Siemens SINUMERIK 828D Programming Manual page 305

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Differences between KONTC and KONTT

The figure below shows the differences in approach/retraction behavior between

a tool with an external radius of 20 mm. The tool center point therefore moves along a

circular path with radius 40 mm. The end point of the approach blocks is at X40 Y30. The

transition between the circular block and the retraction block is at the zero point. Due to the

extended continuity of curvature associated with

movement with a negative Y component. This will often be undesired. This response does

not occur with the

change occurs at the block transition.

is exactly the same, but it is machined in the opposite direction.

Fundamentals

Programming Manual, 07/2010, 6FC5398-1BP40-0BA0

10.2 Contour approach and retraction (NORM, KONT, KONTC, KONTT)

. A circle with a radius of 20 mm about the center point at X0 Y-40 is compensated with

retraction block. However, with this block, an acceleration step

block is the approach block rather than the retraction block, the contour

Tool radius compensation

, the retraction block first executes a

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