealr

operation

ise

END

OF

THE

PROGRAM

:

G28

U0

w0

M05

M02t30

in

the

succeeding

ages.

FOR

ART

SIMPLE

FACING

for

Simple

Facing

Operafion

for

the

component

hown

n

2 nrnr or fACING

t l

t l

tF-

t l

t l

DWG.NO.

Write

a

manual

part

program

figure

below.

' l

f i?

SL.NO

0peration

Simple

Faci

EXPLANA

G28

U0

W0

Makes

the

tool

to

go

to

ho

movements

bout

X

and

Z

axis.

Stopr

he

spind

M02

-

Optionu

M30

-

Program

top

and

ewind.

M0s

M02/30

OPERATIONS F'EED

mm/min

TURI\ING

0.25-0.5

THREADING

PLANNING

ND

Opnnnrtor,ls

sunnr

BILLET

SIZE

z

22

x

60

MATERIAL:

Aluminum

PROGRAM

NO

: t00l

DWGNO:1

SDJCR

t2t2llll

DEPARTMENTOF MECHANICAL ENGINEERING,

K.S.I.T,

BANGALORE-62

54


14/14

CAD/CAM LABORATORY

MEL58

TOOL

OFFSETSHEET

Tool offsetNo.

Compensations,

mm

Toolnose

Radius. mm

Standard

Tool

Number

X

Z R

I

0.4

{

(Drawing

No .1

(CNC

program

or

Simple Facing

(Material

o

be

removed

by facing :2mm

o l00 l

ProgramNumber 1001

[BILLET

X22

260

DefiningBillet sizedia : 22length

60 mm

G2l

G98

G28U0

W0

M06T0303

M03S1200

G00 22zr

GOl

z-0.5F4s

GOI

XO

GOIZI

G00 22

G}l z-r F45

GOI

XO

GOI

ZT

G00 22

G}r

-r.5

GOIXO

GOI

ZI

G00

22

G0rz-2

GOIXO

GOI

ZI

G00x22

G28U0 W0

M05

M30

Initial settings

Going

o

home

position

Selecting

Tool No.

3

with

offset No. 3

Setting pindle peed

t

1200 pm

Tool moving to tool entry

point

X22 Zl at

rapid raverse.

Giving depth

of cut

of 0.5 mm at

a

feed

rate

of

45 mm/min.

Moving the tool to spindle

center ine

Retractback

the

tool

Moving the tool to X22

Giving

the seconddepth of cut.

Retractback

he

tool

Going

o home

position

Stop

he

spindle

Proqram

top

and rewind.

DEPARTMENT

OF

MECHANICAL

ENGINEERING,

K.S.I.T.

BANGALORE-62

Documents

CNC Turning Programming Fundementalsls, Step by Step