On 10/1/2010 4:20 AM, [email protected] 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. > > http://cgi.ebay.com/64-MAGNETS-4x4x4-1-4-neodymium-cubes-N42-STRONG-/250701995449 > > Looks good, if you are in the US (oddly there seem to be lots more on > ebay.co.uk) > >> > >> > I always assumed that detents were a spring loaded ball into a >> > depression in the wheel. > As have I, but those might wear.
Gentle persons: While not as conveniently shaped, the magnets used in modern disk drives for the heading tracking servo are seriously strong---and doesn't everyone have a dead disk drive or two to take apart? A quick search on "disk drive magnet" will get you plenty of info. (As an aside, I've saved a bunch of magnets and platters with the thought (not original to me) of making a eddy-current brake for measuring motor torque.) The drive motors are things of beauty just crying out to be re-purposed as well. Another source of small, strong magnets is the replaceable head of my wife's Philips Sonicare electric toothbrush. The head gets replaced every few months and I cut off the magnet for my box of stuff for the grandkids. Happy experimenting. Regards, Kent ------------------------------------------------------------------------------ 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
