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⚙️ Bend Allowance Calculator

Professional Sheet Metal Unfolding · K‑Factor, Cone, Cylinder · Metric/Imperial · Export PNG/PDF

Unit System:
✨ Flat Length ✨
-- mm
Bend Deduction: -- mm
※ Formula: L = A + B - 2·(T+R)·tan(θ/2) + (θ·π/180)·(R + K·T)

📐 Bend Sketch & Flat Length Indicator

Adaptive scaling | Export includes all parameters & graphics
📐 Sector Development
--
Large radius: -- mm   Small radius: -- mm
Central angle: -- °
※ Radial line method for frustum. Inner/outer arcs correspond to perimeters.

🌀 Sector Flat Pattern (Frustum)

Sector automatically scales to fit canvas
📄 Rectangle Blank Size
-- × -- mm
Area ≈ -- cm²
※ Blank length = π × D, width = cylinder height.

📄 Rectangle Development (Rolling Blank)

Automatically centered & scaled

📘 How to Use ▼

1. Bend Unfolding (K-Factor)
Enter thickness, inside radius, bend angle, leg lengths, and K-factor (steel 0.44, aluminum 0.5, stainless 0.4). The flat length appears instantly. The sketch shows the bent shape and a bar representing relative flat length.

2. Cone / Truncated Cone
Input top radius, bottom radius, and height. If radii are equal, it switches to cylinder rectangle. Results show sector radii and central angle, plus a scaled drawing.

3. Cylinder Shell
Enter diameter and length. The rectangle blank (length = π×D, width = height) is displayed with area.

Unit Switch: Top bar lets you toggle between Metric (mm) and Imperial (inch). All inputs and results convert automatically.
Export: “Save as PNG” captures the current panel with margins; “Export PDF” generates a complete report.
Adaptive Drawing: Shapes always fit the canvas, scaled up/down as needed.

All calculations follow industry-standard formulas. Always verify with physical tests before production.

🤝 Trusted Partners Recommendation

Precision Manufacturing · Craftsmanship Excellence
📋 Company Profile One-Stop Solution
WAHI specializes in plastic injection molding, silicone rubber part production, and high-precision CNC machining. With a professional R&D team and a 3,000m² facility equipped with advanced injection molding machines, CNC centers, EDM, and CMM, WAHI provides integrated support from product development to mass production.
🎯 Core Business
Injection MoldingSilicone Rubber PartsCNC MachiningMold Design & ManufacturingRapid PrototypingAutomotive & Medical Components
60+
Advanced Machines
50
CNC Units
3,000m²
Facility
📧 info@wahimold.com  |👤 Max Huang
🌐 Visit Website →Get a Quote
📋 Company Profile Shenzhen Based
Shenzhen Huateng Zhenye Industrial Co., Ltd. is a professional custom precision machining parts manufacturer. Since 2016, specialized in CNC turning, milling, Swiss-style lathe. Advanced inspection equipment including Zeiss CMM and Mitutoyo CMM ensures micron-level accuracy for complex geometries and high-volume production.
🛠️ CNC Service Matrix
CNC MillingCNC TurningSwiss‑Style LatheWire Cutting5‑Axis MachiningRapid PrototypingVolume Production
Zeiss·Mitutoyo
CMM Inspection
±0.005mm
Tolerance
2016
Founded
📧 anna@huatengcnc.com  |👤 Anna
🌐 Visit Website →Request a Quote
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