Default is 0.000
Setting Up The Unit
Zero Approach Setup
13
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This setting provides a visual indication that one or more axes are approaching zero. This is done by
using the far left LED segment on each axis, as the axis approaches zero, each segment of the '0'
lights up in quick succession. Once zero has been reached, the '0' to the far left will be constantly on.
Enter any value using the numeric keys to provide zero approach
limits. This can be entered in inches or millimeters by toggling the
t
key.
Note:
To disable the zero approach function, enter a value of 0.000.
Error Compensation
A digital readout (DRO) system helps to improve productivity. It decreases the number of scrapped
parts, as the operator no longer has to be concerned about making mistakes related to counting the
revolutions on the dials. The DRO system also helps to eliminate some errors related to ballscrew
backlash.
The DRO system will operate to its published accuracy, provided all components are in working order
and properly installed. Field calibration is not necessary.
Accuracy problems with machined parts may be caused by machine error, DRO system error, or a
combination of both. The first step in determining the source of error is to check the DRO system. This
is completed by comparing the movement of the Newall reader head to the position reading shown on
the display. A high accuracy standard, such as a laser interferometer is required. A dial indicator can
be used to check short distances, but a laser provides the best results. if a dial indicator must be used,
be sure it is the highest available accuracy.
Instructions
Check the accuracy of the DRO system
1. Place the target of the laser or the needle of the dial indicator directly on the Newall reader head. It
is absolutely critical to take the readings directly from the Newall reader head. If a dial indicator
t
must be used, be sure that the needle of the indicator is perpendicular to the reader head and not
t
angled. If readings are taken anywhere else on the machine, machine errors may distort the results.
2. When the reader head moves, the movement registers on the laser / indicator and the DRO display.
3. Set the laser / dial indicator and DRO position displays to 0.
4. Make a series of movements and compare the position readings between the laser / dial indicator
t
and the DRO display. If the readings match within the accuracy specified, then the DRO system is
t
operating properly. If this is the case, proceed to the next step, “Evaluate machine errors”. If the
t
readings do not match, contact your local Newall Service Representative before proceeding with
t
error compensation.
Evaluate machine errors
1. Put the laser target / dial indicator on the part of the machine where the machining is performed.
2. Make a series of movements and compare the position readings between the laser / dial indicator
t
t
and the DRO display. The difference between the laser / dial indicator reading and the reading on
t
the DRO display is the machine error.
3. Plot the machine error along the entire axis of travel to determine the nature of the error. If it is a
linear error, you can use linear error compensation. If the error is not linear, you should use
segmented error compensation.
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