A useful starting point for
- Custom robotic axes where transmission packaging is reviewed alongside motor selection.
- Development programs that can define bearing seats, anti-rotation and lubrication access early.
Configuration & OEM engineering
Ultra Micro Planetary Roller Screws
Start miniature roller-screw design with the load path
Ultra micro planetary roller screws are a transmission-development topic before they are a finished actuator selection. Threaded rollers transfer motion between the screw and nut. At a small scale, the nut envelope, bearing arrangement, alignment and assembly access can decide feasibility before a nominal screw diameter does.
Request the applicable drawing / CAD revisionThis is a configuration review, not a stocked SKU listing. Ratings, documentation availability, sample scope and lead time are confirmed for the reviewed design.
The first design decision
Does the complete supported screw assembly fit, including the nut, bearings, guidance and useful travel?
Define these boundaries
- No minimum diameter, load rating or lifetime is implied by the term ultra micro; feasibility is reviewed against the proposed geometry.
- A bare screw assembly is not a guided actuator and should not be treated as a support for unspecified side loads or moments.
Configuration choices and required evidence
Use this matrix to compare candidate configurations. Entries describe decisions to make and evidence to request; they are not unverified product ratings.
| Design input | Options to review | Evidence for the decision |
|---|---|---|
| Geometry | Nominal screw size, lead, nut envelope and end machining | Section drawing, required travel, bearing seats and assembly access. |
| Load spectrum | Push, pull, reversing load and occasional peak events | Force versus time, travel per cycle, speed and required service interval. |
| Support and guidance | Bearing layout, anti-rotation and external guide path | Axial stiffness target, alignment tolerance and moment-load path. |
| Tribology | Lubrication, seals and contamination control | Environment, material compatibility and maintenance access. |
Agree on prototype acceptance before sampling
- 01
Review the section first
Submit an assembly section with the available outer envelope rather than only a target screw diameter. Identify the moving and rotating members.
- 02
Separate ratings from requirements
Record the load spectrum and life objective as buyer inputs. Request the calculation basis and applicable limits for the proposed transmission.
- 03
Release interfaces before sampling
Agree on end machining, nut mounting, lubrication and inspection points. Freeze the drawing revision used for both the sample and its evaluation.
Define the inspection and release package before fixing the sample acceptance criteria.
A practical engineering handoff
Prepare your ultra micro planetary roller screws RFQ
Copy or download this editable text checklist, fill in the operating conditions and send it for review. For confidential drawings, agree on an exchange method and confidentiality terms first. The website form accepts text; it does not upload CAD.
Engineering RFQ — Ultra Micro Planetary Roller Screws Source: https://minilinearactuators.com/products/ultra-micro-planetary-roller-screws To: [email protected] Company / contact: Application and project stage: Available screw / nut / bearing envelope: Lead, stroke and preferred moving member: Axial load spectrum and travel per cycle: Motor speed and target linear speed: Guidance, alignment and lubrication conditions: Life objective, quantities and drawing revision: Required drawings / CAD format and revision: Sample quantity / estimated production quantity: Target milestone: Requirements checklist only. Configuration, documentation availability, acceptance criteria and commercial terms require review.
Email the checklist →
Engineering FAQ
Do you publish a smallest roller-screw diameter?
A minimum size is not published here because manufacturing feasibility depends on lead, nut geometry, end machining and the required load path. Send the envelope and operating conditions for a configuration review.
Should I choose a roller screw or a ball screw?
Compare candidate assemblies using the same load spectrum, travel, envelope, stiffness and maintenance constraints. Architecture names alone do not establish which assembly meets your application or total cost target.
Can I request a bare transmission rather than a complete actuator?
Yes, describe the supply boundary in the RFQ. Identify which party supplies the bearings, motor, coupling, guides and lubrication system, and include the interface drawings needed to assess compatibility.
Compare related architectures
- Inverted Roller Screw Actuators →
Evaluate internal roller travel, smooth output and bearing integration.
- Brushless Roller Screw Servo Actuators →
Review the motor, transmission and thermal envelope as one axis.
- Miniature Servo Electric Cylinders →
Specify a complete electromechanical axis with defined interfaces.
- Miniature Screw-driven Actuators family →
Review your operating point and interfaces
Published and reviewed · Mini Linear Actuators engineering content