cnc lab report

7/25/2019 cnc lab report

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MANUFACTURING LAB

A Report on CNC Machine Operations

Prepared By : Submitted To :

Upendra Ajit Singh r! Abhay Sharma

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Contents

Aim (

Theory (

")perimenta* Setup '

Procedure '

Resu*ts +

Precautions ,

A-M

To per.orm dri**ing/ pro.i*ing and poc0eting operations on a CNC Machine!

T%"OR1

CNC is the short .orm .or Computer Numerica* Contro*! The CNC machine

comprises o. the mini computer or the microcomputer that acts as the contro**er unit

o. the machine!

-n CNC machines the program o. instructions is .ed direct*y into the computer

2ia a sma** board simi*ar to the traditiona* 0eyboard! The program is stored in the

memory o. the computer! The programmer can easi*y 3rite the codes and edit the

programs as per the re4uirements! These programs can be used .or di..erent parts/ andthey don5t ha2e to be repeated again and again!

The main purpose o. these machines is to remo2e some o. the meta* so as to

gi2e it proper shape such as round/ rectangu*ar/ etc! -n the CNC machines the ro*e o.

the operators is minimi6ed! The operator has to mere*y .eed the program o.

instructions in the computer/ *oad the re4uired too*s in the machine/ and rest o. the

3or0 is done by the computer automatica**y!

Too*s that can be contro**ed in this manner inc*ude *athes/ mi**s/ routers and

grinders! A computer program is customi6ed .or an object and the machines areprogrammed 3ith CNC machining *anguage 7ca**ed 89code that essentia**y contro*s

a** .eatures *i0e .eed rate/ coordination/ *ocation and speeds! ;ith CNC machining/ the


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computer can contro* e)act positioning and 2e*ocity! CNC machine a*so has its

appropriate programmab*e accessories/ some e)amp*es o. 3hich are machining

centres/ automatic too* changer/ spind*e speed and acti2ation/ Coo*ant etc!

Ad2antages

a! Accuracy

;hen programmed correct*y/ CNC machines produce parts to ma)imise

accuracy/ pro2ide good positiona* accuracy and repeatabi*ity/ pro2ide a high

degree o. 4ua*ity because o. their accuracy and their abi*ity to reuse programs!

b! Simp*icity

CNC machines are not a** that di..icu*t to use once you *earn ho3!


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c! Time

Using CNC machines e..ecti2e*y reduces the amount o. time ta0en!

isad2antages

a! Cost

Costs 4uite a *ot more than con2entiona* machinery and does not

e*iminate the need .or e)pensi2e too*s!

")perimenta* Setup

Too* ho*der;or0 ho*ding 2ise

ri** bit 7#& mm dia

"dge .inder

;or0 piece 7#&< mm ) +& mm

Procedure

#! S3itch on the MCB 7Machine Contro* Board/ Machine Po3er and Air

Compressor!


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To measure the ;or0 Coordinates

D! Bring a** a)es to the centre position using ?oy Stic0! Se*ect M- mode to 3rite

program .or spind*e rotation by pressing Program 0ey on 0eyboard! ;rite

M(S#&&& and press -NS"RT! Press Cyc*e Start ON 7Spind*e 3i** startrotating!

+! Eocate the desired origin on the 3or0piece using ?oy Stic0 and mo2e the > a)is

to touch the 3or0piece sur.ace!

To measure 8$' .or =/ 1 and > a)is

,! Type >& and press M"ASUR" in the .unction 0eys! Repeat the same .or =&

and 1&!

To 3rite and run manua* program on CNC Machine

#&! Se*ect "-T mode in Mode Se*ector and press Program 0ey on the 0eyboard!

##!Se*ect -R using .unction 0eys!

#

program number! 7")! O&&&D Press O9SR%

#(! Type the a2ai*ab*e program number and press B89"-T to 3rite ne3 program!

#'! Press B89"N a.ter comp*etion o. the program!#$! Se*ect AUTO mode to run the program! Press Cyc*e Start ON to start the

program e)ecution!

Mounting the 3or0piece and too* ho*der

#! Mount the 3or0piece on the 3or0 ho*ding 2ise by tightening the cre3!

#D!Attach the too* by tightening it on the too* ho*der! Push the button Too* e9

C*amp/ insert the ho*der in the space/ the machine 3i** grab the too* ho*der!

One may a*so use automatic too* changer by 3riting a too* change 89Code!

Per.orming the operation

#+!8o to the program 3ritten .or the respecti2e operation and per.orm the steps

mentioned ear*ier to run the program!

#,! To use the edge .inder/ mount it in the too* ho*der! Ma0e a contact bet3een

edge .inder and the 3or0piece edge using ?oy Stic0 3hi*e the spind*e is

rotating! -nitia**y edge .inder 3i** ha2e an eccentric rotation! Adjust the edge

contact ti** the rotation o. edge .inder is no more eccentric but per.ect*y

coa)ia*!


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To Turn O@@ the CNC Machine


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7

M,+ P&D E#&F

8& 8+& >$&F

M&$F

M&,F

8& 8,# 8&F

8& 89&!< @& @$&&F

M,+ P## E#&F

8& 8+& >$&F

M&$F

M&,F


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8& 8,# 8&F

8& 89&!< @#&F

8 8,& 8$' 8'< =$

@$&&F 19$F

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Resu*ts

ri**ing Operation

@igure #: #& mm dia ho*es p*aced $& mm apart


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Pro.i*ing Operation

@igure machine operation!

3. %and*e ?O8 mode care.u**y! Mo2ing a)es in ?O8 #&&& shou*d be a2oided!

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