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vxiaoyu18

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- TL;DR Summary
- Spiral tube torque calculation.

Want to let the steel ball move upwards at a uniform speed, how is the torque of the spiral tube calculated?

The parameters can be assumed by themselves.

**The spiral tube is fixed on the central shaft, the central shaft is mounted in the ball bearing, and the thrust F acts perpendicularly on the surface of the spiral tube.

**Parameters that may be needed: pi = π, Earth gravity coefficient = g, steel density = ρ, steel ball radius = r, bearing friction coefficient = u, steel central axis mass = M1, steel ball mass = M2, steel spiral tube mass = M3, spiral tube inclination = 45, steel spiral tube parameters: inner diameter = d, outer diameter = D, wall thickness = s, pitch = L, number of turns = n, height =H, helix diameter = D1, rotation outer diameter = D2, helix length = C.

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