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HA0278T Rev H Dec 2016
Chapter 5
Stage and Axis Type
- For Thorlabs stages, the stage type is displayed automatically
once the axis has been associated using the APTConfig utility. For third party stages,
the display shows ‘
Unknown
’.
Min Pos
- the stage/actuator minimum position (typically zero).
Max Pos
- the stage/actuator maximum position.
Pitch
- the pitch of the motor lead screw (i.e. the distance (in millimetres or degrees)
travelled per revolution of the leadscrew).
Units
- the ‘real world’ positioning units (mm or degrees).
Homing
When homing, a stage typically moves in the reverse direction, (i.e. towards the
reverse limit switch). The following settings allow support for stages with both Forward
and Reverse limits.
Direction
- the direction sense to move when homing, either
Forward
or
Reverse
.
Limit Switch
- The hardware limit switch associated with the home position, either
Forward HW or Reverse HW
.
Zero Offset
- the distance offset (in mm or degrees) from the limit switch to the Home
position.
Velocity
- the maximum velocity at which the motors move when Homing.
For further information on the home position, see Section F.2.2.
Hardware Limit Switches
The operation of the limit switches is inherent in the design of the associated stage or
actuator. The following parameters notify the system to the action of the switches
Caution
Extreme care must be taken when modifying the stage related settings
that follow. Some settings are self consistent with respect to each other,
and illegal combinations of settings can result in incorrect operation of
the physical motor/stage combination being driven. Consult Thorlabs for
advice on settings for stage/actuator types that are not selectable via the
APTConfig utility.
Note
Typically, the following two parameters are set the same, i.e. both
Forward or both Reverse.
Note
The minimum velocity and acceleration/deceleration parameters for a
home move are taken from the existing move velocity profile parameters.
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