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1 CNC Milling Machine Mohd Zaid Bin Akop 25 March 2008.

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1 1 CNC Milling Machine Mohd Zaid Bin Akop 25 March 2008

2 2 CONTENTS 1. Introduction 2. CNC Milling Program CNC Codes Coordinates 3. CAD/CAM software FAKULTI KEJURUTERAAN MEKANIKAL UNIVERSITI TEKNIKAL MALAYSIA MELAKA

3 3 1. INTRODUCTION FAKULTI KEJURUTERAAN MEKANIKAL UNIVERSITI TEKNIKAL MALAYSIA MELAKA CNC Milling Machine  Computer Numerical Control (CNC) Milling is the most common form of CNC.  CNC mills can perform the functions of drilling and often turning.  CNC Mills are classified according to the number of axes that they possess. Axes are labeled as x and y for horizontal movement, and z for vertical movement

4 4 1. INTRODUCTION FAKULTI KEJURUTERAAN MEKANIKAL UNIVERSITI TEKNIKAL MALAYSIA MELAKA Roles in CNC Machine Production  Design Engineer Determines part specifications Designs and makes sketch of part. May work directly with computer aided design and drafting system (CAD) to create sketch. Designs and makes sketch of work-holding fixture if needed.  Drafter Makes engineering drawing of part. May also use CAD system to produce final drawing. Makes engineering drawing of fixture if needed.  N/C Programmer Studies engineering drawing to determine best sequence of machining operations; identifies position points needed for programming. Determines location of part or fixture in relation to zero reference point on machine table.

5 5 1. INTRODUCTION FAKULTI KEJURUTERAAN MEKANIKAL UNIVERSITI TEKNIKAL MALAYSIA MELAKA Determines coordinate dimension for position points. Determines tool selection, cutting speeds and feed rate. Write program manuscript.  Typist Typist program manuscript on computer terminal Stores program on disc or tape Verifies program  N/C Machine Operator Insert N/C tape in MCU(machine control unit) tape reader or enters N/C program into MCU memory. Mounts fixture and workpiece on machine Installs tools in toolchanger or manually changes tools. Adjust feeds, speed, tool-depth stop and coolant on machines where these are not automatically controlled. Removes machined work piece from machine.

6 6 1. INTRODUCTION FAKULTI KEJURUTERAAN MEKANIKAL UNIVERSITI TEKNIKAL MALAYSIA MELAKA The Basic Machining Operations 1.Milling is a process of using a rotating tool to remove material along a contour or line. 2. Milling has traditionally been used to create flat surfaces and straight edges on prismatic work pieces (three dimensional shapes that look more like cubes than cylinders. 3.Creating curved contours on a conventional milling machine is an especially difficult task that requires a great amount of skill and specialized tooling. 4.CNC machine tools have made curved contours much easier to create. 5.The most common milling operation are as following

7 7 1. INTRODUCTION FAKULTI KEJURUTERAAN MEKANIKAL UNIVERSITI TEKNIKAL MALAYSIA MELAKA End milling and face milling are the two basic categories of milling that can be used to create common features such as contours, flat surfaces and pockets. a. pocketing b. contouring c. facing d. side milling

8 8 1. INTRODUCTION FAKULTI KEJURUTERAAN MEKANIKAL UNIVERSITI TEKNIKAL MALAYSIA MELAKA CNC Safety Machining and CNC machining all have inherent dangers with rapidly moving machinery, sharp edges and hot flying chip. However, we can minimize many of these dangers by giving some thought to our actions and following the safety rules. 1. Same precautions as with conventional machine tools, including eye protection and standard setup procedures and operation. 2. Do not let others distract you from your work. Your concentration is critical when setting-up and operating machine tools. 3. CNC machine tools move automatically. They are extremely fast and powerful; therefore, special precautions should be taken when working around CNC machine tools 4. You should never attempt to operate a CNC machine tool that you do not fully understand. Instead, you should ask you instructor whenever you are not sure of any procedure or function.

9 9 1. INTRODUCTION FAKULTI KEJURUTERAAN MEKANIKAL UNIVERSITI TEKNIKAL MALAYSIA MELAKA 5. You should never work inside CNC machine tool when some one else is touching the controls. Might accidentally start the machine & cause serious injury. 6.Special care should be used when using rapid traverse on CNC machine tool, including allowing an adequate distance above the work piece and not using rapid traverse below the surface of the part. 7.Part programs should be tested by first using a computer simulation on PC, simulating on the control and then try running above the w/piece at a reduced rate & in single block mode. 8.Most programming errors can be caught by simply proof reading your code. should print a hard copy of your code and spend a few minutes checking for critical safety issues including proper speeds and feeds, proper tool location when using rapid traverse and the correct tool offsets. 9.You should never leave CNC machine tool unattended. Tools can fail rapidly and cause damage or injury if not stopped immediately 10.CNC machine tools should only be operated with the doors closed while in automatic operation. Do not disable or override any of the safety features that were put there to protect you.

10 10 2. CNC MILLING PROGRAM FAKULTI KEJURUTERAAN MEKANIKAL UNIVERSITI TEKNIKAL MALAYSIA MELAKA Codes for Positioning and Milling Modern CNC machine tools can be programmed to perform machining operations with a language G code & M codes. It simple instructions that the programmer will write to make the machine behave in a certain way. There are dozens of G-codes and M-codes used to perform everything from complex machining operations to common tool changes. However, just a few codes, if learned, will get most of the work done. The others are just enhancements to make programming more powerful and provide advanced machine functions. G00 Rapid Motion Positioning X Optional X-axis motion command Y Optional Y-axis motion command Z Optional Z-axis motion command

11 11 2. CNC MILLING PROGRAM FAKULTI KEJURUTERAAN MEKANIKAL UNIVERSITI TEKNIKAL MALAYSIA MELAKA Rapid traverse is used for quickly positioning the tool in preparation for making a cut/moving the tool to a safe location for tool and part change. G00 can be used any place where the tool is not directly in contact with the w/piece and where you wish to save time. Rapid traverse is never used to perform a cut – the velocity is far too fast and is not constant.

12 12 2. CNC MILLING PROGRAM FAKULTI KEJURUTERAAN MEKANIKAL UNIVERSITI TEKNIKAL MALAYSIA MELAKA G01 Linear Interpolation Motion F Feedrate in inches (mm) per minute X Optional X-axis motion command Y Optional Y-axis motion command Z Optional Z-axis motion command R Radius of the circle C Distance from center of intersection where the chamfer begins This G code moves the axes at a commanded feed rate. It is primarily used to cut the workpiece. A G01 feed can be a single axis move or a combination of the axes. The rate of axes movement is controlled by feed rate (F) value. The feed rate value (F) can be on the current program line, or a previous line (the control will always use to most recent F value until another F value is commanded). G01 is a modal command, which means that it will stay in affect until canceled by a rapid command such as G00 or a circular motion command like G02 or G03

13 13 2. CNC MILLING PROGRAM FAKULTI KEJURUTERAAN MEKANIKAL UNIVERSITI TEKNIKAL MALAYSIA MELAKA Once a G01 is started all programmed axes will move and reach the destination at the same time. If an axis is not capable of the programmed feed rate the control will not proceed with the G01 command and an alarm (max feed rate exceeded) will be generated.

14 14 2. CNC MILLING PROGRAM FAKULTI KEJURUTERAAN MEKANIKAL UNIVERSITI TEKNIKAL MALAYSIA MELAKA M6 – Tool change G90 – Absolute Position Commands G54 – Select work coordinate system M03 – Turn spindle on in the forward direction G43 – Tool length compensation + (Add) M08 – Coolant on M09 – Coolant off G53 – Non-modal machine coordinate selection M30 – Program end H- Tool length offset selection

15 15 2. CNC MILLING PROGRAM FAKULTI KEJURUTERAAN MEKANIKAL UNIVERSITI TEKNIKAL MALAYSIA MELAKA G02 CW / G03 CCW Circular Interpolation Motion F Feedrate in inches (mm) per minute I Optional distance along X axis to center of circle J Optional distance along Y axis to center of circle K Optional distance along Z axis to center of circle R Optional radius of circle X Optional X-axis motion command Y Optional Y-axis motion command Z Optional Z-axis motion command These G codes are used to specify circular motion. Two axes are necessary to complete circular motion and the correct plane, G17-19, must be used. There are two methods of commanding a G02 or G03, the first is using the I, J, K addresses and the second is using the R address.

16 16 2. CNC MILLING PROGRAM FAKULTI KEJURUTERAAN MEKANIKAL UNIVERSITI TEKNIKAL MALAYSIA MELAKA Using I, J, K addresses I, J and K address are used to locate the arc center in relation to the start point. In other words, the I, J, K addresses are the distances from the starting point to the center of the circle. Only the I, J or K specific to the selected plane are allowed (G17 uses IJ, G18 uses IK and G19 uses JK). The X, Y, and Z commands specify the end point of the arc. If the X, Y, or Z location for the selected plane is not specified, the endpoint of the arc is the same as the starting point for that axis. To cut a full circle the I, J, K addresses must be used; using an R address will not work. To cut a full circle, do not specify an ending point (X, Y and Z); program I, J or K to define the center of the circle. For example: G02 I3.0 J4.0 (Assumes G17; XY plane)

17 17 2. CNC MILLING PROGRAM FAKULTI KEJURUTERAAN MEKANIKAL UNIVERSITI TEKNIKAL MALAYSIA MELAKA An arc that does not end at a quadrant may require the precise use of trigonometry. G02 X.7071 Y.7071 I1.0 J0.0

18 18 2. CNC MILLING PROGRAM FAKULTI KEJURUTERAAN MEKANIKAL UNIVERSITI TEKNIKAL MALAYSIA MELAKA An circular arc that does not start or end at a quadrant G02 X.7071 Y.7071 I.7071 J

19 19 2. CNC MILLING PROGRAM FAKULTI KEJURUTERAAN MEKANIKAL UNIVERSITI TEKNIKAL MALAYSIA MELAKA Using the R address The R-value defines the distance from the starting point to the center of the circle. Use a positive R-value for radius of 180° or less, and a negative R- value for radius more than 180°.

20 20 2. CNC MILLING PROGRAM FAKULTI KEJURUTERAAN MEKANIKAL UNIVERSITI TEKNIKAL MALAYSIA MELAKA Example for G02 and G03 using R for normal radius

21 21 2. CNC MILLING PROGRAM FAKULTI KEJURUTERAAN MEKANIKAL UNIVERSITI TEKNIKAL MALAYSIA MELAKA G04 Dwell P The dwell time in seconds or milliseconds G04 is used to cause a delay or dwell in the program. The block containing G04 will delay for the time specified by the P code. For example G04 P10.0. This will delay the program for 10 seconds. Note the use of the decimal point G04 P10. is a dwell of 10 seconds. G09 Exact Stop The G09 code is used to specify a controlled axes stop. It only affects the block in which it is commanded; it is on-modal, it does not affect the following blocks. Machine moves will decelerate to the programmed point before another command is processed.

22 22 2. CNC MILLING PROGRAM FAKULTI KEJURUTERAAN MEKANIKAL UNIVERSITI TEKNIKAL MALAYSIA MELAKA G20 Select Inches / G21 Select Metric The G codes G20 (inch) and G21 (mm) codes are used to ensure that the inch/metric selection is set correctly for the program. G28 Return to Machine Zero Thru Optional G29 Reference Point The G28 code is used to return all axes to machine zero, unless an axis (or axes) is specified, in which case only that axis (or axes) is returned to machine zero. G28 cancels tool length offsets for the following lines of code.

23 23 2. CNC MILLING PROGRAM FAKULTI KEJURUTERAAN MEKANIKAL UNIVERSITI TEKNIKAL MALAYSIA MELAKA G40 Cutter Comp Cancel G40 will cancel G41 or G42 cutter compensation. G41 2D Cutter Compensation Left / G42 2D Cutter Comp. Right G41 will select cutter compensation left; that is, the tool is moved to the left of the programmed path to compensate for the size of the tool. A D address must be programmed to select the correct tool radius or diameter offset. If the value in the selected offset is negative, cutter compensation will operate as though G42 (Cutter Comp Right.) was specified. The right or left side of the programmed path is determined by looking at the tool as it moves away from you. If the tool needs to be on the left of the programmed path as it moves away from you, Use G41. If it needs to be on the right of the programmed path as it moves away from you, use G42.

24 24 2. CNC MILLING PROGRAM FAKULTI KEJURUTERAAN MEKANIKAL UNIVERSITI TEKNIKAL MALAYSIA MELAKA G43 Tool Length Compensation + (Add) / G44 Tool Length Comp - (Subtract) A G43 code selects tool length compensation in the positive direction; the tool length in the offsets page is added to the commanded axis position. A G44 code selects tool length compensation in the negative direction; the tool length in the offsets page is subtracted from the commanded axis position. A non-zero H address must be entered to select the correct entry from the offsets page. G49 - G43/G44/G143 Cancel (Group 08) G49 -This G code cancels tool length compensation.(G43,G44,G143) Programming note: An H0, G28, M30, and Reset will also cancel tool length compensation.(G28-Return to m/c zero, M30 program end)

25 25 2. CNC MILLING PROGRAM FAKULTI KEJURUTERAAN MEKANIKAL UNIVERSITI TEKNIKAL MALAYSIA MELAKA G81 Drill Canned Cycle F Feedrate in inches (or mm) per minute L Number of holes to drill if G91 (Incremental Mode) is used R Position of the R plane (position above the part) X X-axis motion command Y Y-axis motion command Z Position of the Z-axis at the bottom of hole

26 26 2. CNC MILLING PROGRAM FAKULTI KEJURUTERAAN MEKANIKAL UNIVERSITI TEKNIKAL MALAYSIA MELAKA Program Example (G81-Drilled canned cycle) The following is a program to drill through an aluminum plate: T1 M06 G00 G90 G54 X1.125 Y S4500 M03 (G90-absolute position, G54- Select work coordinate system) G43 H01 Z0.1 (G43 tool length compensation) G81 G99 Z-0.35 R0.1 F27. (G99-canned cycle R plane return) X2.0 X3.0 Y-3.0 X4.0 Y X5.250 Y G80 G00 Z1.0 (Canned cycle cancel) G28 (Return to machine zero) M30 (program end)

27 27 2. CNC MILLING PROGRAM FAKULTI KEJURUTERAAN MEKANIKAL UNIVERSITI TEKNIKAL MALAYSIA MELAKA G82 Spot Drill Canned Cycle F Feed rate in inches (or mm) per minute L Number of holes if G91 (Incremental Mode) is used P The dwell time at the bottom of the hole R Position of the R plane (position above the part) X X-axis location of hole Y Y-axis location of hole Z Position of bottom of hole Programming Note: G82 is similar to G81 except that you have the option to program a dwell (P)

28 28 2. CNC MILLING PROGRAM FAKULTI KEJURUTERAAN MEKANIKAL UNIVERSITI TEKNIKAL MALAYSIA MELAKA G83 Normal Peck Drilling Canned Cycle F Feedrate in inches (or mm) per minute I Size of first cutting depth J Amount to reduce cutting depth each pass K Minimum depth of cut L Number of holes if G91 (Incremental Mode) is used P Pause at end of last peck, in seconds (Dwell) Q Cut depth, always incremental R Position of the R plane (position above the part) X X-axis location of hole Y Y-axis location of hole Z Position of the Z-axis at the bottom of hole If I, J, and K are specified, the first pass will cut in by the amount of I, each succeeding cut will be reduced by amount J, and the minimum cutting depth is K.

29 29 2. CNC MILLING PROGRAM FAKULTI KEJURUTERAAN MEKANIKAL UNIVERSITI TEKNIKAL MALAYSIA MELAKA If P is specified, the tool will pause at the bottom of the hole for that amount of time. The following example will peck several times and dwell for 1.5 seconds: G83 Z-0.62 F15. R0.1 Q0.175 P1.5. The same dwell time will apply to all subsequent blocks that do not specify a dwell time. Program Example Description T2 M06 (Tool #2 is a ) G90 G54 G00 X0.565 Y S2500 M03(G90-absolute position, G54- Select work coordinate system) G43 H02 Z0.1 M08 (G43 tool length compensation) G83 Z Q0.175 R0.1 F15. X1.115 Y X3.365 Y X4.188 Y X5.0 Y-4.0 G80 G00 Z1.0 M09 (Canned cycle cancel) G28 (Return to machine zero) M30 (program end)

30 30 2. CNC MILLING PROGRAM FAKULTI KEJURUTERAAN MEKANIKAL UNIVERSITI TEKNIKAL MALAYSIA MELAKA

31 31 2. CNC MILLING PROGRAM FAKULTI KEJURUTERAAN MEKANIKAL UNIVERSITI TEKNIKAL MALAYSIA MELAKA G84 Tapping Canned Cycle F Feedrate in inches (or mm) per minute L Number of holes if G91 (Incremental Mode) is used R Position of the R plane (Position above the part) X X-axis location of hole Y Y-axis location of hole Z Position of the Z-axis at the bottom of hole

32 32 2. CNC MILLING PROGRAM FAKULTI KEJURUTERAAN MEKANIKAL UNIVERSITI TEKNIKAL MALAYSIA MELAKA Program example T3 M06 ( Tool #3 is a 3/8”) G90 G54 G00 X0.565 Y S900 M3 (G90-absolute position, G54- Select work coordinate system) G43 H03 Z0.2 M08 (G43 tool length compensation) G84 Z R0.2 F56.25 (G84 Tapping Canned Cycle ) X1.115 Y X3.365 Y X4.188 Y X5.0 Y-4.0 G80 G00 Z1.0 M09 (Canned cycle cancel) G28 Y0 Z0 (G28-Return to machine zero) M30 (program end)

33 33 2. CNC MILLING PROGRAM FAKULTI KEJURUTERAAN MEKANIKAL UNIVERSITI TEKNIKAL MALAYSIA MELAKA G85 Boring Canned Cycle F Feedrate in inches (or mm) per minute L Number of holes if G91 (Incremental Mode) is used R Position of the R plane (position above the part) X X-axis location of holes Y Y-axis location of holes Z Position of the Z-axis at the bottom of hole.

34 34 2. CNC MILLING PROGRAM FAKULTI KEJURUTERAAN MEKANIKAL UNIVERSITI TEKNIKAL MALAYSIA MELAKA G90 Absolute Position Commands All coordinates were given relative to a fixed point called the origin. G91 Incremental Position Commands These G codes change the way the axis commands are interpreted. Axes commands following a G90 will move the axes to the machine coordinate. Axes commands following a G91 will move the axis that distance from the current point.

35 35 2. CNC MILLING PROGRAM FAKULTI KEJURUTERAAN MEKANIKAL UNIVERSITI TEKNIKAL MALAYSIA MELAKA Absolute VS. Incremental Incremental coordinates are referenced from the previous point as thought the previous point has become a new origin. The reference point is essentially moving with every new coordinate.

36 36 2. CNC MILLING PROGRAM FAKULTI KEJURUTERAAN MEKANIKAL UNIVERSITI TEKNIKAL MALAYSIA MELAKA

37 37 2. CNC MILLING PROGRAM FAKULTI KEJURUTERAAN MEKANIKAL UNIVERSITI TEKNIKAL MALAYSIA MELAKA G150 General Purpose Pocket Milling D Cutter size selection F Feedrate I X-axis cut increment (must be a positive value) J Y-axis cut increment (must be a positive value) K Finishing cut allowance (must be a positive value) L Optional repetition count P Subroutine number defining outside of shape Q Incremental Z-axis cut depth per pass (must be a positive value) R R plane position S Optional spindle speed X X position of starting hole Y Y position of starting hole Z Final depth of the pocket

38 38 2. CNC MILLING PROGRAM FAKULTI KEJURUTERAAN MEKANIKAL UNIVERSITI TEKNIKAL MALAYSIA MELAKA If I is used, the pocket is cut from a series of strokes in the X-axis. If J is used, the pocket is cut from a series of strokes in the Y-axis. The finishing pass is width K. There is no finishing pass in the Z depth. The R value should be specified even if it is zero (R0); or the last value specified for R will be used.

39 39 2. CNC MILLING PROGRAM FAKULTI KEJURUTERAAN MEKANIKAL UNIVERSITI TEKNIKAL MALAYSIA MELAKA Multiple passes over the area can be selected to control the depth of the cut. At least one pass is made over the pocket and multiple passes are made after feeding down by amount Q until the Z depth is reached. If an L count is specified, the entire block is repeated and an incremental X or Y (G91) will reposition the pocket. The subroutine must define a closed area by a series of G01, G02, or G03 motions in X and Y. Example : Square pocket

40 40 2. CNC MILLING PROGRAM FAKULTI KEJURUTERAAN MEKANIKAL UNIVERSITI TEKNIKAL MALAYSIA MELAKA M Code Introduction M-Codes are non axes moving commands for the machine. The format for an M code is the letter “M” followed by two numbers, for example M03. Only one M code may be programmed per line of code. All M codes take effect at the end of the block. M00 Stop Program The M00 code is used to stop a program. It stops the axes, spindle, turns off the coolant (including Through Spindle Coolant). The next block (block after the M00) will be highlighted when viewed in the program editor. Pressing Cycle Start will continue program operation from the highlighted block. M01 Optional Program Stop M01 works the same as M00, except the Optional Stop feature must be on.

41 41 2. CNC MILLING PROGRAM FAKULTI KEJURUTERAAN MEKANIKAL UNIVERSITI TEKNIKAL MALAYSIA MELAKA M02 Program End The M02 code is used to end a program. Note that the most common way of ending a program is with an M30. M03 / M04 / M05 Spindle Commands M03 turns spindle on in the forward direction M04 turns spindle on in the reverse direction M05 Stops the spindle Spindle speed is controlled with an S address code, for example, S5000 will command a spindle speed of 5000RPM. M06 Tool Change The M06 code is used to change tools, for example M06 T12 this will put tool 12 into the spindle. If the spindle is running, the spindle and coolant will be stopped by the M06 command.

42 42 2. CNC MILLING PROGRAM FAKULTI KEJURUTERAAN MEKANIKAL UNIVERSITI TEKNIKAL MALAYSIA MELAKA M08 Coolant On / M09 Coolant Off The M08 code will turn on the optional coolant supply and an M09 code will turn it off. M30 Program End and Rewind The M30 code is used to stop a program. It stops the spindle and turns off the coolant and the program cursor will return to the start of the program. M30 cancels tool length offsets.

43 43 3. CAD/CAM SOFTWARE FAKULTI KEJURUTERAAN MEKANIKAL UNIVERSITI TEKNIKAL MALAYSIA MELAKA What is CAD/CAM software? -Many toolpaths are too difficult and expensive to program manually. For these situations, we need the help of a computer to write an NC part program. -The fundamental concept of CAD/CAM is that we can use a Computer-Aided Drafting (CAD) system to draw the geometry of a workpiece on a computer. -Once the geometry is completed, then we can use a Computer-Aided Manufacturing (CAM) system to generate an NC toolpath based on the CAD geometry. -Some of the CAM software providers are UGS Corp, Dassault Systèmes, PTC, Hitachi Zosen, Delcam, Planit-Edgecam, Tebis, TopSolid, CNC (Mastercam), SolidCAM, DP Technology's ESPRIT, OneCNC, Sescoi, SurfCAM, BobCAD, and GibbsCAM -The progression from a CAD drawing all the way to the working NC code is illustrated as follows:

44 44 3. CAD/CAM SOFTWARE FAKULTI KEJURUTERAAN MEKANIKAL UNIVERSITI TEKNIKAL MALAYSIA MELAKA Step 1 The geometry is defined in a CAD drawing. This workpiece contains a pocket to be machined. It might take several hours to manually write the code for this pocket. However, we can use a CAM program to create the NC code in a matter of minutes.

45 45 3. CAD/CAM SOFTWARE FAKULTI KEJURUTERAAN MEKANIKAL UNIVERSITI TEKNIKAL MALAYSIA MELAKA Step 2 The model is next imported into the CAM module. We can then select the proper geometry and define the style of toolpath to create, which in this case is a pocket. We must also tell the CAM system which tool to use, the type of material, feed and depth of cut information.

46 46 3. CAD/CAM SOFTWARE FAKULTI KEJURUTERAAN MEKANIKAL UNIVERSITI TEKNIKAL MALAYSIA MELAKA Step 3 The CAM model is then verified to ensure that the toolpaths are correct. If any mistake are found, it is simple to make changes at this point. Step 4 The final product of the CAD/CAM process is the NC code. The NC code is produced by post-processing the model to create NC code that is customized to accommodate the particular variety of CNC control.

47 47 FINAL TEST FAKULTI KEJURUTERAAN MEKANIKAL UNIVERSITI TEKNIKAL MALAYSIA MELAKA  Final Test : 20% of final marks  Duration: 1 ½ hours  Date: 3 April 2008  Time: 8.30 – pm  Location: BK5 & BK6 (Bangunan Akademik, Cubic)

48 48 THE END FAKULTI KEJURUTERAAN MEKANIKAL UNIVERSITI TEKNIKAL MALAYSIA MELAKA Good Luck!


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