Ferrofluid following the magnetized conical screw of a meat grinder

Ferrofluid is attracted by magnetic flux. It flows with the gradient.
A track with continuously increasing flux density is formed by a conical screw.
Such a high pitch, conical steel-screw is difficult to make. It is much easier to just take it form discarded equipment, like in this case from a meatgrinder.
A meatgrinder core is tested in the field of an adjustable DC Magnet. The flux lines emerging from track at the ridge of the thread shall be of increasing density from bottom to top.

To visualise the flux density on the track, identical steel spheres are attached at high flux. With decreasing flux they will fall down when at their location the flux density falls under the critical value. With continuously decreasing flux they shall fall down in sequence from bottom to top.
The handmade screw shows a suitable increasing line with some distortions.

The final test shows that the meatgrinder screw is capable to levitate the ferrofluid on the track at the ridge of the thread from the basin to its top. LINK, Via: Youtube

The Screw Asylum

If you're a screw admirer, an asylum admirer, a collection lover, a DIY nut, or generally strange, The Screw Asylum is for you.

All the patients are as they were when they were plucked from the box. They have not been medically treated or tortured for your curiosity and amusement in any way; that's not how we operate here. The only thing you may notice is the odd patch of rust or oxidation; this isn't through mistreatment on our part; it's just through their age.
LINK