HEIDENHAIN TNC 370 User Manual page 292

9 3D Touch Probes
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9.6
Measuring Tools with the ll' 120 Touch Probe
Measuring the tool length
Before me~stsuring a tool fbr the fir&t time, yaw must enter the fatlowing
data
m the tool into toot table T0QL.T {see
page
44 1 f: the appraximm radius, the approximate fangth, the number al cutting edges, and the cutting direc&m.
The tool length is measured with the cycle TCH PROBE 31 TOOL
LENGTH. Depending on the selected input parameters you can deter-
mine the length of a tool by one of the following methods:
l
Measurement while the tool is rotating:
This method can be used if the tool diameter is larger than the
diameter of the measuring surface of the ll 120.
l
Measurement while the tool is at standstill:
This method can be used if the tool diameter is smaller than the
diameter of the measuring surface of the TT 120. Used for drills or
spherical cutters.
l
Measurement of the individual cutting edges of the tool while it is at
standstill:
This method can be used if the tool diameter is larger than the
diameter of the measuring surface of the TT 120.
Measuring cycle for measuring a tool during rotation
The TNC determines the longest cutting edge of a rotating tool by
positioning the tool to be measured at an offset to the center of the touch
probe system and then moving it towards the measuring surface until it
contacts the surface. The offset is programmed separately for each tool
in the tool table (1T:R-OFFS).
Measuring cycle for measuring a tool during standstill (e.g. for drills)
The TNC positions the tool to be measured over the center of the meas-
uring surface. It then moves the tool towards the measuring surface of
the lT 120 (without rotation of the spindle) until the tool contacts the
surface. To activate this function enter 0 for TOOL OFFSET: RADIUS
(TTz R-OFFS) in the tool table.
Measuring cycle for measuring single cutting edges
The TNC pre-positions the tool to be measured to a position at the side of
the touch probe head. The distance from the tool tip to the upper edge of
the touch probe head is defined in MP 6530. You can enter an additional
offset under TOOL OFFSET: LENGTH (TT: L-OFFS) in the tool table.
The tool is then probed radially during rotation to determine the starting
angle for measuring the single cutting edges.
With the aid of oriented spindle stops, the TNC then measures the length
of each cutting edge. To activate this function program TCH PROBE 31 =
1 for CUTTER MEASUREMENT.
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9-34
TNC 370