CompuServe Messages

Bullroar, Jez. Stepper motors all have the characteristic that if you pick the stepping pulse rate correctly, it will step practically noiselessly. Faster than this, it misses steps. Slower than this, it makes a Full Stop (or nearly so) in between each step, causing lots of vibration –>noise. Actually, there is a RANGE of stepping rates that are quiet to varying degrees. the 3 ms might be real fast, but the Amiga stepper motors show every sign that they could run faster. This is not surprising, since the 3-1/2" drives have small parts and therefore low inertia (compared to a 5-1/4" drive, where 6ms is considered hot stuff). Even my big old 8-inch dreadnoughts step (quietly) at 3 ms.