Mid (Infeed Depth) - Siemens SINUMERIK 840D Programming Manual

Turning Cycles 03.96
4 4
08.97
4.5 Stock removal cycle – CYCLE95

MID (infeed depth)

Under parameter MID you define the maximum possible
X
infeed depth for the roughing operation.
The interpretation of this parameter depends on the
cycle setting data for software release 4 and higher
_ZSD[0] (see Section 4.2).
The cycle automatically calculates the actual infeed
depth for roughing.
Where contours with relief cut elements are to be
machined, the cycle divides up the roughing
operation into single roughing steps. The cycle
recalculates the actual infeed depth for every
Z
roughing step. This actual infeed depth always lies
between the programmed infeed depth and half its
value. The number of required roughing cuts is
derived from the total depth of a roughing section
and the programmed maximum infeed depth. The
total depth to be machined is then divided equally
amongst these roughing cuts. This method ensures
optimum cutting conditions. The machining steps
shown in the figure above are used for roughing this
contour.
Example for the calculation of the actual infeed
depths:
Machining section 1 has a total depth of 39 mm. If
the maximum infeed depth is 5 mm, 8 roughing cuts
are required. These are performed with an infeed of
4.875 mm.
In machining section 2, 8 roughing cuts, each with
an infeed of
4.5 mm are also executed (total difference 36 mm).
Machining section 3 is roughed twice with an actual
infeed of 3.5 (total difference 7 mm).
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SINUMERIK 840D/840Di/810D/FM-NC Programming Guide, Cycles (PGZ) - 04.00 Edition