CNC Programming Circular Interpolation

Definisi G02, G03, I, J & K

• G02: Circular interpolation (CW)

• G03: Circular interpolation (CCW)

• I, J & K (Use when <=360 degree) " Incremental distance from SP to CP of arc "

• I: Specifies the incremental ±X distance from the center of the tool at the start of the arc to the center of the arc.

• J: Specifies the incremental ±Y distance from the center of tool at the start of the arc to the center of the arc

Circular interpolation
why R?

•R is easier to define, easier to make a mistake and get an incorrect radius.
•With R, the machine still do the work whether the R is correct or incorrect.
•With incorrect I, J & K, the machine will stop and gives an error message before executing.
•With R, to generate a circle path of over 180 degrees, then specify a negative R.

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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.
                                                                                      

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