HEIDENHAIN TNC 410 - Manual (Page 70)

57 HEIDENHAIN TNC 410
The spindle speed is calculated as follows
n =
MP6570
r • 0.0063
where
n
= spindle speed in rpm
MP6570 = maximum permissible cutting speed in m/min
r = active tool radius in mm
The feed rate for probing is calculated from:
v = meas. tolerance • n
where
v = feed rate for probing in mm/min
meas. tolerance = meas. tolerance in mm, depending on MP6507
n
= speed in rpm
MP6507 determines the calculation of the probing feed rate:
MP6507=0:
The measuring tolerance remains constant — regardless of the tool
radius. With very large tools, however, the feed rate for probing is
reduced to zero. The smaller you set the maximum permissible
rotational speed (MP6570) and the permissible tolerance (MP6510),
the sooner you will encounter this effect.
MP6507=1:
The measuring tolerance is adjusted relative to the size of the tool
radius. This ensures a sufficient feed rate for probing even with
large tool radii. The TNC adjusts the measuring tolerance according
to the following table:
Tool radius Meas. tolerance
up to 30 mm MP6510
30 to 60 mm 2 • MP6510
60 to 90 mm 3 • MP6510
90 to 120 mm 4 • MP6510
MP6507=2:
The feed rate for probing remains constant, the error of
measurement, however, rises linearly with the increase in tool
radius:
Measuring tolerance = r • MP6510
5 mm
where
r = tool radius in mm
MP6510= maximum permissible error of measurement
5.4 T
o
o
l
Measur
ement with the
T
T
1
2
0
T
ouc
h
Pr
obe