s SUMMER TRAINING PRESENTATION

ON

SUMMER TRAINING PRESENTATION

ON CNC MACHINE UNIVERSAL TESTING M/C

Submitted To Submitted by Mr. Ajay Kumar Ehtesham Habeeb

(1202940069)

History

The first NC machines were built in the 1950s by Prof. John T Parson.

CNC machine came into existence after evolution of computer around 1980.

Modern CNC Machine are improving further as the technology is changing with a variety of functions according to applications.

*Features of CNC Machinery

*The tool or material moves automatically.*Larger machines have a machine control unit (MCU)

which manages operations.*Movement is controlled by motors (actuators).*Feedback is provided by sensors (transducers)*Tool magazines are used to change tools automatically.

*CNC programmingImportant things to know:

*Coordinate System

*Units, incremental or absolute positioning

*Coordinates: X,Y,Z, RX,RY,RZ

*Feed rate and spindle speed

*Coolant Control: On/Off, Flood, Mist

*Tool Control: Tool and tool parameters

Programming consists of a seriesof instructions in form of letter codes

•Preparatory Codes: G codes- Initial machining setup and establishing operating conditionsN codes- specify program line numberto executed by the MCU

•Axis Codes: X,Y,Z Used to specify motion of the slide alongX, Y, Z direction

•Feed and Speed Codes: F and SSpecify feed and spindle speed

•Tool codes: T – specify tool number

•Miscellaneous codes – M codes For coolant control and other activities

Question

ProgramN10 G90 G92;N15 T0202;N20 S1200 M03;N25 G00 X 10 Z 2;N35 G73 P40 Q70 W 0.1 F 0.2;N40 G01 X 10 Z 0;N45 Z -15;N50 G03 X 12 Z -16 R 1;N55 G01 Z -35;

N60 X 14 Z -50;N65 Z -55;N70 X 17;N75 S 1500 M03 F 0.1;N80 G72 P40 Q70;N85 G00 X 30 Z30;N90 M30;% (END OF PROGRAM)

Introduction to

UNIVERSAL TESTING MACHINE

Introduction A universal testing machine, also known as

a universal tester, materials testing machine or materials test frame, is used to test the tensile stress and compressive strength of materials. It is named after the fact that it can perform many standard tensile and compression tests on materials, components, and structures.

ComponentsLoad frame - usually consisting of two strong

supports for the machine. Some small machines have a single support.

Cross head - A movable cross head (crosshead) is controlled to move up or down. Usually this is at a constant speed: sometimes called a constant rate of extension (CRE) machine.

Output device - A means of providing the test result is needed. Some older machines have dial or digital displays and chart recorders. Many newer machines have a computer interface for analysis and printing.

Test function

Tensile test. Compression test. Bending test.

CalculationPercentage Elongation in length =(Lf-Lo)/(Lo)• Percentage Reduction in Area =(Ao-Af)/(A0)• Engg. Stress=ultimate load/initial area

Rockwell testing

Rockwell testing: In Rockwell testing the minor load is 10 kg

and major load (60, 100, or 150 kg) is used regardless of the type of indenter.

Rockwell superficial testing: In Rockwell superficial testing minor load is 3

kg and major loads (15, 30 or 45 kg) are used.

Parameter

Material Scale Indentor Major Load(Kgf)

Soft HR A Diamond 60

Medium HR B Steel Ball 100

Hard HR C Diamond 150

TEST PROCEDUREApply a minor load of 10 kg. Then the dial is set to zero and then major load

is applied.Then apply major load 60 to 150 kg according

to the scale used for 4 to 5 seconds. Release the major load only. Machine will show the Rockwell Hardness

Number HR on the machine. All these operation will be done by machine

automatically. 100 number means most hard and 0 means

least hard

ConclusionIt help to get familiar with the machine practically.

I got to know lot of technical terms and different machining operations.

Practical knowledge is also important as theoretical.

THANK YOU