⚡ Key Takeaways
- New disc built with alternating N-S-N-S magnets around the circumference
- A 6" stabilizer disc prevents the alternating poles from latching into a locked position
- Result: very smooth spin — one of the best Papa Bale has achieved
- Plans for 6-on-3-off and 9-on-8-off patterns using a 72-magnet (5° spacing) base grid
- Double helix disc column concept introduced — helical magnet stacking for distributed interaction
- Magnetic gear ideas discussed — using alternating polarity discs to transmit torque magnetically
Papa Bale introduces a new disc design that breaks from the uniform-polarity approach: alternating north-south-north-south magnets around the entire circumference. The result is a more complex magnetic field pattern — and, once the latching problem is solved with a stabilizer, one of the smoothest spins he's recorded.
The Alternating Polarity Disc
Where most of Papa Bale's earlier discs use uniform polarity — all magnets facing north up or all facing south up — this new disc alternates. Every magnet is flipped relative to its neighbor, creating an N-S-N-S-N-S pattern around the disc. This fundamentally changes how the disc interacts with adjacent discs and coils.
Instead of a single unified repulsive or attractive force, the alternating pattern creates a field that oscillates in polarity around the circumference. Coils placed near this disc see a field that reverses direction with every magnet — which is ideal for AC induction. And adjacent discs experience alternating push-pull interactions rather than a constant push or pull.
Preventing Latching with a 6" Stabilizer
The challenge with alternating polarity is latching. When two discs with alternating N-S patterns face each other, they can find rotational positions where north on one disc aligns with south on the other — creating a strong attractive lock that resists rotation. The disc wants to snap into this position and stay there.
Papa Bale's solution: a 6" stabilizer disc. By introducing an appropriately sized intermediate disc, the geometry of the magnetic interactions changes enough to prevent the N-S patterns from finding their preferred lock position. With the stabilizer in place, the disc spins freely — and the spin quality is noticeably better than previous setups.
Planning 72-Magnet Layouts (5° Spacing)
72 magnets evenly distributed around a disc gives exactly one magnet per 5 degrees of arc. This ultra-fine grid becomes the foundation for Papa Bale's planned on/off patterns:
- 6-on-3-off: Groups of 6 active magnets with 3-magnet gaps between groups
- 9-on-8-off: Larger active groups with slightly smaller gaps — a different duty cycle
These patterns allow precise control over how much of the disc circumference is "magnetically active" at any moment. Different duty cycles produce different torque profiles, cogging characteristics, and interaction patterns with adjacent discs or coils.
Double Helix Column and Magnetic Gears
Two forward-looking concepts get their first mention here. The double helix disc column arranges stacked discs so their magnets form a helical pattern up the pole — like a DNA double helix in 3D. This distributes magnetic interactions across the full column height rather than concentrating them at discrete horizontal planes, potentially smoothing out the pulsation that comes from flat-stacked discs.
The magnetic gear concept uses the alternating polarity discs to transmit torque magnetically — no physical contact between gear faces. If two alternating-polarity discs face each other with a small gap, rotating one causes the other to rotate in the opposite direction through magnetic coupling. Papa Bale sees this as a frictionless transmission mechanism worth exploring.