> ## Documentation Index
> Fetch the complete documentation index at: https://docs.cosmon.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Drawing Review

> Check a drawing against standards, house rules, and prior revisions before it goes out for approval or to a supplier.

## Overview

A drawing that looks complete can still have blank title-block fields, undimensioned features, or a tolerance that doesn't match the model. Catching these manually means reading every view, every dimension, and every note — and it's easy to miss one on a dense sheet.

Nexus reviews a drawing feature by feature against ASME Y14.5, ISO 128/8015, or your own house rules, and can also check it against a previous revision or an incoming supplier drawing. You get a structured issue list, not a redlined guess — each item with its location and what's wrong.

**Use the built-in Drawing Review workflow** for a standards and manufacturability pass in one step — see [Drawing Creation](/cad/drawing-creation#three-built-in-workflows) for how to launch it, or drive the checks below directly with a prompt.

## What Nexus can help with

* **Standards compliance** — Check every dimension, tolerance, and annotation against ASME Y14.5 or ISO 128/8015 conventions.
* **Completeness** — Flag undimensioned features, blank title-block fields, missing tolerances, and dangling leaders.
* **Model-to-drawing consistency** — Cross-check drawing dimensions against the native 3D model to catch a drawing that's gone stale.
* **Revision comparison** — Diff the current drawing against a previous revision and list exactly what changed.
* **Incoming drawing review** — Check a supplier or vendor drawing against your requirements: material, tolerance class, finish, and callouts.
* **House rules** — Apply your own review checklist — anything from "no dimensions on hidden lines" to "every hole must reference the drilling standard."

## Example prompts

<AccordionGroup>
  <Accordion icon="clipboard-check" title="Full standards compliance review">
    ```text theme={null}
    Review C:/Projects/Bracket/bracket_v3.SLDDRW against ASME Y14.5. List every issue: undimensioned features, missing tolerances, blank title-block fields, dangling or overlapping leaders, and any dimension placed on the wrong view. Prioritise by severity.
    ```
  </Accordion>

  <Accordion icon="code-compare" title="Compare against a previous revision">
    ```text theme={null}
    Compare the current drawing against C:/Projects/Bracket/bracket_v2.SLDDRW (Rev A). List every dimension, tolerance, and note that changed, and flag anything that changed without a corresponding revision table entry.
    ```
  </Accordion>

  <Accordion icon="magnifying-glass" title="Model-to-drawing consistency check">
    ```text theme={null}
    Check every dimension on this drawing against the current state of the model. Flag any dimension that doesn't match, any feature on the model with no corresponding dimension, and any drawing view marked out of date.
    ```
  </Accordion>

  <Accordion icon="truck-ramp-box" title="Review an incoming supplier drawing">
    ```text theme={null}
    Attach C:/Incoming/Supplier/valve_body_supplier.pdf. Check it against our requirements: material 316 stainless, all wetted surfaces Ra 1.6 or better, wall thickness minimum 3mm, and NPT thread callouts per ANSI B1.20.1. List anything that doesn't comply or isn't specified.
    ```
  </Accordion>

  <Accordion icon="list-check" title="Apply a custom house-rules checklist">
    ```text theme={null}
    Review this drawing against our house rules: (1) no dimensions on hidden lines, (2) every through-hole references a drill standard callout, (3) title block "Checked By" is never blank at release, (4) all critical-to-function dimensions are flagged with a note. Report pass/fail on each rule with locations for any failure.
    ```
  </Accordion>
</AccordionGroup>

## Tips for drawing review prompts

* **State the standard** — ASME and ISO differ on tolerance interpretation, projection convention, and annotation style. Say which one applies before asking for a compliance check.
* **Say what to compare against** — a blank standards check, a previous revision, or an incoming supplier spec each need a different comparison target. Be explicit about which one you want.
* **Ask for a structured issue list, not a summary** — request each finding with its location (view, dimension, or title-block field) and severity, so the list can be worked through directly.
* **Provide your house rules once, reuse them** — if you review drawings against the same checklist repeatedly, save it as a skill so you don't have to restate it every time.
* **Run it before release-critical gates** — use drawing review before sending a drawing to a supplier, submitting for approval, or gating a [part release](/cad/part-release).