Siemens SINUMERIK 840D Programming Manual page 295

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03.96
08.97
MID (infeed depth)
Under parameter MID you define the maximum possible
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 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 39mm. If
the maximum infeed depth is 5mm, eight roughing
cuts are required. These are performed with an
infeed of 4.875mm.
In machining section 2, eight roughing cuts, each
with an infeed of 4.5mm are also executed (total
difference 36mm).
Machining section 3 is roughed twice with an actual
infeed of 3.5 (total difference 7mm).
© Siemens AG, 2002. All rights reserved
SINUMERIK 840D/840Di/810D Programming Guide Cycles (PGZ) – 11.02 Edition
4.5 Stock removal cycle – CYCLE95
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Turning Cycles
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