SYSTEM MAINTENANCE OF MACHINE COMPUTER NUMERICALLY CONTROLBY

YERRI ANANDA LEONARD LIESWAN

032 2011 0040

Definition of CNC machine

Computer Numerical Control (CNC) is one in which the functions and motions of a machine tool are controlled by means of a prepared program containing coded alphanumeric data. CNC can control the motions of the workpiece or tool, the input parameters such as feed, depth of cut, speed, and the functions such as turning spindle on/off, turning coolant on/off.

The application of CNC machine

The applications of CNC include both for machine tool as well as non-machine tool areas. In the machine tool category, CNC is widely used for lathe, drill press, milling machine, grinding unit, laser, sheet-metal press working machine, tube bending machine etc. Highly automated machine tools such as turning center and machining center which change the cutting tools automatically under CNC control have been developed. In the non-machine tool category, CNC applications include welding machines ,coordinate measuring machine, electronic assembly, tape laying and filament winding machines for composites etc.

Main part and function of CNC Machine

Motor Main DriveThe main motor is the motor of Chuck to rotate the workpiece. This motor is the motor type of direct current (DC) with variable speed, the identification of the motor is:

Qualification round 600 - 4000 rpm

Power input 500 watts

Energy expenditure / output of 300 watts

Tailstock

Tailstock is a machine tool used:

To support the long workpiece during slicing process takes place.

To clamp the center drill, drill, reamer, etc. at the time of manual working

Chuck

Chuck is used to clamp the workpiece during the ongoing process of slicing the workpiece is rotating chuck then connected directly to the main spindle drive motor through the belt. Due to its function as a clamp workpieces that varies in diameter,then to adjust the rotational speed used chuck belt transmission system.

Slidding bed

Machine table serves as a tool holder carriage, Tailstock and headstock. Tools sled and tailstock to glide on the machine table parallel to the main axis. In machine made very delicate thing to achieve accuracy at the time tooling sledding and sliding off the head, the machine table cleanliness must be maintained, because of damage to the machine table surface will affect the results of the workpiece.

Support

Support used for home chisel holder and determine the direction of motion incision. The direction of movement can be parallel slicing motion, perpendicular or oblique to the main axis. Direction of movement incision on CNC lathes TU - 2A is running motion machine that given the symbol as follows: support move parallel to the major axis given the symbol Z, the trajectory distance 0-300 mm. Sledge transverse movement perpendicular main axis given the symbol X, the trajectory distance 0-50 mm.

revolver/toolturret

House cutting tool on a lathe CNC TU-2A is used to clamp the cutting tool or chisel. House cutting tool can rotate 360 degrees so-called revolver / toolturret.

Monitor and Service switch dimensions

The service switch is used to set the dimensions of the workings of the machine services in mm or inches. The operation of the switch: The operator can choose the service dimension by turning the switch to the position in mm or inch For example: will work in mm then the switch is positioned on the dot mm.

• Step Motors

Step motors are the driving force for sledding longitudinal, transverse and house cutting tool. Type and size of each - each step motors are the same. Identification of step motors are: Number 1 round 72 step rotary moment of 0.5 Nm maximum movement speed faster movement of 700 mm / minutes.manual operation 5-400 mm / min Movement CNC programmed operation of 2-499 mm / min

Ammeter

Ammeter indicates the actual current consumption of the main engine. The main function ampermeter to prevent overloading when slicing underway. Maximum current allowed is 4 amps, while if the machine is used to work on - being should not exceed 2 amperes. Penyayatan load can be reduced by reducing the depth of incision, incision speed

•X and Z Axis button 

X- and Z buttons serve to move the tool carriage in the direction parallel to the main axis (Z) or transverse axis perpendicular to the main (X). In the service manual key X and Z axis can not be pressed simultaneously, but pressed one by one.

System Maintenanceno part schedule action tools

quantity duration remark

1 Motor Main driveevery 2

daysturn on the machines and warm it at least 2-5 minutes

- 12-5

minutes

2 tailstockevery 1 week take a grease to lubricate every section/component the tailstock

screwdriver+paintbrush 1

10-15 minutes

3 chuckevery 1 month

turn the machine on and take a grease to lubricate the chuck when rolling paintbrush 1

5-10 minutes

4 revolverevery 1 week

use the WD-40 to lubricate the component when the revolver rotating and and tighten it with screwdriver

paintbrush+screwdriver 1

5-10 minutes

5 sledding bedevery 1 week use the grease to lubricate the glider paintbrush 1

5-10 minutes

6 supportevery 2

days turn on the machines and warm it at least 2-5 minutes - 12-5

minutes

7monitor and service

witch dimensionevery 2

daysclean the dusty around the monitor and warm it when the

machine is on paintbrush 110-15

minutes

8 step motorsevery 1 week

use the WD-40 to lubricate the component when the revolver rotating and and tighten it with screwdriver

paintbrush+screwdriver 1

10-15 minutes

9 ammetersevery 2

days warm it when the machine is on and calibaration - 12-5

minutes

10 X and Z axis buttonevery 2

days clean the dusty around the button paintbrush 12-5

minutes