The CadNexa Blog

FAI and AS9102 guides, balloon drawing workflows, GD&T explainers and inspection checklists — written by engineers, for engineers.

GD&T Guide

Runout vs total runout: what each GD&T control actually catches

Circular runout vs total runout explained: symbols, tolerance zones, dial indicator and CMM measurement, which to specify, and common inspection mistakes.

Jul 9, 20268 min read
FAI & Standards

AS9102 Rev B vs Rev C: every change, form by form

What changed from AS9102 Rev B to Rev C: form-by-form field changes, the single-signature rule, DPD requirements, and a supplier transition checklist.

Jul 8, 20269 min read
GD&T

Profile of a surface, explained: GD&T's do-everything control

Learn profile of a surface in GD&T: bilateral and unilateral tolerance zones, all-around callouts, datums, and how to inspect profile on a CMM.

Jul 7, 202610 min read
Quality

Incoming inspection checklist: what to check before material hits your line

A practical incoming inspection checklist: documents, dimensional checks, AQL sampling and ISO 9001 records — plus a faster way to build your IQC sheet.

Jul 7, 20269 min read
FAI Reports

Delta FAI explained: when a partial first article inspection is required

Delta FAI vs full FAI under AS9102 Rev C: the seven triggers for a partial FAI, how to document affected characteristics, and a worked aerospace example.

Jul 6, 20268 min read
FAI / Aerospace

AS9102 Forms 1, 2 and 3 explained: a plain-English guide to the aerospace FAI package

AS9102 Forms 1, 2 and 3 explained in plain English: what each first article inspection form captures, Rev C changes, and how to fill them fast.

Jul 5, 20269 min read
Drawing Basics

How to read engineering drawings: a practical guide for the shop floor

Learn how to read engineering drawings: title block, views, dimensions, tolerances, surface finish and GD&T. A clear step-by-step guide for engineers.

Jul 4, 20269 min read
GD&T

GD&T bonus tolerance and MMC, explained with worked examples

GD&T bonus tolerance under MMC explained with worked hole-and-pin examples: read the feature control frame, know when bonus applies, and inspect it right.

Jul 3, 20269 min read
3D Viewer

Measure a STEP file online: exact distances, diameters and angles in the browser

Measure a STEP file online free in your browser: point-to-point distance, hole diameter, edge length and angle from exact 3D geometry, no CAD install.

Jul 2, 20268 min read
GD&T

The GD&T datum reference frame, explained: the 3-2-1 rule in plain English

Understand the GD&T datum reference frame: how primary, secondary and tertiary datums and the 3-2-1 rule lock all six degrees of freedom on a part.

Jul 2, 20269 min read
Buyer's Guide

SolidWorks Inspection alternative: a free, browser-based balloon tool

A SolidWorks Inspection alternative: how CadNexa, a free browser-based auto-ballooning and FAI tool, compares on price, setup and CAD licensing.

Jul 1, 20267 min read
3D Viewer

Exploded view online: open a STEP assembly and pull it apart in your browser

See how to make an exploded view online from a STEP assembly in your browser — separate every part, read the BOM, and share it, with no CAD install.

Jul 1, 20268 min read
Quality / Inspection

What is ballooning a drawing? Meaning, purpose, and how to do it

What does ballooning a drawing mean? A plain guide to drawing ballooning for FAI and PPAP: how to number every characteristic and balloon a PDF fast.

Jun 30, 20268 min read
FAI / Quality

Free FAI report template: AS9102 Forms 1, 2 and 3

Download a free FAI report template for AS9102 Forms 1, 2 and 3. See what each field needs, plus a faster way to balloon and generate it online.

Jun 30, 20268 min read
3D Viewer

STEP file viewer online: open and inspect a .step file in your browser

Open STEP and STP files online free in your browser, no install. Rotate 3D models, measure, explode assemblies and auto-generate a BOM with CadNexa.

Jun 29, 20268 min read
CAD Formats

STEP vs IGES: which CAD file format should you actually use?

STEP vs IGES explained for engineers: the real differences, when to use each CAD format, and how to open both .step and .igs files free in your browser.

Jun 28, 20269 min read
Quality Systems

ISO 9001 inspection documentation: the records that pass an audit

What inspection documentation ISO 9001 requires under clauses 8.6 and 7.5, the five records auditors ask for, and how to keep them audit-ready.

Jun 28, 20268 min read
Balloon Tool

How to balloon a drawing in Excel (and a faster free way)

How to balloon a drawing in Excel step by step, with a free template, plus a faster online way to balloon PDFs and build the inspection sheet in minutes.

Jun 27, 20268 min read
3D Viewer

Free online IGES file viewer: how to open and inspect a .igs file in the browser

Open and view IGES (.igs/.iges) files online free in your browser. Rotate, measure and inspect 3D models with no CAD install. STEP and IGES supported.

Jun 26, 20268 min read
Buyer's Guide

Net-Inspect alternative: a free, browser-based balloon & FAI tool

Looking for a Net-Inspect alternative? See how CadNexa, a free browser-based auto-ballooning and AS9102 FAI tool, compares on price and install.

Jun 25, 20267 min read
Buyer's Guide

High QA alternative: a free, browser-based balloon & FAI tool

Looking for a High QA alternative? See how CadNexa, a free browser-based auto-ballooning and FAI tool, compares on price, install and fit for small shops.

Jun 23, 20267 min read
Quality / FAI

First article inspection checklist: the complete FAI guide for a clean first submission

A first article inspection checklist for AS9102 and PPAP: ballooning, dimensions, materials, sub-tier FAIs, and the exact line items auditors reject.

Jun 22, 20269 min read
Quality / ISO 13485

ISO 13485 inspection documentation: what an auditor actually wants to see

ISO 13485 inspection documentation guide: device history records, traceability to drawing revision, and turning a PDF drawing into audit-ready sheets.

Jun 21, 202610 min read
Procurement / RFQ

RFQ to vendor workflow: from drawing pack to awarded job, without the email chaos

A practical RFQ to vendor workflow: package drawings, share a secure expiring link, collect quotes side by side, and award the job with a full audit trail.

Jun 20, 20269 min read
Drawing Control

Drawing revision comparison: how to catch every change before it costs you

Compare two engineering drawing revisions and catch every changed dimension, tolerance and note — a reliable method plus a faster balloon-and-CSV workflow.

Jun 19, 20269 min read
3D Viewer

STEP file BOM export: how to get a bill of materials from an assembly online

Export a Bill of Materials from a STEP or IGES file online. CadNexa's 3D viewer auto-builds a BOM with part counts and weights, then CSV export.

Jun 18, 20268 min read
Quality / CMM

CMM inspection planning: a step-by-step guide from drawing to measurement program

A practical CMM inspection planning guide: build a measurement plan from a ballooned drawing, pick datums, sequence touches, and cut programming time.

Jun 17, 20269 min read
GD&T

The GD&T feature control frame, explained box by box

Read a GD&T feature control frame the right way: geometric symbol, tolerance zone, MMC modifier and datum reference order, with a worked example.

Jun 16, 20269 min read
Ballooning

How to balloon a PDF drawing online — free, in your browser

Balloon a PDF drawing online free: number every dimension, capture tolerances, and export a CSV inspection sheet in minutes — no install, runs in browser.

Jun 15, 20268 min read
Inspection Planning

How to convert a drawing into an inspection sheet — in minutes, not hours

Turn any PDF engineering drawing into a numbered inspection sheet: balloon each characteristic, capture tolerances and methods, then export to CSV or PDF.

Jun 14, 20268 min read
Quality Standards

PPAP levels 1 to 5 explained: what each submission actually needs

PPAP levels 1 to 5 explained simply: what each submission level requires, the 18 elements, and when a customer needs Level 3 versus Level 5.

Jun 13, 20268 min read
Buyer's Guide

InspectionXpert alternative: a free, browser-based balloon tool

Looking for an InspectionXpert alternative? See how CadNexa, a free browser-based auto-ballooning and FAI tool, compares on features, price and fit.

Jun 13, 20267 min read
Buyer's Guide

Best balloon drawing software in 2026: free and paid tools compared

Compare the best balloon drawing software for FAI in 2026 — free and paid tools, features, price, and which auto-ballooning option fits your shop.

Jun 13, 20268 min read
Guide

GD&T for shop floor engineers: the 14 symbols you actually use, with real examples

GD&T for machinists and inspectors: all 14 ASME Y14.5 symbols with machined-part examples, datum rules and common mistakes that fail inspection.

Jun 10, 20269 min read
Comparison

AS9102 vs PPAP: which First Article Inspection standard does your customer need?

AS9102 vs PPAP — when each standard applies, the 3 AS9102 forms, the 18 PPAP elements, and how to switch between them in your QA workflow.

Jun 10, 20267 min read
AI · Balloon Tool

AI auto-ballooning: how CadNexa detects 100+ dimensions on an engineering drawing in under a minute

How AI auto-ballooning detects every dimension, tolerance and GD&T frame on a drawing in under a minute — free browser balloon software for FAI.

Jun 10, 20268 min read
Guide

The complete manufacturing engineer's toolkit: free 3D viewer, exploded view, ballooning, and FAI reports — all in your browser

The complete CadNexa guide: balloon drawing software, STEP viewer with exploded view, BOM generator and AS9102 FAI reports — free in your browser.

Apr 15, 20268 min read
Balloon Tool

How to create FAI reports and balloon drawings in 10 minutes — with a free online tool

Create AS9102, PPAP and ISO first article inspection reports from ballooned PDF drawings in minutes. Free browser-based tool, no installation.

Apr 14, 20267 min read
CadNexa 3D

Free online STEP file viewer with BOM generator and weight calculator — no installation needed

Open STEP, IGES and STL files in your browser free. Auto-generate BOM, calculate part weight, and create quotations — no installation needed.

Apr 14, 20266 min read