Hybrid calculator + report
Run the load-life screen first, then use the report to judge package fit, evidence, and limits for 10 mm inverted micro-actuators.
Decision summary
These conclusions keep the tool and report aligned: the calculator is a triage screen, while the report explains why a warning or resize result should not be overridden without engineering data.
The 10 mm inverted format is strongest when the nut must become part of the actuator package. If length is not the limiting factor, a standard planetary roller screw is usually lower risk.
Evidence: Rollvis RVi product guidance describes the compact inverted architecture; package fit remains drawing-specific.
Treat 5 kN as the conservative continuous-duty screen. Loads above 5 kN can be investigated, but need duty-cycle, lubrication, preload, and thermal review before quoting.
Evidence: Internal preliminary screening assumption; public RVi catalog values are shown separately as context, not as a rating for this design.
Peak or theoretical capacity is not a published continuous catalog limit for this package. The calculator now blocks combinations above the conservative 10 mm review envelope.
Evidence: Public size-specific empirical data remains limited; use project validation.
A 10 mm screw cannot be responsible for side load, moment load, or actuator alignment. The application must include rails, bushings, or a guided carriage.
Evidence: Roller screw selection practice and micro-scale package constraints.
Fig 1. Conceptual inverted roller screw cross-section, not a manufacturing drawing. Actual roller count, thread form, preload, and housing interface are project-specific.
Specifications
Values below are screening inputs for this page. Final use requires project drawings, inspection plans, lubricant selection, and life-test criteria.
| Parameter | Screening Value | Boundary / Limitation | Source |
|---|---|---|---|
| Nominal screw diameter | 10 mm | Treat 10 mm as the nominal screw diameter. The screw is screened for axial load only; external guides must carry radial and moment loads. | Page scope and standard axial-load screening practice. |
| Nut outer diameter | From 22 mm | Quote-specific wall thickness, preload, recirculation clearance, and housing interface must be confirmed from drawings. | Internal package concept, not a public guaranteed catalog value. |
| Lead used by calculator | 2.0 mm | The calculator assumes a 2.0 mm lead. Confirm the actual lead from the project drawing; changing it changes speed and life estimates. | Calculator screening assumption; confirm against the project drawing. |
| Preliminary dynamic capacity | C_a 35 kN | Internal preliminary value used only for RFQ triage; it is not a published or independently verified rating. Rollvis lists 13.4 kN for its RVI 10.5 × 2.0 mm example; that different geometry is context only, not a rating comparison. | Internal Micro-RV preliminary specification. |
| Continuous axial load screen | <=5 kN | 5-12 kN requires load-spectrum review. Above 12 kN should resize or move to a larger RVi package. | Conservative engineering screen from internal data. |
| Stroke screen | <=200 mm | Longer travel increases nut length, buckling sensitivity, critical-speed risk, and alignment sensitivity. | Micro package design rule; verify by application geometry. |
| Speed screen | <=2,000 RPM | The 2,000 RPM limit is a conservative page screen, not a universal maximum. Higher speed needs thermal, lubrication, preload-torque, and motor-integration review. | Internal screening assumption; verify for the selected geometry. |
| Positioning target | Drawing-specific, often <5 um backlash target | Preload improves backlash but increases friction and temperature. Absolute zero backlash should not be specified unless needed. | Application-specific metrology requirement. |
Evidence
Public manufacturer pages support the general roller screw selection logic. Size-specific values for this 10 mm inverted package are internal preliminary data and must be confirmed per project.
| Source | Supports | Confidence |
|---|---|---|
| Tolomatic actuator life guide | The basic L10 relationship for roller-screw life and the need to use application load and motion data. | High for the general life-screen method; it does not validate the internal 35 kN capacity assumption or this custom design. |
| Rollvis RVi inverted screw product page | The inverted architecture, compact packaging rationale, and published shaft-diameter range of 8–100 mm. | High for the manufacturer’s product-family description; it does not validate this page’s custom dimensions or load values. |
| Rollvis RVi technical data tables (2024) | A published RVI 10.5 × 2.0 mm example lists Ca 13.4 kN and C0a 20.8 kN; these are a separate manufacturer design, not ratings for this custom page. | High for the cited catalog example; it is included only as a public reference point and is not directly comparable to the internal concept. |
| Internal Micro-RV preliminary specification | 10 mm nominal diameter, 2.0 mm lead, preliminary C_a 35 kN, C_0a 52 kN, and G3/G5 accuracy options. | Medium until confirmed against project drawings, heat treatment, lubrication, and inspection records. |
| Manufacturing constraints (DFM) | Internal thread grinding and case-depth are identified as project-specific manufacturing risks for this concept; they require process evidence and prototype validation. | Preliminary internal DFM concern, not a universal limitation or an externally verified service-life comparison. |
| Option | Best For | Tradeoff |
|---|---|---|
| 10 mm inverted roller screw | Shortest actuator stack, hollow-shaft motor integration, medical or optical micro-actuation. | Highest manufacturing risk and narrowest validation window. Use only when the short package pays for the complexity. |
| 10 mm standard planetary roller screw | Small diameter with less packaging pressure and easier inspection access. | Longer actuator body than inverted architecture, but usually simpler and less costly. |
| Larger-diameter inverted RVi package | A project that exceeds the 10 mm screening envelope and can accept a larger radial package. | Uses more radial space; achievable load, thermal, buckling, and manufacturing margins depend on the selected geometry and require a drawing review. |
| Micro ball screw | Lower load, lower cost, and smoother sourcing when life margin is modest. | Lower load density than a roller screw and may need a longer nut for the same force margin. |
Assumptions: High power density needed, shock loads, compact joint integration.
Screen: Excellent fit for hollow-shaft EMAs if continuous thermal duty is managed and external guidance handles moments.
Next action: Provide peak torque, pinch force, and duty cycle for life calculation.
Assumptions: Extreme reliability, high shock-load margin, strict envelope.
Screen: Evaluate the inverted architecture for its packaging fit; shock performance must be established for the selected geometry and validated with lubricant and temperature extremes.
Next action: Start with prototype risk review before locking material and case hardening specifications.
Assumptions: Low force, fine motion, high repeatability, and compact motor integration.
Screen: Strong fit when the inverted nut shortens the mechanism and load stays well below 5 kN.
Next action: Request lead accuracy, backlash, and cleanliness requirements.
Assumptions: >200 mm stroke or sustained load above 5 kN.
Screen: Not the default 10 mm use case; buckling, critical speed, and heat margin dominate.
Next action: Compare against a larger-diameter inverted RVi configuration if the actuator can accept the added radial package.
Related paths
Use these pages to compare the 10 mm inverted roller screw against larger RVi packages, product families, engineering review, and manufacturing constraints.
| Risk | Impact | Control |
|---|---|---|
| Internal thread grinding limitations (DFM) | If the selected process cannot meet the required case depth or thread finish, service life may fall below the preliminary estimate. | Ask the supplier to document achievable case depth and validate it on the prototype before estimating service life. |
| Side load or misalignment carried by the screw | Uneven roller contact, backlash drift, and early surface fatigue. | Use external guides and specify allowable radial/moment load separately from axial force. |
| Over-specified zero backlash | Unnecessary preload raises torque and heat in a package with little thermal mass. | Specify the real repeatability target first, then choose preload and inspection method. |
| Cleanroom or medical lubricant mismatch | Viscous drag, particle risk, or failed sterilization validation. | Qualify lubricant and material stack before final life testing. |
| Long stroke at 10 mm diameter | Lower critical-speed margin and a longer nut that defeats the package advantage. | Resize to a larger inverted RVi package when stroke exceeds 200 mm. |
No. Treat this page as a technical screening page for a custom 10 mm inverted roller screw. Final dimensions and ratings require drawings and inspection records.
The package is extremely small, so preload heat, lubrication, and alignment can dominate the theoretical load rating. The calculator is built for RFQ triage, not final design release.
Possibly, but not as a self-serve continuous-duty assumption. Above 5 kN needs duty-cycle and thermal review; above 12 kN should usually resize or move to a larger package.
The page uses a simplified L10-style life screen from preliminary dynamic capacity, axial load, speed, lead, and stroke. It excludes shock, contamination, side load, and preload heat.
No. The screw should be treated as an axial transmission element. Rails, bushings, or a guided carriage must carry radial and moment loads.
Consider a larger diameter when load exceeds the conservative 10 mm screen, stroke is longer than 200 mm, or the actuator needs more thermal and preload margin. Confirm a suitable size and its ratings with the supplier; diameter labels are not interchangeable with this custom 10 mm concept.
It can be investigated with preload and precision grinding, but the right target depends on repeatability, torque budget, lubricant, and inspection method.
Send axial load, stroke, speed, duty cycle, life target, packaging envelope, backlash or repeatability target, lubricant constraints, and any sterilization or cleanliness requirements.
No. It is a preliminary package target. Final outer diameter depends on thread form, roller count, preload, material, heat treatment, and how the nut interfaces with the actuator.
Only after project-specific material, cleanliness, sterilization, biocompatibility, and regulatory validation. This page does not claim medical approval.
A custom micro inverted roller screw commonly needs a drawing review, process setup, grinding, inspection, and life test planning. Exact timing should be quoted after specs are confirmed.
Keep the result as a prototype-review signal. Send the load spectrum and CAD package so the design can be checked for heat, preload, stroke, and alignment risks.
Include axial load, stroke, speed, duty cycle, life target, packaging envelope, backlash or repeatability target, guide structure, lubricant restrictions, and any cleanroom, sterilization, or material constraints.
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