CNC

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Milling Machine

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GROUP 4

What is CNC machine ?

Definition

Generally, there are 2 kinds of CNC machineCNC Milling machine CNC Lathe machine

CNC milling machine

CNC milling machine is a milling machinewith movement of the table of machine (X andY axis) and spindle (the cutter) are controlledby a program.

The program contains commands that mustbe performed by CNC machines. It is made byPC plus special software to make the NCprogram. The program called CAM.

Kind of CNC milling

machineCNC milling 3A (3-axis) CNC milling 5A (5-axis)

Function of CNC milling

machineFunction of CNC milling

machine is same withfunction of conventionalmilling machine. Its workto make an object withcutting a workpiece by arotating cutter.

Difference :• CNC milling machine works automatically • Movement of cutter using program code

Principle and Operations

Output (Command Signal)

Input (Confirmation Signal)

As Input DataElectrical energy

• Numerical data and command code are distributed to control system as input data• The data is changed to command signal by control system• The command signal is distributed to electrical component• Electrical component gives confirmation signal to control system• The command signal is converted to electrical energy by electrical component• Electrical energy is distributed to mechanical component and it makes mechanical component move as command from control system.

Parts Of CNC milling

machineThere are 3 main parts of CNC milling machine

1. Mechanical component is movement componentin machine.

2. Electrical component is component which giveenergy to mechanical component to move ascommand from controller.

3. Controller is brain of CNC machine

Components Of CNC milling

machine1.Table of machine

2. Spindle

Components Of CNC milling

machine3. Monitor

4. Control Panel

Components Of CNC milling

machine5. Magazine tool

6. Coolant Hose

MaintenanceThere are some parts of the CNC milling

machine must be maintained regularly.

Ball screw lubricant

Pneumatic cylinder lubricant

Filter fan

Coolant tank

NEXT

Ball screw lubricant• Check oil on the lubricant tubeevery day• Ensure that the Lubricant mustbe distributed from the tube tothe table of machine• Use Vactra Oil no 2, ESSO K68,and Shell T68 to fill the lubricanttube

If the distribution system of lubricant having a problem, the table of machine will move without lubricant and it makes ball screw and

bearing were broken.

Pneumatic cylinder lubricant

• Check oil on the lubricanttube regularly.• Check the channel fromthe tube to anticipate leak.• Use hydraulic oil No.32

If the oil on the lubricant tube was empty , it makes the frictioned component is easy to corrosion and worn

Filter fan• Check and clean the filter fanfrom the dust every day.• Use the air gun to clean thefilter fan.

If to much dust on the filter, the fan will fail to cool the panel room and it makes hardware in panel room wiil overheat and be damaged

Coolant tank

If to much soft chip on the coolant tank, the drain out of the the coolant tank will clogged up and the coolant can’t out of the inlet

and it makes workpiece and cutter were broken

• Check quality and quantity ofthe coolant regularly (min. 2times in a month)

CNC milling safety• Use standard working clothes

• Use safety shoes and safety glasses

• Don’t approach the machine when auto toolchange is

• Don’t change tool when magazine tool isworking

• Don’t clean the table of machine when themachine is working.

• Don’t touch the chip without wearing gloves

• Don’t touch rotating parts of the machine

• Don’t use accessories

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