Siemens SINUMERIK 808D User Manual page 164

In terrelation o f the DP (or DPR), FDEP (or FDPR) and DAM parameters
The intermediate drilling depth is calculated in the cycle on the basis of final drilling depth, first drilling depth and amount of
degression as follows:
● In the first step, the depth parameterized with the first drilling depth is traversed as long as it does not exceed the total
drilling depth
● From the second drilling depth on, the drilling stroke is obtained by subtracting the amount of degression from the stroke
of the last drilling depth, provided that the latter is greater than the programmed amount of degression
● The next drilling strokes correspond to the amount of degression, as long as the remaining depth is greater than twice
the amount of degression
● The last two drilling strokes are divided and traversed equally and are therefore always greater than half of the amount of
degression
● If the value for the first drilling depth is incompatible with the total depth, the error message 61107 "First drilling depth
defined incorrectly" is output and the cycle is not executed
The FDPR parameter has the same effect in the cycle as the DPR parameter. If the values for the reference and retraction
planes are identical, the first drilling depth can be defined as a relative value.
If the first drilling depth is programmed larger than the final drilling depth, the final drilling depth is never exceeded. The cycle
will reduce the first drilling depth automatically as far as the final drilling depth is reached when drilling only once, and will
therefore drill only once.
D TB (dwell time)
The dwell time to the final drilling depth (chip breakage) is programmed under DTB in seconds.
D TS (dwell time)
The dwell time at the starting point is only performed if VARI=1 (chip removal).
FR F (feedrate factor)
With this parameter, you can specify a reduction factor for the active feedrate which only applies to the approach to the first
drilling depth in the cycle.
VAR I (machining type)
If parameter VARI=0 is set, the drill retracts 1 mm after reaching each drilling depth for chip breakage. If VARI=1 (for chip
removal), the drill traverses in each case to the reference plane shifted by the amount of the safety clearance.
N o te
The anticipation distance is calculated internally in the cycle as follows:
If the drilling depth is 30 mm, the value of the anticipation distance is always 0.6 mm.
•
For larger drilling depths, the formula drilling depth / 50 is used (maximum value 7 mm).
•
AXN (tool axis)
By programming the drilling axis via AXN, it is possible to omit the switchover from plane G18 to G17 when the deep-hole
drilling cycle is used on turning machines.
The identifiers have the following meanings:
AXN=1
First axis of the current plane
AXN=2
Second axis of the current plane
AXN=3
Third axis of the current plane
For example, to machine a center hole (in Z) in the G18 plane, you program:
G18
AXN=1
MD EP (minimum drilling depth)
You can define a minimum drilling depth for drill stroke calculations based on a degression factor. If the calculated drilling
stroke becomes shorter than the minimum drilling depth, the remaining depth is machined in strokes equaling the length of
the minimum drilling depth.
164
Programming and Operating Manual (Milling)
6FC5398-4DP10-0BA6, 09/2017