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True 3D tolerance analysis

Tolerance risk, made visible.

Reduce decision time, improve manufacturing yield, and identify cost-saving opportunities with GPU-accelerated Tolerance Analysis.

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Heat-map visualization of interference risk in a StackUp 3D assembly.

Industry context

Why tolerance analysis matters

Tolerance Analysis determines whether a product will assemble, function, and meet quality targets at scale. It also determines profitability. Yet in most engineering workflows, it remains a bottleneck.

When setup is slow and models are hard to keep aligned with real 3D geometry, teams run fewer studies—and important variation stays invisible until it is expensive to fix.

What's at stake

Every manufactured product depends on variation. Small geometric deviations accumulate across parts, impacting:

  • Assembly success and yield
  • Functional performance (fit, contact, alignment)
  • Manufacturing cost and scrap rates

Tolerance Analysis is how teams understand those effects before production. When the work stays slow and manual—rebuilding tolerances in spreadsheets, defining stack-up chains by hand, and maintaining parallel models as CAD evolves—complex assemblies can cost weeks or months per decision.

As a result:

  • Tolerance Analysis is applied late in the process
  • Only a small number of scenarios are evaluated
  • Design and manufacturing decisions are made with limited data

From bottleneck to design tool

Traditional Tolerance Analysis is slow to set up and difficult to scale. It often ends up as a final validation step.

That pushes exploration late, leaves margins and yield assumptions mostly untested during design, and forces tradeoffs with incomplete data.

Why StackUp 3D

Fast, accurate 3D scenarios—without the usual tradeoff

StackUp 3D performs tolerance analysis directly on 3D assemblies, shrinking time lost to spreadsheet reconstruction and helping engineers evaluate more scenarios per design cycle.

Breaking the speed–depth tradeoff

Many workflows force a compromise: quick checks in CAD with limited scenario depth, heavy model-based setup in the middle, or spreadsheet-style exploration that is slow to build and keep in sync with 3D. StackUp 3D targets the corner those paths rarely reach together—fast construction of accurate 3D scenarios with room to explore alternatives before tooling.

Move analysis earlier in the loop

StackUp 3D helps teams explore variation while geometry is still changing—test assumptions, iterate quickly, and evaluate more outcomes before tooling—so tolerance work supports design decisions instead of only signing off at the end.

Measurable outcomes

  1. Reduced Time to Decision. Move from weeks of setup to rapid scenario generation.
  2. Lower Manufacturing Cost. Optimize tolerances based on real tradeoffs, not assumptions.
  3. Improved Yield and Reliability. Identify worst-case conditions before production.
  4. Higher Engineering Throughput. Replace manual workflows with scalable computation.
  5. Stronger Product Performance. Link tolerance variation directly to simulation and validation.

Just say NO to spreadsheets for Tolerance Analysis

Spreadsheet-style tolerance analysis report with a red prohibition symbol over it, illustrating moving beyond spreadsheet-only stackups.

How it works

100X Faster Tolerance Analysis in 4 Steps

Import, group, detect, scan. Every step works on the geometry engineers already have.

01 Step Start from real geometry

Import STEP assemblies

Bring in STEP geometry and start from the actual assembly context instead of rebuilding dimensional relationships in a spreadsheet.

  • Use the assembly itself as the basis for analysis, not manual chain reconstruction.
  • Preserve the spatial context engineers already reason about in CAD.
StackUp 3D import workflow showing selected component groups in a mechanical assembly.
02 Step Scope studies in minutes

Select component groups

Define the groups you want to study so early-stage analyses stay focused on the mechanism, interface, or subassembly tied to the design question.

  • Target the parts that matter to the decision, not the entire product at once.
  • Grouping simplifies setup and keeps iteration fast as geometry changes.
StackUp 3D interface highlighting a selected component group on a cylindrical assembly.
03 Step Cut setup, not rigor

Detect contacts and mates automatically

Surface contacts are discovered from geometry, then reviewed to confirm which represent true mates. Setup becomes validation, not search.

  • Semi-automatic mate detection replaces manual surface hunting.
  • Engineers spend their time confirming intent, not clicking through assemblies.
StackUp 3D model showing selected contacting surfaces used for mate setup.
04 Step See where risk concentrates

Check every stack-up chain for collisions

Every pair of surfaces across every pair of groups is checked automatically, then rendered as a 3D heat-map that highlights the regions most at risk.

  • Collisions are found across all chains, not only the ones someone thought to inspect.
  • Heat-map visuals make reviews concrete and faster to align around.
StackUp 3D heat-map visualization showing interference risk on an assembly surface.

In the product

See it on real geometry

3D heat-map 3D result view
3D heat-map result showing interference risk concentration in StackUp 3D.

Heat-map view for design reviews

A 3D heat-map result shows exactly where interference risk concentrates and gives reviewers something concrete to discuss in the moment.

Imported STEP assembly with highlighted group in StackUp 3D.

Imported assembly context

The workflow starts from real assembly geometry so studies stay tied to the design as it actually exists today.

Selected component group in StackUp 3D.

Focused group selection

Selecting component groups keeps early analysis targeted when an engineer needs fast, directional learning.

Request a demo

See StackUp 3D on your assemblies

Request a demo to walk through the workflow on representative geometry and see where it fits alongside your existing tools.

Request a demo