Heidenhain TNC 410 User Manual download pdf (Page 47)

4 Programming: Fundamentals of NC, File Management, Programming Aids

4.3 Creating and Writing Programs

Organization of an NC program in HEIDENHAIN

conversational format

A part program consist of a series of program blocks. The figure at

right illustrates the elements of a block.

The TNC numbers the blocks in ascending sequence.

The first block of a program is identified by “BEGIN PGM,” the

program name and the active unit of measure.

The subsequent blocks contain information on:

■ The blank form

■ Tool definitions and tool calls,

■ Feed rates and spindle speeds as well as

■ Path contours, cycles and other functions.

The last block of a program is identified by “END PGM,” the pro-

gram name and the active unit of measure.

Defining the blank form — BLK FORM

Immediately after initiating a new program, you define a cuboid

workpiece blank. This definition is needed for the TNC’s graphic

simulation feature. The sides of the workpiece blank lie parallel to

the X, Y and Z axes and can be up to 30 000 mm long. The blank

form is defined by two of its corner points:

■ MIN point: the smallest X, Y and Z coordinates of the blank form,

entered as absolute values.

■ MAX point: the largest X, Y and Z coordinates of the blank form,

entered as absolute or incremental values.

The TNC can display the graphic only if the short side of the BLK

FORM is longer than 1/64 of the long side.

4.3 Creating and Writing Programs

MAX

MIN

Block:

Path function Words

Block number

1 2 ... 42 43 44 45 46 47 48 49 50 51 52 ... 318 319

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Heidenhain TNC 410 User Manual Page 47