Manual BiSlide® Left-Right Screw Motion
When the knob is turned, two objects sharing a common axis of movement move toward or away from each other.
This configuration is very useful for applications where two objects must share a common axis of movement. This assembly incorporates two carriages driven by a single right- and left-hand threaded lead screw. When the knob is turned, the carriages simultaneously move toward or away from each other.
Note: Maximum carriage separation = distance of travel – (4.6″ x 2).
Travel of each carriage = separation / 2
| Coefficient of friction | .09 typical |
| Coefficient range | 0.04 (Heavy Load Dynamic) to 0.15-0.3 (Lubricated heavy Load Static>1 hour) |
| Operating temperature | 0 to 180° F (-18 to 82° C) |
Properties of Velmex Stages - Information on stage composition, tolerances, wear and design for specialty applications.
Load Parameters - Definitions and parameters that effect the various load ratings.
Here is an example of a left-right screw motion motorized linear translation stage using BiSlide®. In this configuration, both carriages move along a shared axis. When the motor is activated, the two payloads either move toward each other or away from each other, depending on the screw rotation direction.
Lead Screw Specifications
English Thread Lead Screws
| Pitch | Backlash Typical | Resolution | BiSlide® Code | |||
| Turns per inch | Advance per revolution | English | Metric | Degrees | English | |
| 2.5* | 0.400" | 0.002" | 0.051 mm | 1/200 rev or 1.8° | 0.001" | E04 |
| 5* | 0.200" | 0.001" | 0.025 mm | 1/200 rev or 1.8° | 0.0005" | E02 |
| 10 | 0.100" | 0.0005" | 0.013 mm | 1/200 rev or 1.8° | 0.00025 | E01 |
Metric Thread Lead Screws
| Pitch | Backlash Typical | Resolution | BiSlide® Code | |||
| Turns per cm | Advance per revolution | English | Metric | Degrees | Metric | |
| 5 | 2 mm | 0.00039" | 0.01 mm | 1/200 rev or 1.8° | 0.005 mm | M02 |
| 10 | 1 mm | 0.0002" | 0.005 mm | 1/200 rev or 1.8° | 0.0025 mm | M01 |
*Not recommended for vertical assemblies because the lead screw could back drive.
More accurate screws are available. Contact a Velmex Application Engineer for more information.
In manually operated applications backlash can be adjusted to near 0.
Resolution specified with standard Velmex motor configurations with 1.8° step angles using VXC Stepping Motor Controller.
| Repeatability | 0.00015″ (4 microns) typical |
| Straight line accuracy | 0.003″ (0.076 mm) over entire travel distance. Higher accuracy 0.0015″ (0.038mm) available |
| Screw lead accuracy | 0.003″/10″ (0.076 mm/25 cm) 0.0015″/10″ available. Consult factory. |
Downloads
The majority of CAD drawings found in our Technical Library are Step (.stp) files. You will also see .dxf, .dwg, .sat and .pdf files. For .STP files, you may need to right click on the download button and save the “target” or “link”. If you require a different format or cannot located the drawing you require, please contact us.
| Title | Summary | File Type | Link | hf:file_type |
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