On my GS-2 with the braking resistor I go from 1800 fwd to 1800 rev in 1 second. I have both acceleration and deceleration set to 1/2 second.
JT On 3/12/2016 10:12 PM, Gene Heskett wrote: > Greetings everybody; > > Given that I note the vfd's seem to have an adjustable accelleration > control, and that my couple of hours playing with it from its own front > panel, I am led at ask the question of just how fast can one of these > things be reversed from say 1000 rpm at the motor spindle? > > I ask because my present setup, using the OEM PM DC motor which is all > gear drive to the spindle, one of Jons pwm servo amplifiers and a 125 > volt dc supply, reversals at the turn around depth of this cycle of a > peck tapping operation, with the spindle doing 300 rpms, is a very small > fraction of a second, far less than 30 degrees of rotation. Based on > its reversal performance at 2500 rpms being a slim second, I am > concerned that the vfd may not be able to reverse so quickly, and will > impact my use of G33.1 because of the turnaround over shoots. On my > lathe, with its fragile drive train and a 5" chuck, this overshoot is > between 2 and 3 turns at 250 running rpms. Usable, but if I don't stop > it soon enough, the tap may bottom out and break. > > What has been the experience of others using smaller vfd's and motors? > > Can you still do rigid tapping safely? > > Thanks all. > > Cheers, Gene Heskett ------------------------------------------------------------------------------ Transform Data into Opportunity. Accelerate data analysis in your applications with Intel Data Analytics Acceleration Library. Click to learn more. http://pubads.g.doubleclick.net/gampad/clk?id=278785111&iu=/4140 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
