This machine continuously winds and cuts twisted pair for use in high-voltage (20kV breakdown) Oscilloscope isolation transformers.
Cut length is flexible, and winding pitch can be selected from eight settings, chosen from a set of four gear presets, and two speed settings on the rotating gear follower.
The cutting shears are connected to the drive motor by an electromechanical clutch, which is driven by a latching circuit comprising a relay, mechanical hair trigger, and latch-reset microswitch.
Upon triggering, a cam temporarily disengages the wire twister (twisting armature) by means of an idler pulley on the drive belt, preventing the wire from advancing and causing a jam until the shears have opened.
Parts were designed in OpenSCAD and 3D printed on an FDM printer.
Full machine documentation can be found below:
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