On Sat, 2008-01-12 at 23:55 +0000, Steve Blackmore wrote: > On Sat, 12 Jan 2008 17:19:24 -0500, you wrote: > > > >I'm not personally familiar with the KBIC drive, but I bet it is a > >non-regenerative drive. You will find it difficult or impossible to do > >a quick stop and reverse with it. A non-regen drive can only slow down > >by friction and drag, not by actively extracting power from the motor. > > Dunno - but It's little more sophisticated than your giving credit <G>. > > See > > http://www.kbelectronics.com/manuals/kbic.pdf > > It can have a shunt resistor wired into provided terminals for dynamic > braking and has an inbuilt inhibit which cuts power to the output during > braking.
In the manual, Figure 5B shows the braking option, which is a manual switch and relay. The switch activates the Inhibit and relays in the braking and disconnects the armature power. Steve, I got the impression that you have the same arrangement except you have two parallel port pins controlling a pair of relays. One to activate the Inhibit/braking- resistor/armature-disconnect and another to set the armature direction? Plus, there is an Inhibit delay somewhere in there? > It will stop remarkably quickly, and reverse, but I'm a belt and braces > man and I don't like burning the contacts on relatively expensive relays > ;) > > As for rigid tapping, as Kirk intends, it's quite capable of doing it, > as is ... Thank you for this information. I don't have a Sherline class machine, so, I have no practical feel for how these machines behave. > and it stops even quicker with a tap embedded in the work <G>. Maybe there's an EDM project in your future? > The fact that there's a delay before reversing is not detrimental. > > I don't "rigid" tap, but I routinely tap using an extending nose type > Tapmatic SM4, it works fine. > > Steve Blackmore What do you use for an automated gear change, tool changer, oiler, parts catcher... -- Kirk Wallace (California, USA http://www.wallacecompany.com/machine_shop/ Hardinge HNC lathe, Bridgeport mill conversion, doing XY now, Zubal lathe conversion pending) ------------------------------------------------------------------------- Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
