Parameters U511 User’s Manual
4-16 Aerotech, Inc. Version 1.1
4.5. Page 5: Axis Configuration
The Axis Configuration page contains miscellaneous parameters used to configure the
UNIDEX 511 system. These parameters are explained in detail in this section. Parameters
with and “x” in front of them actually represent 4 different parameters where x can equal
1, 2, 3, or 4 for axes 1, 2, 3, or 4, respectively.
4.5.1. “Metric (x00) and English (x01) conversion factors”
A conversion factor is a number that determines system scaling (i.e., the number of
machine steps in relation to program steps). These parameters give the operator the
flexibility to define arbitrary program units (inches, tenths of inches, millimeters,
centimeters, etc.) on a per axis basis for either Metric or English measuring systems. The
following terms are used in the explanation of the system conversion (scale) factor:
Program Unit User units such as inches, millimeters, degrees, etc. These are
the units that are used within the application program.
Machine Step Smallest feedback device step. This is the smallest possible
increment of movement as measured by the feedback device.
Machine Steps/Unit The number of machine steps per programming unit.
Program Steps The smallest programmable increment of motion. Program steps
= programming units * 10
ndec
where "ndec" is the number of
decimal digits set by the “Metric digits” and “English digits”
parameters (parameter numbers 29, 47, 65, 83 and 30, 48, 66,
84, respectively).
If the number of decimal digits is specified as 3, then the programming step size is .001
(there are 1000 programming steps per programming unit).
The UNIDEX 511 uses one of two system conversion factors to convert programming
units into machine steps. The default conversion factor used for each axis is specified as
either English or Metric by the Metric system (yes/no) parameter (020, 038, 056, and
074). The scaling mode set by these parameters may be overridden by use of the G70
(English) or G71 (Metric) commands.
The UNIDEX 511 uses an internal formula to derive conversion factors. This formula is
shown below.
ConversionFactor =
MachineSteps
Programming Unit
ProgramSteps
Programming Unit
or
()
Conversion Factor
MachineSteps
ProgrammingUnit
ndec
=
10
x00
x01
Conversion Factor Formula
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