On Sunday 11 October 2009, Mark Cason wrote: > Gene, I see you and I have the same idea for a spindle brake, but, is >10 ohms enough?? I was originally thinking of a pair of 50 ohm 10 watt >resistors in parallel (since I already have them). I could always throw >another 1 or 2 on, to decrease the ohm's.
The heat generated is not sufficient to noticeably warm the 10 watt resistor I had at hand, and since it is a wire wound, unlike a carbon resistor the heat pulse has little effect on it in terms of long term life. A far at the pair of 50's is concerned, they will also stop it fairly quickly. Mine is maybe 2 or 3 turns from the full 2500 rpms, and some might call that a little brutal, but I have been doing it for at least a year with no ill effects that I have detected. A single 50 would probably be fast enough, and certainly easier on the PM fields of the motor. -- Cheers, Gene "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) The NRA is offering FREE Associate memberships to anyone who wants them. <https://www.nrahq.org/nrabonus/accept-membership.asp> You will be given a post of trust and responsibility. ------------------------------------------------------------------------------ Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
