Parameters U511 User’s Manual
4-18 Aerotech, Inc. Version 1.1
In Metric mode, we know that the programming unit is 1 millimeter (1 mm). If 1
revolution of the ball screw motor produces 4,000 machine steps and 4 mm of motion,
then the number of machine steps per programming unit is
Machine Steps = 4,000 Machine Steps
= 1000 Machine Steps / mm.
Prog Unit 4 mm
The number of decimal places is usually selected so that programming steps and machine
steps are of similar size. ndec = 3.
Conversion factor = 1,000 Machine Steps / mm = 1.0
10
3
machine steps/programming unit = 1000
programming steps/programming units = 1000
1 Programming Step = 1 mm.
In English mode, one programming unit = 1 inch. One motor revolution is 1000 * 4 =
4,000 machine steps. Since 1 inch = 25.4 mm and one motor revolution = 4 mm, there
are 6.35 motor revolutions per inch or 6.35 * 4,000 = 25,400 machine steps/programming
unit. Four decimal places should be selected so that the programming resolution is not
sacrificed.
Conversion factor = 25,400 Machine Steps / inch = 2.54
10
4
This conversion factor is entered as 2.54.
Machine Steps / Programming Unit = 25,400
programming steps/programming unit = 1,000
The conversion factor parameters each default to the value 1.0. Set the scale factor to 1.0
and the number of decimal places to 0 if you want to program in machine steps.
Metric Scale Factor
English Scale Factor
Default
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