This is the case with me as well - when one of the interlocks is opened I lose power and the z axis can drop into the work. I don't actually have to maintain the exact position so a small amount of movement is tolerable, so long as the thing doesn't run away - this would allow for a less sophisticated mechanism, and given how small the stepper is it doesn't have to be that robust, but I was hoping for something off-the-shelf.
I did try shorting the stepper leads together but fully loaded the Z axis is sufficiently heavy to cause the stepper to creep. Thanks for your continued thoughts. DougM On Wed, Mar 10, 2010 at 1:50 PM, Dave <e...@dc9.tzo.com> wrote: > True, but usually brakes are only applied to keep things from sliding > out of position when power is lost. > > If you have power to the stepper motor, it should not require a brake. > > For instance I have a brake on my X axis on my slant back lathe so when > power is lost the turret doesn't slide down into the workpiece. > > Dave > > On 3/10/2010 3:02 PM, yann wrote: > > Le mercredi 10 mars 2010 20:42:26, Dave a écrit : > > > >> You could also just drop a solenoid plunger into sprocket teeth or > >> something similar. > >> > >> Sort of like throwing the proverbial wrench into the works... ;-) > >> > >> Nema 17 is pretty small stuff. > >> > >> Dave > >> > >> > > problem with that is you will stop only at position determined by the > number > > of theeth... > > > > > > this is the device I was thinking about > > > > http://www.precisionroller.com/find/4402235600.htm > > > > this one looks very expesive, but you could get some used for free asking > your > > local photocopier dealer/repair shop. > > > > > ------------------------------------------------------------------------------ > > 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 > ------------------------------------------------------------------------------ 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
