On Sunday 13 March 2016 07:40:25 John Thornton wrote: > 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
That would be considerably more usefull than the controllers default of 30 seconds. Do you recall the specs of the resistor you used? Thanks John. > 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 Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ 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
