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● Live now No credentials required ASME Y14.5-2018 Free on all plans

GD&T Compute
MCP Server

ASME Y14.5-2018 tolerance math inside Claude, ChatGPT, and Grok (respective accounts needed separately). Bonus tolerance, virtual condition, resultant condition, and worst-case stack-up — computed instantly, no external calls, first-party only.

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6 toolsBonus tol · virtual cond · resultant cond · stack-up · FCF parser · ASME check
AuthNone — no third-party account needed
ComputeFirst-party · no external calls · audited
StandardASME Y14.5-2018
Tool reference

All 6 GD&T tools

All tools are available on every ForgeMCP plan at no extra cost. No credentials required — pure compute, no external calls.

gdt_bonus_tol
Calculate bonus tolerance for a feature of size under MMC or LMC condition. Returns allowable tolerance zone expansion per ASME Y14.5-2018 §2.8.
gdt_virtual_cond
Compute virtual condition for external and internal features. Returns the worst-case boundary used for mating part design and gage design.
gdt_resultant_cond
Compute resultant condition — the worst-case boundary encompassing the combined effect of size tolerance and geometric tolerance.
gdt_stack_up
Worst-case and RSS tolerance stack-up analysis across a chain of dimensions. Returns min/max assembly condition with contributor breakdown.
gdt_parse_fcf
Parse a feature control frame string into structured data: characteristic symbol, tolerance value, material condition modifier, datum references.
gdt_asme_check
Validate a feature control frame or datum structure against ASME Y14.5-2018 rules. Returns compliance status and specific rule violations if any.
Quick start

Connect in 30 seconds

No credentials needed. Add your ForgeMCP integration URL in Claude's MCP settings and GD&T tools are immediately available.

# In Claude: Settings → Connectors → Add custom connector https://mcp.forgemcp.ai/your-workspace-slug # Example: ask Claude to check a feature control frame # "Calculate bonus tolerance for a 25mm shaft, # MMC ø25.05, LMC ø24.95, perpendicularity ⊕0.02 M"
Use cases

What engineers use it for

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Drawing review
Verify that feature control frames on a drawing comply with ASME Y14.5-2018 before releasing to manufacturing. Ask Claude to check each callout as you review.
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Tolerance stack-up
Run worst-case and RSS stack-up analysis on assembly chains during design. Get a full contributor breakdown without switching to a separate analysis tool.
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DFMEA and DFM
During DFMEA, use virtual and resultant condition calculations to identify which tolerance combinations create assembly risk or gage design challenges.
Learn more

How the math works

Bonus tolerance, virtual and resultant condition, and worst-case vs. RSS stack-up — the ASME Y14.5-2018 concepts explained, mapped to these six tools.

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Independent product · non-endorsement

ForgeMCP and GD&T Compute are independent products of All Aligned Consulting LLC and are not affiliated with, sponsored by, or endorsed by ASME. References to ASME Y14.5-2018 are for identification and interoperability only. GD&T Compute assists engineering review and is not a substitute for professional engineering judgment or qualified human verification.