On 10/24/2014 02:55 AM, andy pugh wrote: ... snip > And it might not be as simple as E-stop. (As an example, my Z axis is > a moving table. It drops when the power goes off. I wouldn't want that > to happen part way through a tool-change if I had a rack toolchanger, > so the correct response to a failed tool-release or loss of air would > not be to e-stop in that situation) ... snip
It sounds like you need one of these: http://www.warnerelectric.com/ers-series-brakes.asp My lathe has one for the spindle (top two pictures): http://www.wallacecompany.com/cnc_lathe/HNC/ As you probably know, servo motors are available with magnetic release brakes built in. The Tormach mills use them on the Z axis. If the power goes out, e-stop trips, or watchdog barks, the machine stops instantly. The magnetic engage clutches are handy too. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/ ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
