It’s driven with a stepper motor which can test out combinations so fast that [Startup Chuck] needed to take 240 fps video and slow it down to make sure that the mechanism was behaving properly.

but [Jeremy]’s DIY Tubular Linear Motor is a really neat variety of stepper motor in a format we certainly don’t see every day. It started as a design experiment in making a DIY reduced noise ...

2 School of Power and Energy, Nanchang Hangkong University, Nanchang, China. This paper investigates the dynamic characteristics of hollow shaft rotor systems using a higher-order shear deformation ...