Engineering Tools — Aidan Duggan

✏️SketchpadFreehand canvas

🔁Unit ConvertersLength, temp, torque, pressure, weight, speed, area, volume, energy

📏 Length

Convert to

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🌡️ Temperature

Convert to

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🔄 Torque

Convert to

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💨 Pressure

Convert to

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⚖️ Weight / Mass

Convert to

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⚡ Speed

Convert to

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▦ Area

Convert to

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🧊 Volume

Convert to

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🔋 Energy

Convert to

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⚙️CalculatorsMachining, battery, FPV, 3DP, torque, Ohm's law, thread pitch

Spindle RPM

Cutting Speed

Tool Diameter

Units

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Feed Rate

RPM

Flutes

Chip Load per Tooth

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Battery Energy

Capacity (mAh)

Voltage (V)

Current Draw (A) — optional

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FPV Motor

Motor KV

Battery Voltage (V)

Prop Pitch (in) — optional

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3D Print Estimate

Part Volume (cm³)

Infill %

Material Density (g/cm³)

Print Speed (mm/s)

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Torque & Power

Mode

RPM

Torque (N·m)

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Ohm's Law

Solve for

Voltage V (volts)

Current I (amps)

Resistance R (ohms)

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Thread Pitch ↔ TPI

Mode

Value

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🏗️Structural & MechanicalTolerance stack-up, fastener preload, beam/column, cross-section MOI

📐 Tolerance Stack-up

Add dimensions with bilateral tolerances. Worst-case gives maximum possible gap/interference; RSS is the statistically likely result.

Name Nominal +Tol −Tol

Add at least two dimensions to begin.

🔩 Fastener Preload & Torque-to-Tension

Torque → Clamp Load

Applied Torque (N·m)

Bolt Nominal Diameter (mm)

Nut Factor K

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Proof Load & Preload Target

Bolt Size

Grade

Preload % of Proof

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📊 Beam Deflection & Euler Buckling

Beam Deflection

Loading

Span L (mm)

Load (N or N/mm)

Elastic Modulus E (GPa)

Second Moment of Area I (mm⁴)

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Euler Column Buckling

Column Length L (mm)

End Condition

Elastic Modulus E (GPa)

Second Moment of Area I (mm⁴)

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📐 Cross-Section Second Moment of Area (I)

Solid Rectangle

Width b (mm)

Height h (mm)

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Hollow Rectangle / Box

Outer Width B (mm)

Outer Height H (mm)

Wall Thickness t (mm)

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Solid / Hollow Circular Tube

Outer Diameter D (mm)

Inner Diameter d (mm) — 0 for solid

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I-Beam / H-Section

Flange Width b (mm)

Total Height H (mm)

Flange Thickness tf (mm)

Web Thickness tw (mm)

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⚡ElectronicsResistor color code, voltage divider, RC time constant, LED, op-amp, wire gauge

🎨 Resistor Color Code

Bands → Resistance

Bands

5-band (precision)

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Resistance → Bands

Value (Ω, kΩ, MΩ — e.g. 4k7 or 4700)

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🔌 Signal & Circuit Tools

Voltage Divider

Input Voltage Vin (V)

R1 — top resistor (Ω)

R2 — bottom resistor (Ω)

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RC Time Constant

Resistance R (Ω)

Capacitance C

C Units

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LED Resistor

Supply Voltage Vs (V)

LED Forward Voltage Vf (V)

Desired Current If (mA)

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Op-Amp Gain

Configuration

R1 (Ω)

R2 / Rf (Ω)

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🔌 Wire Gauge Reference (AWG)

AWG	Diameter (mm)	Area (mm²)	Ω/m (Cu, 20°C)	Max Current — chassis	Max Current — bundle

📋Reference TablesTap & drill, materials, 3DP fitment

🔩 Tap & Drill Sizes

🔧 Material Properties

📐 3DP & CAD Fitment

🖼️Image EditorResize, crop, rotate, adjust, convert

🖼️

Drop an image here or click to select

JPG, PNG, GIF, WebP, BMP

Width (px)

Height (px)

Keep Aspect

Rotate

Flip

Brightness

Contrast

Saturation

Quality %

Format

📄PDF ToolsMerge, extract pages, rotate, convert to images

All PDF processing runs in your browser. Nothing is uploaded anywhere.

Merge PDFs

📎

Drop multiple PDFs or click — select as many as needed

Extract Pages

✂️

Drop a PDF or click to select

Pages (e.g. 1,3,5-8)

Rotate Pages

🔄

Drop a PDF or click to select

Rotation

Pages (blank = all)

PDF → PNG (one per page)

🖼️

Drop a PDF or click to select

Scale (1=96dpi, 2=192dpi)