Sorry I sent this only to Mr.Padnos by mistake So here... On Wed Jul 22 18:03 , Terry <[email protected]> sent:
> >Stephen, > >>These specs don't say what the "dirsetup" and "dirhold" times should be, > > >I looked a little deeper and found this: > >10 microseconds direction to step delay? > > >>Out of curiosity, do you have the Ah-ha PC plug-in card? > >Yes,it is an If-16 ? >Artisian software,12amp drivers. >Would you like to poke and prod around at the card and see >what makes it tick?You can have at it. > >It was one of the last kits they put out,was new in 2005 >I have no problems with the setup but the GUI needs to be more >user friendly.I am selling this machine to a non-cnc programmer >friend and I dont want to answering his questions all the time. >(Well not GUI related questions anyway) > >Thanks > >Terry > > > >On Wed Jul 22 15:27 , Stephen Wille Padnos [email protected]> sent: > >>Terry wrote: >> >>>Hi >>> >>>I have a Bridgeport Boss 5 retrofitted with an Ah-Ah system (stepper) >>>and I am going to keep the drivers and change out the software with >>>EMC (still using steppers). >>>I am a servo person so be kind when answering the following two >>>questions. >>> >>>1. Is there an advantage to using a board from mesa vs parallel port? >>> >>> >>Software stepping through the parallel port can come close to the >>maximum the drivers can handle. A Mesa card will definitely be able to >>reach the maximum the Ah-ha drivers can do, and much more if you decide >>to upgrade later (to faster stepper drives or to servos). >> >>Out of curiosity, do you have the Ah-ha PC plug-in card? >> >>>2. What do these numbers mean in the EMC world?: >>> >>>6 us minimum step pulse width >>> >>> >>This means that steplen needs to be 6000 or higher (that's 6 >>microseconds, expressed in nanoseconds) >> >>>15 us off time >>> >>> >>This probably means that stepspace needs to be 15000 or higher. >> >>>capable of 45,000 steps per second >>> >>> >>You will need to set your velocity limit such that 45000 steps/sec is >>not exceeded. So if you have 10000 steps/inch, you will need to set the >>velocity limit to 4.5 IPS. This will need to be lower if you need to >>use backlash compensation, since the backlash accel is added to the >>trajectory planner accel. >> >>These specs don't say what the "dirsetup" and "dirhold" times should be, >>so I'd set them to the same as stepspace, 15000, to be safe. These are >>the times to wait after changing the direction output and before issuing >>a step, and after issuing a step before changing direction. >> >>Hope this helps >>- Steve >> > > >---- Msg sent via CableONE.net MyMail - http://www.cableone.net ---- Msg sent via CableONE.net MyMail - http://www.cableone.net ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
