KC3LVG Fixed Coil Generator

Enter the target inductance in µH. The generator estimates turns, builds the same parametric coil former, and renders a printable STL with OpenSCAD.

Coil target

Target inductance (µH)

Former outside diameter (mm)

Turn pitch (mm)

Manual turns override (optional)

Calculated design

Turns—

Estimated L—

Winding height—

Body height—

Correction factor—

Calibration mode—

Turns	Estimated µH	Error from target

Mechanical parameters

End margin (mm)

Helix groove diameter (mm)

Wire passage diameter (mm)

90° passage bend radius (mm)

End hardware

Choose which end gets the hex coupling-nut pocket. The round shaft/stud hole is automatically placed on the opposite end.

Hex connector side

Hex connector preset

Hex across flats (mm)

Hex pocket depth (mm)

Shaft / stud preset

Round shaft/stud hole diameter (mm)

Round hole depth (mm)

Shaft/stud side

BottomOpposite the hex connector

Bench calibration

The default estimator now uses both measured 45 mm OD / 3 mm pitch coil pairs. Between 18 and 23 turns it interpolates the correction factor. Outside that range it clamps to the nearest measured factor. If you change diameter or pitch, Wheeler's formula provides the geometry scaling.

Turns	Measured pair (µH)	Average (µH)	Wheeler (µH)	Factor
Loading calibration…

Manual correction-factor override (optional)

Leave the override blank for the measured two-point model. Use an override only when you deliberately want one fixed multiplier for every turn count.

How the generator works

You enter the target inductance, former diameter and turn pitch.
The server tries each whole turn count and calculates a Wheeler single-layer estimate.
It applies the bench correction derived from the measured 18-turn and 23-turn coils.
It selects the whole turn count whose corrected estimate is closest to your target µH.
The selected turns, diameter, pitch and hardware choices are written into the parametric OpenSCAD master.
OpenSCAD renders the actual coil former and the server returns the STL.

The calibration improves the turn-count estimate, but it does not replace measuring the finished wound coil. Different wire, diameter, pitch and hardware can still shift inductance.

Ready.

Accuracy note

The target µH calculation is an estimate. The default model combines Wheeler's single-layer air-core formula with your measured 18-turn and 23-turn correction factors. Different diameters, wire, spacing, hardware and winding technique can shift the result. Measure each finished coil and add new measurements to future calibration updates.