The
Computer Motion Control system was custom designed |
| The Computer Motion Control system was custom
designed for use with all of our measurement systems and the ASET software program. It
relies on the large memory and high processing speed of a host computer to generate step
pulses and direction signals that are sent to a driver/interface module through a standard
PC parallel printer (LPT) port. The driver/interface modules translate step pulses and
direction logic into signals that drive the stepper motors on the motorized 3D
micro-positioning stage. It has a fourth axis which can drive the focus of a microscope or
other device the user may have. |
The
motion control system is a micro-stepping, four axis stepper motor driver |
| The motion control system is
controlled by an IBM compatible PC. Three of the axes (X,Y,Z) are used to drive
the 3D Motorized Manipulator. The fourth axis (W) can drive the focusing motor on a Video
Zoom Scope or any other stepper motor driven device. |
The
computer provides step, direction, speed and steps/micron logic. |
| The computer also provides positional
information. Though this system was primarily designed for positioning a microelectrode it
has many other applications as well. The minimum micro-step move is 49
nm. The system has an accuracy and repeatability of approximately 0.5
micrometers. The following specifications are
listed for you: |
 |
Motorized
Drives: |
- Travel: 1.25"/ 2.00" (30 mm / 50 mm)
- Speed: Up to 2 mm/sec no load
- Positioning Accuracy: ~ 0.2% of travel
- Bi-directional Repeatability: ~ 1.0 micron
- Minimum Incremental Motion: 0.003 to 0.8 µm
|
Translator
Stages |
- Angular Deviation: ~ 200 mrad
- Centered Load Capacity: 35 / 47 lb (16 / 19 kg)
- Vertical Load Capacity: 15 lb (6.8 kg)
- Threaded holes: 1/4-20 on 1" centers or
M6x1.0 on 25mm centers
|
| Lead Screw - 80 Threads / inch (80 revolutions / inch)
|
(1 / 80 x 25.4 x 103 = µm / revolution)
317.5 µm / revolution |
| Step Motor - 400 full steps / revolution. |
(317.5 µm / 400 = 0.79375 µm / step)
(400 / 317.5 = 1.2598 full steps / µm) |
| Controller - 16 micro-steps / full step. (See IM 483
manual) |
1.2598 full steps / µm.
(16 x 1.2598 = 20.157 micro-steps / µm.)
(1 µm / 20.157 = .04906 µm / micro-step) |
|
|
|
Three acceleration profiles are supported. They are best
described with the following graphs:
|
Need More Information? Have a question?
If you have any questions about the Computerized Motion Control,
click on the Request Form link or send e-mail to Alan Shipley
|
