IrisX Pro • dimension-level revision comparisonPRODUCT VIEW
IrisX Pro • dimension-level revision comparison
IrisX extracts, balloons and compares engineering drawing characteristics. It does not calculate tolerance stacks.
Managed tolerance engineering
Your engineers design.
We handle the stacks.
Hand off your tolerance stack-up workload to Rev4 Engineering. We perform the analysis, manage changes, document the results, and help your team make confident dimensional decisions—without adding headcount or another software rollout.
FREE preliminary review of one tolerance stack
✓ Engineering-led analysis✓ Excel-friendly deliverables✓ Revision-aware workflow
Example project · Assembly A-104● Engineer-reviewed
Start with what you already have.
No forced data migration or new software rollout.
Assembly_stacks_revC.xlsxExisting formulas, stack chains & assumptions
Housing_drawing_revD.pdfScanned drawing, GD&T & handwritten markup
Assembly_A104.step3D geometry reference & assembly interfaces
Parts_BOM_supplier_data.csvPart numbers, revisions & supplier tolerances
Illustrative file set; actual file support assessed during intake.
Go beyond the calculation.
We assess design intent, open questions and risks with your engineers.
1
Trace the functional requirementDefine the critical gap, datum reference, limit and acceptance criteria.
2
Check the existing workbookReview stack direction, units, formulas, assumptions and missing inputs.
3
Evaluate engineering optionsWorst-case / RSS where appropriate; identify sensitive contributors and alternatives.
4
Close the feedback loopAnnotated issues, engineering responses and proposed follow-up actions.
Decisions your team can act on.
Clear outputs, reviewed assumptions and a path for the next revision.
0.35 mmIllustrative nominal gap
±0.12 mmIllustrative WC variation
✓
Analysis workbook + reportTraceable dimensions and methods
✓
Risk & sensitivity summaryCritical contributors and options
✓
Review log + revision baselineAssumptions, responses, status and next actions
Illustrative values only—not a production design or validated study.
Illustrative service scenario, not a live Tolerance360 application. Actual product views appear below.
Start with your existing engineering data
Your files. Your workflows.
Our engineering execution.
Have Excel stacks, legacy drawings, supplier data or CAD models? Send an inventory of what exists. We agree on the input set, the technical checks and the outputs—rather than demanding your team rebuild everything in a new tool.
01 / CUSTOMER INPUTS
▦
Excel stacksXLSX, formulas, existing calculations
▤
2D drawing filesPDF, images, scans, handwritten markup
⬡
CAD geometrySTEP, Parasolid, native CAD per project
☷
Other engineering recordsBOMs, supplier specs, ECOs, inspection data
02 / DRAWING INTELLIGENCE
IrisX ProExtract and balloon dimensions, identify GD&T and compare drawing revisions. An engineer verifies the extracted data.
03 / REV4 ENGINEERING
REV4
Engineering interpretationReview function, datum references, contributors, direction, design intent and missing data. Excel/CAD/BOM inputs can also enter here directly.
04 / STACK & DELIVERY
Tolerance360Excel-based 1D/2D stack analysis, worst-case/RSS/Monte Carlo, revision-aware data and deliverable reports.
Native CAD compatibility is project-specific. Neutral exports or customer-provided views may be needed. Handwriting and scanned geometry receive human verification; full 3D variation simulation is separately scoped when required. Customer approval remains the design authority.
POWERED BY IRISX + TOLERANCE360Discuss my 2D drawing project →
No 3D CAD? We can start with your 2D drawings.
Many teams have released PDFs, scanned prints, marked-up drawings or legacy Excel studies—but no usable 3D assembly model. That should not stop tolerance analysis. Rev4 can use IrisX to help capture drawing dimensions, tolerances, GD&T and revision information, then have engineers verify the information and develop the required stack-up analysis in Tolerance360.
✓Capture dimensional data from PDF drawings, scans and available engineering files
✓Review callouts, functional chains, assumptions, datums and missing information
✓Build or validate 1D/2D stacks and track changes across revisions
✓Deliver reviewed calculation workbooks, annotated findings and recommendations
2D data extraction is not automatic 3D-model reconstruction. Engineering verification and sufficient dimensional information are required; additional measurements or design clarification may be needed.
Independent tolerance engineer or consultant?
Explore the consultant partnership →Partner with Rev4 to offer more projects, software-enabled workflows and delivery support.
Actual product interfaces
Two distinct tools. One engineering service.
IrisX handles drawing data and changes. Tolerance360 handles tolerance stacks, what-if analysis and managed results. Rev4 engineers connect the work—not an automatic black-box pipeline.
IrisX Pro • drawings & revisionsPRODUCT VIEW
IrisX Pro • drawings & revisions
Review ballooned drawing characteristics and changes between revisions.
SwivelCaster • Monte Carlo resultsPRODUCT VIEW
SwivelCaster • Monte Carlo results
Tolerance360 analysis outcomes and distribution view from your SwivelCaster demonstration.
What engineering teams receive
Not just a spreadsheet. A reviewed engineering decision package.
We turn scattered inputs into documented analysis, practical feedback and a reusable baseline for future changes.
COMPLIMENTARY · FIRST STEP
How confident are you in your tolerance stacks?
Get a FREE preliminary review of one existing tolerance stack. A practical first look at your dimension chain, calculations, assumptions and potential gaps—followed by a short findings summary.
- Screen one reasonably scoped, representative stack or redacted example
- Look for formula, direction, units and omitted-contributor issues
- Receive written observations and recommended next steps
- Optional 30-minute discussion of your overall stack workload
Why this model
Collaboration is valuable. Completed engineering work is better.
Your CAD review, PLM and spreadsheet tools can remain in place. Rev4 provides the engineering capacity to close the dimensional issues surfaced by reviews.
Bring existing tools, source documents and workflows. Receive agreed deliverables back in familiar formats.
Not just comments: check the stack, explain functional risk, document findings and support the decision.
Keep a maintained baseline when parts, suppliers and design requirements change under a managed engagement.
The problem
Tolerance analysis is essential.
Finding time to do it isn't easy.
Critical stack-ups often compete with design deadlines, supplier issues, and manufacturing support. We provide dedicated execution capacity while your engineers retain design authority.
Backlogs slow releases
Important fit and clearance checks remain unfinished because internal engineers are focused on other priorities.
Revisions multiply the work
Every component, drawing, or supplier change can trigger another round of analysis and documentation.
Spreadsheet knowledge is scattered
Workbooks, assumptions, and dimensional relationships can be difficult to review or maintain across teams.
What we take off your plate
From the first stack to every revision.
Select a single deliverable or let Rev4 manage an agreed portfolio of dimensional studies throughout the product lifecycle.
Independent stack review
Check existing calculations, dimensional chain completeness, assumptions, formulas, revision accuracy and proposed corrections.
Stack-up development
Dimensional chain definition, assumptions, worst-case and RSS studies, sensitivity review, and clear analysis reports.
Drawing & revision updates
Identify affected studies when dimensions or BOMs change, update analyses, and maintain revision history.
Supplier change evaluation
Assess alternate components, manufacturing variation, and potential impacts on assembly fit or functional clearance.
Design insight & recommendations
Highlight contributing dimensions and help engineering teams evaluate adjustments before design release.
Review-ready documentation
Traceable source dimensions, stated assumptions, calculated results, and deliverables your team can review.
Existing workflow integration
Work from available drawings, BOMs, CAD references, and spreadsheets without requiring your organization to adopt a new application.
Three ways to engage
Start with a backlog. Scale to an ongoing service.
Three ways to work with Rev4—from reviewing calculations you already have, to clearing a project backlog, to maintaining your analysis across every design change.
Stack Review & Validation
Already have calculations? Get an independent technical review of the assumptions, chain and mathematical logic.
- Excel formulas, units and stack direction
- Missing dimensions or outdated revisions
- Method selection and GD&T interpretation
- Documented discrepancies and recommendations
Stack Backlog Sprint
A focused engagement for teams that need a defined set of tolerance studies completed or refreshed.
- Prioritized list of assemblies and stacks
- Agreed deliverables and assumptions
- Calculation and engineering review
- Findings and final handoff
Managed Tolerance Engineering
Rev4 becomes an extension of your engineering organization for recurring tolerance-analysis work.
- Dedicated analysis capacity
- New stacks and revision maintenance
- Supplier and engineering change support
- Regular workload and status reviews
Our approach
A straightforward handoff, with engineering control.
Rev4 proposes a documented process that fits your team's review, approval, and data-handling requirements.
Assess the workload
Review representative assemblies, drawings, stack worksheets, complexity and priorities.
Define the analysis
Agree on methods, functional requirements, deliverables, assumptions and review gates.
Execute & review
Perform calculations, check results, flag risks and collaborate with your design engineers.
Maintain the work
Update analyses as drawings, requirements and suppliers change, within agreed service scope.
Where it fits
Built for dimensional complexity and recurring change.
Ideal for product-development and sustaining teams with fit-critical assemblies and more tolerance work than internal capacity.
Medical devicesPrecision mechanisms, component qualification, sustaining design
Aerospace & defenseDrawing-driven hardware, supplier changes, assembly interfaces
Industrial equipmentMachine assemblies, motion systems, mechanical clearances
Automotive & mobilityDimensional studies, subassemblies, manufacturing changes
Human engineering judgment.
Software-enabled execution.
Rev4 uses Tolerance360 to support systematic stack analysis, documentation and revision workflows. You purchase the engineering result—not another license your team has to manage.
Common questions
Designed to work with your team.
Do we need to purchase Tolerance360?
No. The managed-service engagement is for engineering deliverables. Rev4 can use Tolerance360 internally while returning results in agreed formats.
Can we keep our existing Excel files?
Yes. Rev4 can use your spreadsheets and provide agreed Excel-compatible reports, subject to a review of templates and calculation requirements.
Who owns final engineering decisions?
Your designated engineering approvers retain product-design authority. Rev4 supplies analysis, assumptions, findings, and recommendations for your approval.
What if our product needs full 3D variation simulation?
We first determine the appropriate analysis method. More advanced 3D variation simulation, measurement-based studies, or other specialist tools may require separately scoped capabilities.
How are sensitive product documents handled?
Data exchange, permitted tools, access controls, retention, and confidentiality requirements are agreed before work begins. Customer-specific security procedures can be included in the engagement scope.
What does the free preliminary review include?
We screen one mutually agreed, reasonably scoped existing stack for evident calculation, assumption and dimension-chain issues, and provide a brief written observations summary. Detailed independent verification, recalculation, sign-off and remediation are separate paid scopes.
Let's discuss your workload
Have tolerance stacks waiting for attention?
Start with a description of your workload and the file types you use. For proprietary drawings or CAD, we’ll agree on an NDA and secure exchange before receiving files.