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7 tool-tip / milling-cutter radius compensation, Fundamentals – HEIDENHAIN MANUALplus 4110 User Manual

Page 300

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300

6 DIN Programming

6.7 T

ool-Tip / Milling-Cut

ter Radius Compensation

6.7

Tool-Tip / Milling-Cutter Radius
Compensation

Fundamentals

Tool-tip radius compensation (TRC)
If TRC is not used, the theoretical tool tip is the reference point for the
paths of traverse. This might lead to inaccuracies when the tool moves
along non-paraxial paths of traverse. The TRC function corrects
programmed paths of traverse (see “Tool-tip radius compensation
(TRC)” on page 28).

With Q=0, the TRC reduces the feed rate at arcs (G2, G3, G12, G13)
and rounding arcs if the "shifted radius < original radius." The "special
feed rate" is corrected when a rounding as transition to the next
contour element is machined.

Reduced feed rate = feed rate * (offset radius / original radius)

Milling cutter radius compensation (MCRC)
When the MCRC function is not active, the system defines the center
of the cutter as the zero point for the paths of traverse. With the
MCRC function, MANUALplus accounts for the outside cutting radius
when moving along the programmed paths of traverse (see “Milling
cutter radius compensation (MCRC)” on page 29).

Recessing, roughing and milling cycles already include TRC/MCRC
calls. You must therefore ensure that TRC/MCRC is disabled before
you call these cycles. There are a few exceptions to this rule that will
be described where concerned.

Function of the TRC/MCRC

„

If "tool radii > contour radii," the TRC/MCRC might cause
abrasive cuts. Recommendation: Use the finishing
cycle G89 / milling cycles G793/G794.

„

Never select MCRC during a perpendicular approach to
the machining plane.

„

Note on calling subroutines: Switch the TRC/MCRC off

„

in the subprogram in which it was switched on.

„

in the main program if it was switched on there.

N.. . . .

N.. G0 X10 Z10

N.. G41 G0 Z20 [Path of traverse: from X10/Z10 to X10+TRC/
X20+TRC]

N.. G1 X20 [The path of traverse is "shifted" by the TRC]

N.. G40 G0 X30 Z30 [Path of traverse: from X20+TRC/
Z20+TRC to X30/X30]

N.. . . .