6 Operation
Achievable set-up tolerances
The tolerances to which tools can be set depend
upon the atness and parallelism of the stylus tip
setting. A value of 5 µm (0.0002 in) front to back
and side to side is easily achievable over the at
portion of the stylus tip, and 5 µm (0.0002 in)
parallelism is easily achievable with the axes of a
square tip stylus. This setting accuracy is sufcient
for the majority of tool setting applications.
Recommended rotating tool feedrates
Cutters should be rotated in reverse to the cutting
direction.
First touch – machine spindle rev/min
Rev/min for the rst move against the probe stylus
is calculated from a surface cutting speed of
60 m/min (197 ft/min).
Spindle speed should be maintained within the
range 150 rev/min to 800 rev/min and relates
to cutters of Ø24 mm to Ø127 mm (Ø0.95 in to
Ø5.0 in).
The surface cutting speed is not maintained if
cutters smaller than Ø24 mm (Ø0.95) or larger
than Ø127 mm (Ø5.0 in) are used.
First touch – machine feedrate
The feedrate (f) is calculated as follows:
f = 0.16 × rev/min f units mm/min (diameter set)
f = 0.12 × rev/min f units mm/min (length set)
Second touch – machine feedrate
800 rev/min, 4 mm/min (0.16 in/min) feedrate.
Software routines
Software routines for tool setting are available
from Renishaw for various machine controllers
and are described in the Probe software for
machine tools – programs and features data sheet
(Renishaw part no. H-2000-2298).
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