HEIDENHAIN TNC 426B (280 472) Touch Probe Cycles - Manual (Page 126)

114 4 Touch Probe Cycles for Automatic Tool Measurement
4.2 A
v
ailable Cy
cles
Measuring the tool length
Before measuring a tool for the first time, enter the following data on
the tool into the tool table TOOL.T: the approximate radius, the
approximate length, the number of teeth, and the cutting direction.
The tool length is measured with the cycle TCH PROBE 31 TOOL
LENGTH. Depending on the input parameters you can measure the
length of a tool by one of the following methods:
n
If the tool diameter is larger than the diameter of the measuring
surface of the TT, you can measure the tool while it is rotating.
n If the tool diameter is smaller than the diameter of the measuring
surface of the TT, or if you are measuring the length of a drill or
spherical cutter, you can measure the tool while it is at standstill.
n If the tool diameter is larger than the diameter of the measuring
surface of the TT, you can measure the individual teeth of the tool
while it is at standstill.
Measuring cycle for measuring a tool during rotation
The TNC determines the longest tooth 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 toward the measuring surface until it
contacts the surface. The offset is programmed in the tool table under
Tool offset: Radius (TT: 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
measuring surface. It then moves the tool toward the measuring
surface of the TT (without rotation of the spindle) until the tool
contacts the surface. To activate this function, enter zero for the Tool
offset: Radius (TT: R-OFFS) in the tool table.
Measuring cycle for measuring individual teeth
The TNC pre-positions the tool to be measured to a position at the side
of the touch probe head. The distance from the tip of the tool to the
upper edge of the touch probe head is defined in MP6530. You can
enter an additional offset with Tool offset: Length (TT: L-OFFS) in the
tool table. The TNC probes the tool radially during rotation to
determine the starting angle for measuring the individual teeth. It then
measures the length of each tooth by changing the corresponding
angle of spindle orientation. To activate this function, program TCH
PROBE 31 = 1 for CUTTER MEASUREMENT.