Fab Shop Cones & Transition Layout

Flat pattern layout calculator for metal fabrication. Generate accurate truncated cone and square-to-round transition patterns instantly  built for layout on the burn table or the shop floor. Enter your dimensions and get a complete flat pattern with all the numbers you need to mark and cut.

What It Does

Truncated Cone Layout  concentric and eccentric (offset) cone frustums. Enter large diameter, small diameter, and height to get the flat pattern layout radius, inner radius, and sweep angle ready to mark on plate or program into your CNC.

Square-to-Round Transition Layout  rectangular or square opening transitioning to a circular opening. Outputs an 8-piece flat pattern (4 corner triangles + 4 side panels) with all dimensions needed for layout and cutting.

DXF Export  export flat patterns as DXF files for direct import into your CNC burn table software or CAD program.

Inches and Millimeters  toggle between imperial and metric units. All inputs and outputs switch instantly.

Works offline  no internet required in the shop. Install the app and go.

Pricing

$0.99 per year with a 3-day free trial  try it completely free before you commit.

Subscription is billed annually through Google Play. Cancel any time through your Google Play account settings. Free trial automatically converts to paid subscription unless cancelled before the trial ends.

Who It's For

Metal fabricators who lay out cones and transitions by hand or on a burn table

CNC operators who need DXF flat patterns to import directly into cutting software

Pipefitters, HVAC fabricators, and vessel builders needing accurate cone frustum patterns

Apprentices and students learning flat pattern development

Any shop that regularly makes hopper bottoms, reducers, hoppers, or duct transitions