HEIDENHAIN POSITIP 880 User Manual page 94

Whenever you're calculating the SIN, COS or TAN of an angle, enter
the angle first and then press the appropriate soft key. If you were to
enter a value of 30 into a numeric field, then press the SIN soft key, a
value of 0.5 (the SIN of 30 degrees) would appear.
Continuing, let's assume that we are trying to set up a 10 cm SIN bar
at a 30° angle and need to know how tall the block underneath it
should be. If we multiply 0.5000 by 10, we know that we need to use
a 5 cm block.
Angle values use the current angle format selection of
decimal degrees, DMS, or radians.
RPM calculator
The RPM calculator is used to set the RPM (or surface cutting speed)
based on a specified tool diameter. See Fig. I.71.
Press the RPM soft key to open the RPM CALCULATOR form.
The RPM calculator requires a tool diameter. Use the numeric hard
keys to enter a diameter value. The diameter value will default to the
current tool diameter if no new value is entered. If there is no
current tool, the default value is 0.
If a surface speed value is required, enter the value using the
numeric hard keys. When a surface speed value is entered, the
associated RPM value will be calculated.
Surface speed table
When in the SURFACE SPEED field, a soft key is available for
opening on-line help. The table may be consulted for a
recommended range of surface speeds for the material being
machined.
Press either the FEET/MIN or METERS/MIN soft key depending on the
current units.
The RPM CALCULATOR form is closed by pressing the USE soft key.
There is no return value.
Reference tables
Press the REFERENCE TABLES soft key to open on-line help reference
tables.
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Fig. I.71 RPM CALCULATOR form
I Operating Instructions