On Fri, Oct 01, 2010 at 12:09:27AM +0100, Andy Pugh wrote: > On 30 September 2010 23:42, dave <[email protected]> wrote: > > > I suspect that is is going to take a pretty good magnet to be able to > > feel it but then again I've not tried it. > > I just did. Using a 3mm square rare-earth magnet stuck to the > clock-stand set very close to the teeth, a drill in the 3-jaw and a > gear on the drill. > > It worked well. A larger magnet would work better, but I think the > magnet has to be of the order of a tooth-pitch.
A mild steel pole piece can be made to concentrate the flux into a tooth width, allowing a larger (and possibly more powerful) magnet to be used. More importantly, one from the junk box might then do. Then there's Kent's post of a month ago, describing partial energising of a stepper motor's windings when using it for an MPG. (To greatly increase the output amplitude.) A side benefit of that is stronger detents. And their strength would be electronically adjustable. Erik ------------------------------------------------------------------------------ Start uncovering the many advantages of virtual appliances and start using them to simplify application deployment and accelerate your shift to cloud computing. http://p.sf.net/sfu/novell-sfdev2dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
