Standard Functions
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Newall Measurement Systems
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STANDARD FUNCTIONS
ref
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Centre Find halves the dimension displayed for any or all axes selected. You can use Centre Find in either
absolute or incremental mode. The keystrokes are the same in either case.
The DP8 comes equipped with Digifind, a feature unique to Newall digital readout products. Digifind elimi-
nates the risk of losing your position and datum Set-Up. With Digifind, precise Set-Up of a workpiece is done
only one time.
When the DP8 is powered on, it displays the position at power off, compensated for any movement of a
Spherosyn transducer up to 0.2500" (6mm) and a Microsyn transducer up to 0.1000" (2.5mm) in either direc-
tion since the unit was last used. This applies whether the DP8 was switched off intentionally or accidentally,
i.e., a power failure. If the machine has moved beyond 0.2500" (6mm) - Spherosyn [0.1000" (2.5mm) -
Microsyn], Digifind allows a quick means to find the datum if lost. The DP8 will maintain the position for at
least 30 days, the life of the battery back-up.
There are two ways to use Digifind:
1. In conjunction with a machine or workpiece marker;
2. To find the last datum (absolute zero).
5.3.1 Using a Machine or Workpiece Marker
A mark must be made on both a stationary part and moving part of the machine. The marks must be aligned
and will serve as the machine "home" position. For example, the mark could be on the reader head and mill
table, or a scribed line on the lathe way and a corresponding line on the carriage. The mark must be indeli-
ble, and it must allow the operator to move the machine to within a 0.2500" (6 mm) -Spherosyn [0.1000"
(2.5mm) - Microsyn ] band around the mark at any time.
Alternatively, you can use a convenient reference point on the workpiece. This could be the datum position
itself or any other convenient point. The point can be highlighted with a marker for ease. The reference point
must allow the operator to position the machine to within a 0.2500" (6 mm) -Spherosyn [0.1000" (2.5mm) -
Microsyn] band around the mark.
In the following example, Centre Find is being used on the
X axis to find the centre point of a workpiece that is
100mm wide.
In either absolute mode or incremental mode, once you
have used Centre Find you can locate to the centre point
by moving until the display is at 0.000.
NOTE: If you are in absolute mode, remember that
using centre find will set the datum to the
centre point.
0.000
1/2 A X ?
100.000
Locate to your first position (one edge of
your workpiece) and zero the axis.
XO
X
1
2
or
X
1
2
Use Centre Find to locate the centre point.
Locate/move to the second position (the
other edge of the workpiece)
50.000
5.3 Digifind
5.2 Centre Find
Move until display reads 0.000. At that point
you will locate the center of the port
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