Siemens SINUMERIK 840D sl Programming Manual page 350

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Tool offsets

8.5 Activate 3D tool offsets (CUT3DC..., CUT3DF...)

Tool center point path with infeed up to the limitation surface CUT3DCCD

If a tool with a smaller radius than the suitable standard tool is used machining is continued

with a milling cutter that is infed in the longitudinal direction until it reaches the bottom of the

pocket. The tool removes as much material from the corner formed by the surface of

limitation and the machined surface as possible. This a combined method of machining

using circumferential and face milling. By analogy, if the tool has a larger radius it is infed in

the opposite direction.

Unlike all other tool compensations of G code group 22, tool parameter $TC_DP6 specified

for CUT3DCCD does not affect the tool radius and the resulting compensation.

The compensation is the sum of

• the wear value of the tool radius (tool parameter $TC_DP15)

• programmed tool offset OFFN.

The generated program does not specify whether the surface to be machined is right or left

of the path. It is therefore assumed that the radius is a positive value and the wear value of

the original tool a negative value. A negative wear value always describes a tool with a

reduced diameter.

Using cylindrical tools

If cylindrical tools are used, infeed is only necessary if the machining surface and the surface

of limitation form an acute angle (less than 90 degrees). If a toroidal miller is used (cylinder

with rounded corners) tool infeed in the longitudinal direction is required for both acute and

obtuse angles.

Programming Manual, 03/2006 Edition, 6FC5398-2BP10-1BA0

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