44 HA0338T Rev C July 2022
Chapter 6
Steps Per Rev - The number of full steps per revolution of the stepper motor
(minimum '1', maximum '10000'). The K10CR1 stage has a 200 full step/rev motor.
Gearbox Ratio - The ratio of the gearbox. For example, if the gearbox has a reduction
ratio of X:1 (i.e. every 1 turn at the output of the gearbox requires X turns of the motor
shaft) then the Gearbox Ratio value is set to X. (minimum '1', maximum '1000'). The
K10CR1 stage has a greabox ratio of 120:1.
Persist Settings to Hardware
Many of the parameters that can be set for the K10CR1 stages can be stored
(persisted) within the unit itself, such that when the unit is next powered up these
settings are applied automatically. This is particularly important when the driver is
being used manually in the absence of a PC and USB link. The homing parameters
described above are good examples of settings that can be altered and then persisted
in the driver for use in absence of a PC. To save the settings to hardware, check the
‘Persist Settings to Hardware’ checkbox before clicking the ‘OK button.
Note
The Gearbox Ratio parameter is applicable only to motors fitted with a gearbox.
Notes
The ‘Steps Per Rev’ and ‘Gearbox Ratio’ parameters, together with the
‘Pitch’ and ‘Units’ parameters are used to calculate the calibration factor
for use when converting degrees to microsteps. However, the ‘Steps Per
Rev’ parameter is entered as full steps, not microsteps. The system
automatically applies a factor of 2048 microsteps per full step.
The K10CR1 use a 120:1 reduction gearbox. The equivalent calibration
constant is calculated as:
200 x 2048 x 120 = 49,152,000.0 microsteps per rev of the top platform
49,152,000.0/360 = 136533.33 microsteps per degree movement
200 steps per revolution
2048 microsteps per full step
120:1 reduction gearbox
The correct default values for Steps Per Rev and Gearbox Ratio are
applied automatically when the unit is powered up.
Caution
The ‘Persist Settings’ functionality is provided to simplify use of the unit
in the absence of a PC. When the unit is connected to a PC and is
operated via APTUser, the default APTServer settings will be loaded at
boot up, even if the ‘Persist Settings’ option has been checked.
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