CADCOLABS / FIELD REFERENCE
Practical geometry before it becomes shop time.
Free CAD tools and engineering reference for drafting, fabrication, machining, and construction coordination. Built to make preliminary work clearer, not to replace judgment, local requirements, or a licensed professional.
Browse the tool catalogFEATURED CAD APPLICATION
Design a spiral stair in 3D.
Adjust stair geometry, run preliminary FBC checks, generate the model, and inspect it directly in your browser.
Launch Spiral Designer
CONFIGURATORS / TOOLS / CALCULATORS
WORKSPACE POLICY
Results will be preliminary by design.
Each tool states its formulas, assumptions, units, and limits beside its result. None claims code compliance, file conversion, or professional approval.
Pinned & recent tools
Open a calculator to build browser-local history. Nothing is sent off this device.