CNC Turning

Module 3: CNC Turning Machine

Watch the following video

Module Objectives

Describe the main parts of the EMCO CNC turning machine. Operate the EMCO CNC turning machine. Identify the main reference points on the EMCO CNC

turning machine. Distinguish the main control keys and their functions. Run the spindle of the Emco machine to a specific speed. Reference the machine in X and Z. Select the proper mode to move the tool turret in X and Z. Set the required tool in the active position. Decrease/Increase the feed rate in a specific percentage.

Main parts of the Turning (Lathe) machine

Main parts of the Turning (Lathe) machine:

Main parts of the Turning (Lathe) machine:

Points on the CNC Machine

Points on the CNC Machine

Work piece Zero Point

Tool Holder Zero PointReference

Zero Point

Machine Zero Point

Switching the Machine ON and OFF

To switch the machine ON:

- Open air supply-Switch on the main switch at the E-cabinet

- Turn on the PC

- Launch Control Software

- Open and close the chip guard door once for checking the door safety switch

To switch the machine OFF:

- Terminate control software

- Terminate Windows

- Switch off main switch

- Lock air supply

Main Control Keys

Machine control keyboard:

Machine control keyboard of the EMCO PC-Turn Series

Machine control keyboard of the EMCO PC-Turn Series

Skip blocks will not be executed

Machine control keyboard of the EMCO PC-Turn Series

Test run of programs, in which the program will run while the spindle is not rotating and there is no workpiece in the clamping device.

Machine control keyboard of the EMCO PC-Turn Series

Reset

Machine control keyboard of the EMCO PC-Turn Series

Stop the program

Machine control keyboard of the EMCO PC-Turn Series

Start the program

Machine control keyboard of the EMCO PC-Turn Series

Manual axis direction movement

Machine control keyboard of the EMCO PC-Turn Series

Approaching the reference point in all axes

Machine control keyboard of the EMCO PC-Turn Series

Open / Close door

Machine control keyboard of the EMCO PC-Turn Series

Open / Close clamping device

Machine control keyboard of the EMCO PC-Turn Series

Swivel tool turret

Machine control keyboard of the EMCO PC-Turn Series

Coolant/ Puff Blowing On / Off

Machine control keyboard of the EMCO PC-Turn Series

Spindle speed override (increase or decrease the spindle speed)

Machine control keyboard of the EMCO PC-Turn Series

Feed override switch (increase or decrease the feed rate)

Machine control keyboard of the EMCO PC-Turn Series

Mode selector provides several operating modes :

REF, MEM, EDIT, MDI, JOG, and INC mode

Machine control keyboard of the EMCO PC-Turn Series

REF: Referencing

Manual referencing

- Press the –Z or +Z key: the slide traverses to the reference point in Z.

- Press the -X or +X key: the slide traverses to the reference point in X.

Machine control keyboard of the EMCO PC-Turn Series

REF: Referencing

Automatic referencing:

- Select REF Mode:

- Press the reference key :

The slides traverse to the reference point in both axis, one after the other.

Machine control keyboard of the EMCO PC-Turn Series

MEM (Memory Mode): To run the program in automatic mode.

Machine control keyboard of the EMCO PC-Turn Series

EDIT: Allows the addition, modification, and deletion of programs.

Machine control keyboard of the EMCO PC-Turn Series

MDI: (Manual Data Input): Is used when the user wishes to manually input program commands into the system.

The programs are typed directly into the system via MDI keypad.

Examples

To run the spindle at 1000 RPM in clockwise direction

Example solution

Close the door

Select MDI mode

Press the [PROG] from function keys

Use Data Input Keys to write the following block:

S1000 M3 (then press INPUT key)

Press Start

Press reset to stop the program

Example solution

Press POS

•JOG: In this mode the slides can be moved in one axis at a time by use of the Axis Direction Keys.

•INC (Incremental): In this mode the slides can be moved certain distances in micron.

NotesThe machine is switched off by means of the main switch. It is recommended to switch off the machine only in inoperative position of the tool turret.

Operation is interrupted by means of the reset key.

All current machine functions are interrupted with RESET.

Function Keys

Function Keys

Function Keys enable the user to know the current positions of the tool, deal with programs, make the necessary setting e.g workpiece and tool settings, control program simulation, .… etc.

Data Input keys

Data input keys

Data input keys runs several functions (numbers, address characters).

Machine Practical Tasks

(Before performing these tasks, the tools on the turret should be checked for any expected collision with the chuck)

Machine Task 1

Select Reference mode (door closed/Chuck closed) Reference the machine in XReference the machine in ZOpen the doorClose the doorOpen the doorOpen / close the chuckSelect “JOG” modeIncrease the feed rate to 110% (Use feed rate override)Decrease the feed rate to 90%Move the turret in positive Z

Machine Task 1

Check the tools on the turret for any expected collision, then Rotate

the turret to make tool number 5 active.Decrease the feed rate to 20%Move the turret in negative Z Increase the feed rate to 100%Move the turret in positive ZMove the turret in negative XMove the turret in positive X

Machine Task 1

Switch coolant (air) ONSwitch coolant OFFSelect reference mode “press automatic referencing button”

Machine Task 2

Machine Task 2

Select JOG mode Move the turret in positive Z Adjust the feed rate to 80% Move the turret in negative Z Move the turret in positive Z Move the turret in positive X Move the turret in negative X Select MDI mode (While door is closed) On (Function Keys), Press “Program” Use the (The data input keys) to write “S1500 M3” then

press “INPUT”

Machine Task 2

Press “Start program” Increase the speed to 120% Decrease the speed to 80% Set speed to 1000 RPM (100%) Stop the program (Reset) Press POS Select Jog mode Move the turret in positive Z Select MDI mode (While door is closed) On (Function Keys), Press “Program”

Machine Task 2

Write T0303, then press INPUT (Check the turret for any possible tool collision with the chuck)

start the program Stop the program (Reset) Select tool no.7 to be the active tool, then press “reset” Press POS. Select Reference mode Reference the machine in X Reference the machine in Z”

Practical Tasks on MTS

MTS Tasks 1

Use MTS software to create a setup sheet and write a part program to do the finishing part shown below.

It is advised to consider the depth of cut = 1 mm, this means the reduction of diameter from 40 to 30 mm will be done through 5 steps of cutting. The diameter will be reduced to 38, 36, 34, 32 and finally to 30 mm).

MTS Tasks 1

MTS Tasks 2

Use MTS software to create a setup sheet and write a part program to do the finishing part shown below.

MTS Tasks 2

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