FLY16 - firepick1/FireSlide GitHub Wiki

Flywheel for 16mm pulley (e.g., GT2 20T)

Function

3DP cylinder wound with two layers of dense wire (e.g., 16-18AWG copper wire) provides sufficient moment of inertia to act as a flywheel for dampening rough mid-range resonances that can cause step loss during start/stop phases of a stepper movement.

Moment of inertia about an axis is given as sum of mass times square of radius. Wire wound around a cylinder therefore provides maximum moment of inertia for the mass of the wire. The wire is wound in two separate layers, each fixed at its endpoints by embedding wire ends to provided holes in the flywheel. First layer of wire is wound clockwise and second layer counter-clockwise to keep layers from tangling with each other. Copper is recommended for density, but other wire may work as well.

Symmetrically opposed pair of M3 screws secure flywheel to 16mm pulley at any unobstructed surface (avoid threads of pulley set-screw holes).

Flywheel works best with NEMA14 stepper motors.

Requires

  • M3 screw with socket cap or M3 set screw (2)
  • M3 nut (2)
  • 1-1.3mm bare copper wire (about 150mm)

Assembly

Stepper drive pulleys can be mounted in either of two directions, but the flywheel can only be mounted on a pulley whose teeth are closest to the motor.

See Also