📐 Sheet Metal Layout

Professional flat pattern development tools for pipe fitters and fabricators. Generate precise cutting templates with real-time 3D visualization. Print at 1:1 scale for workshop use.

🔧 Pipe Notching 🐟 Fish Mouth Cut 📐 Cylinder-Plane 🔄 Mitered Elbow 🔺 Straight Cone 🖨️ 1:1 Print
Sheet Metal Layout - Pipe Fabrication
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Flat Pattern Development Tools

Select a calculator to generate accurate cutting templates

Pipe Notching Calculator - Saddle Cut
🔧 Pipe Notch / Branch Connection
Perpendicular (90°) and oblique (0-60°) pipe-to-pipe intersections. Calculate fish mouth profiles for branch connections with optional lateral offset.
Saddle Cut 90° Oblique 0-60° Fish Mouth Template 3D Preview
BETA
Cylinder-Plane Intersection Calculator
📐 Cylinder-Plane Intersection
Visualize pipe cut by one or two oblique planes. See the Triouleyre formulas in action. Real-time flat pattern development with generator lines.
Single/Double Plane Triouleyre Formulas Flat Pattern 3D View
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Mitered Elbow Layout Calculator
🔧 Mitered Elbow (Segmented)
Segmented elbow construction with 2-40 sectors. Real-time 3D view with sector development. Supports 15°-360° angles for elbows and complete torus.
2-40 Sectors DN15-DN1200 15°-360° Angle 4 Languages
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Straight Cone Calculator
🔺 Straight Cone (Truncated)
Truncated cone flat pattern development. 3D visualization with real-time coordinate calculation. Supports offset and inclination.
FR/EN Bilingual DXF Export 1:1 Printing 3D Preview
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Square to Round Transition Calculator
🔷 Square to Round Transition
4-piece rectangular to round transition layout by triangulation. Real-time 3D view with flat pattern development for each quarter piece.
FR/EN Bilingual Triangulation DXF Export 3D Preview
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Conical Mitered Elbow Calculator
🔻 Conical Mitered Elbow (Reducing)
Reducing segmented elbow (conical lobster back) from one diameter to another, built with the inscribed-spheres construction. Exact fan-shaped flat pattern for every cone shell.
Inscribed Spheres DN15-DN1200 DXF Export 3D Preview
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Breeches Piece Y-Branch Calculator
👖 Breeches Piece (Y-Branch)
Equal-diameter cylindrical Y-piece (pant piece). Flat pattern templates for the trunk and both branches, with numbered generators and triple-point.
Equal Ø Y-Branch DN15-DN1200 DXF Export 3D Preview
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Twin Mitered Elbow Wye Calculator
👖 Twin Mitered Elbow Wye
Two mirror-image lobster-back elbows welded on the vertical plane over a common stub. Flat pattern for every segment plus the notched common body.
Mirrored Elbows Common Stub DXF Export 3D Preview
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Conical Breeches Two-Cone Wye Calculator
👖 Conical Breeches (Two-Cone Wye)
Cylindrical body with two conical branches built on a common inscribed sphere (Dandelin), so every joint is an exact plane curve. Fan-shaped branch patterns + roof-cut body.
Dandelin Sphere Exact Plane Joints DXF Export 3D Preview
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Conical Segmented Breeches Calculator
👖 Conical Segmented Breeches
Symmetrical wye made of two mirrored reducing mitered elbows on a common body. Inscribed-spheres construction, centre notch, fan pattern for every cone shell.
Reducing Wye Inscribed Spheres DXF Export 3D Preview
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Cylinder to Cone Intersection Layout
📐 Cylinder-Cone Intersection
Pipe piercing a cone of revolution at any angle and offset (Ifrah Pl. 63). Cone development plus the wrap-around tube template. 3D view, DXF/CSV export.
Ifrah Method Cone + Tube Pattern DXF / CSV 3D Preview
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Cone to Cone Intersection Layout
🔺 Cone-Cone Intersection
Two intersecting cones of revolution at any angle and offset (Ifrah Pl. 62). Both developments with the exact intersection curve. 3D view, DXF/CSV export.
Ifrah Method Both Developments DXF / CSV 3D Preview
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Section Transition Calculator
🔷 Section Transition (Any to Any)
Transition between any two sections (circle, ellipse, rectangle, polygon) lying in non-parallel planes. Tangent-plane method (Ifrah), true-length triangulation, 1:1 templates.
Any Shape Non-Parallel Triangulation DXF Export
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Screw Flight Development Calculator
🌀 Screw Flight Development
Screw conveyor (auger) builder: 3D screw + trough, dimensioned A-L drawing, flight flat-pattern with inner/outer arc lengths and cut slot. DXF, 1:1 print.
Flight Flat Pattern 3D Screw + Trough DXF Export 1:1 Print
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1:1 Scale Printing

Print cutting templates at actual size. Wrap around your pipe and cut directly. No scaling required.

Real-Time 3D

Interactive 3D visualization. Rotate, zoom, and inspect your cuts from any angle before fabrication.

Triouleyre Formulas

Based on classic sheet metal layout mathematics. View detailed formulas for each generator line.

25 Years Experience

Built by an industrial pipe fitter with real workshop experience. Designed for practical fabrication needs.

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