Siemens SINUMERIK 840D sl Function Manual page 266

W5: 3D tool radius compensation
3.3 Programming
Example: Toroidal miller with reduced radius compared to the standard tool
Tool type
Standard tool with corner rounding R = $TC_DP6
Real tool with corner rounding
Tool types 121 and 131 toroidal
miller
(end mill with corner rounding)
In this example, both $TC_DP15 + OFFN and $TC_DP16 are negative.
3D TRC with CUT3DCCD: Tool center-point path with infeed up to the limitation surface
If a tool with a smaller radius than the appropriate standard tool is used, machining is continued
using a milling tool, which is fed in in the longitudinal direction until it reaches the bottom (base)
of the pocket. The tool removes as much material from the corner formed by the machining
surface and limitation surface. This involves a machining type combining circumferential and
face milling. Analogous to a tool with reduced radius, for a tool with increased radius, the infeed
is in the opposite direction.
①
②
③
④
Contrary to all other tool offsets of G group 22, tool parameter $TC_DP6 specified for
CUT3DCCD has no relevance for the tool radius and does not influence the resulting
compensation. The compensation offset results from the sum of the wear value of the tool
radius (tool parameter $TC_DP15) and a tool offset OFFN programmed to calculate the
perpendicular offset to the limitation surface.
The generated part program does not specify whether the surface to be machined is to the 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 is a negative value. A negative wear value always describes a tool with a
reduced diameter.
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Standard tool
Tool with smaller radius infeed up to the limitation surface
Limitation surface
Machining surface
Shaft radius (R)
R' = $TC_DP6 + $TC_DP15 +
OFFN
Function Manual, 06/2019, A5E47435126B AA
Corner radius (r)
r = $TC_DP7
r' = $TC_DP7 + $TC_DP16
Tools