Other FUNCTION in CNC System

Modern CNC systems have some specially designed functions to simplify the manual programming. However, since most of these functions are system oriented, it is not intended to discuss them here in detail. The following paragraphs give a brief description of commonly used functions in modern CNC system. The user should refer to the programming manuals of the machine for the detail programming and operation.
  • Mirror Image
This is the function that convert the programmed path to its mirror image, which is identical in dimension but geometrical opposite about one or two axes
  • Pocketing Cycle
Pocketing is common process in machining. This is to excavate the material within a boundary normally in zigzag path and layer by layer. in a pocketing cycle, the pattern of cutting is pre-determined. The user is required to input parameter including the length, width and depth of the pocket , tool path spacing, and layer depth. The CNC system will then automatically work out the tool path.
  • Drilling, Borring, Reaming and Tapping cycle
This is similar to pocketing cycle. In this function, the drilling pattern is pre- determine by the CNC system. What the user has to do is to input the required parameter such as the total depth of the hole, the down feed depth, the relief heigth and the dwell time at the bottom of the hole.
  • Programme repetition and Looping
in actual machining, it is not always possible to machine to the final dimension in one go. This function enables the looping of a portion of the programme so that the portion can be executed repeatedly.

Step for CNC Programming ang Machining

The following is the procedures to be followed in cnc programming and machining. the most important poin is to verify the programme by test run it on the machine before the actual machining in order to ensure that the programme is free of mistake.
  1. Study the part drawing carefully.
  2. Unless the drawing dimension are cnc adapted,select a suitable programme zero point on the work piece. The tool will be adjusted to this zero point during the machine set up.
  3. Determine the machining operetions and their sequence.
  4. Determine the methode af work clamping ( jig and fixtures ).
  5. Select cutting tools and determine spindle speed and feeds.
  6. Write programme ( translate machining step into programme blocks ).If many solutions are possible, try the simplest solution first. It usually longer, but better to procced in this way.
  7. Prepare tool chart or diagram, measure tool geometry (lengths,diameter) and note.
  8. Clamp work piece and set up machine.
  9. Enter compensation value if necessary.
  10. Check and test programme. It is good practice to dry run programme.                                               
  • without the workpiece 
  • without the cutting tool 
  • by raising the tool to safe heigth, If necessary, correct and edit programme and check again.
And than  Start machining.
»»  CNC PROGRAMMING...“Step for CNC Programming ang Machining”

Application systems of CNC machines

Some common types of CNC Machine and instrument used in the industry, such as the following:
  • Dilling Machine
  • Industrial Robots
  • Grinding machine
  • Lathe / Lathe
  • Milling / Machining Center
  • Laser Cutting Machine
  • Turret Press and Punching Machine
  • Electro Discharge Machine
  • WireCut Electro Discharge Machine
  • Coordinate Measurring Machine
  • Water jet cutting system
Application systems of CNC machinesCNC machines are widely used in the machining industry, and are best used to generate the following types of product:
  1. Part with complex contours
  2. Small series and short production times
  3. in cases where there would be human error extremelycostly
  4. Parts, which may have several technical changes, such as during the development of a prototype
  5. Parts that are needed in a hurry
  6. Parts, close tolerance and / or good reproducibility
  7. Reqiuring expensive parts and fixtures, when produced on conventional machines
»»  CNC PROGRAMMING...“Application systems of CNC machines”