Thank you for your responses, a search for "brake" definitely produced more results than I was getting before :-)
Kirk, I think you're right that I will have to design my own because the amount of space I have available behind the stepper is about 0.360" and it looks like the available brakes are considerably thicker than that. Thanks, DougM On Wed, Mar 10, 2010 at 9:47 AM, Kirk Wallace <kwall...@wallacecompany.com>wrote: > On Wed, 2010-03-10 at 09:11 -0800, doug metzler wrote: > > for a small stepper motor, like a NEMA 17 I need a small (DC) > electrically > > driven lock that I can attach to the shaft such that when the power is > > turned off the shaft is locked in place. > > > > Do any of you folks know of such a device? I've been googling around but > I > > haven't been able to come up with the proper combination of search terms > to > > get at exactly what I'm looking for. > > > > Thanks, > > My lathe has a Warner electric release brake: > http://www.wallacecompany.com/cnc_lathe/HNC/00061-1a.jpg > > I have noticed a smaller version on my radial arm saw. > > For your size, you may need to make your own. Basically, there is a > metal disk and a matching disk permanent magnet that provides friction > by fitting and pulling against the metal disk. One disk is mounted to > the motor shaft, the other is mounted to the frame, but some movement of > one of the disks along the shaft axis is allowed so that they may > release. At this point the brake is always on. A coil is added and > energized in a fashion that builds an opposite field to the permanent > magnet. With sufficient field, the electromagnet pulls the disks apart, > releasing the brake. In the Warner brake the magnet is also the > friction material. > > A search for "nema 17 electric release brake" got this link: > > http://news.thomasnet.com/news/mechanical-power-transmission/brakes-brake-accessories/electromagnetic-brakes > (Short URL) http://alturl.com/4pou > > There might be other search terms on this page, like "power off brake" > > Good luck. > > -- > Kirk Wallace > http://www.wallacecompany.com/machine_shop/ > http://www.wallacecompany.com/E45/index.html > California, USA > > > > ------------------------------------------------------------------------------ > Download Intel® Parallel Studio Eval > Try the new software tools for yourself. Speed compiling, find bugs > proactively, and fine-tune applications for parallel performance. > See why Intel Parallel Studio got high marks during beta. > http://p.sf.net/sfu/intel-sw-dev > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
