High-Speed destruction : Hard-Disc platter warping
Hard-Disc platters are a conveniently sized source of aluminium discs. Diameter is 95mm, mass typically 23.2 grams
disconly_2.m1v (2.5MB) 1000 frames/sec
The distance between the starting position and the top of the pipe is about 175mm. It takes about 3ms to travel this distance, giving a speed of 58m/sec, or 210km/hour (130miles/hour)
3ms later, it hits the top
OK. now what happens when we put something in the way, like a lump of wood..
discwrapwood.m1v (1.6MB) 2000 frames/sec
Slight signs of movement..
500 microseconds later, the disc is wrapped around the wood.
This time, the hub from a hard disc is placed in the centre of the disc :
Although not actively held down, its high mass compared to the disc makes it act like
it was, and the disc warps round it.