Igor Chudov wrote: > I have been using the mill, today, for making a part where most of the > time was spent engraving small text. Due to low setting of > acceleration (which I picked out of abundance of caution), the mill > could not reach the desired speed when engraving those letters. > > So, for a big Bridgeport Interact mill, what kind of acceleration for > X and Y are possible? > Depends on your servo amps, motors, etc. You can actually measure it, using EMC. What you can do is incrementally up the MAX_ACCELERATION values in the .ini file, and have following error showing in HalScope. As you raise the acceleration, you may see error peaks during the acceleration/deceleration part of moves. Adding a little FF2 may help damp these down. (Note it is real easy to overshoot with FF2 and start making the error worse.) When you can't increase acceleration any more without serious spikes in the following error, you are probably maxing out your servo amps. If the current limit on the amps is set as high as you think prudent, that is your limit.
I am using 3 in/sec^2 accleration on my Bridgeport, but I have puny servo amps and motors. If I increase it, it starts breaking timing belts, because they are only 3/8" wide belts. (This drive system came from a machine with a much lighter axis setup.) I have no idea what values other people are using, but I'm sure you can go higher than 3. Jon ------------------------------------------------------------------------------ Sell apps to millions through the Intel(R) Atom(Tm) Developer Program Be part of this innovative community and reach millions of netbook users worldwide. Take advantage of special opportunities to increase revenue and speed time-to-market. Join now, and jumpstart your future. http://p.sf.net/sfu/intel-atom-d2d _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
