On Wednesday 24 June 2015 14:46:10 Scott Salrin wrote: > Len, > > You know, being a proud owner of one of your rotary machines, that > I am as interested in this answer as you are. Everyone tell me if I'm > wrong, but won't the feed rate also depend on the distance from the > center of rotation as well. I mean the surscae of a 3" diameter will > spin faster than a 1" diameter, right?
While that is true for a linear axis, or a spindle where you probably want CSS, I always setup a 4th axis as angular, in which case its degrees per unit of time. While I can with my puny setup, move faster than 720 degrees a minute if I have air into the table to lift it off the mating surfaces so it turns more freely, if I don't air it up, even 720 can be iffy, in danger of a stall. One of my future projects is to rig a tire inflator and write some hal code that will turn on the air, and with hold the move for a second or so to get up pressure, do the move, and shut the tire inflator off at the end of the move, hopefully bringing in enough friction that I can climb cut a sproket without using up the backlash in the table. Last time I did that, it was in alu, and the backlash gave me teeth gullets about 2 thou narrower than the chain roller, so it took a stroke or 3 of a file, and some run in time to make it fit well. For your check, make sure the 4th axis is set to angular as the first thing to check in the .ini file. > Honestly, I haven't had a ton of time to explore this yet, but > there isn't a lot of information available. I'm dying to see how this > one comes out, and for you to upload a post processor for me :) > > Scott > > On Wed, Jun 24, 2015 at 1:24 PM, Len Shelton <[email protected]> wrote: > > On a machine with a rotary A axis, if I run > > > > G91 A360 X10 F100 > > > > the machine moves 100IPM on the X and the A axis completes a 360 > > degree rotation at the same time. If I then run > > > > G91 A360 F100 > > > > the machines takes almost 2.5 minutes to complete the rotation, > > because it is only running 100 degrees per minute. > > > > So it seems that the feedrate of the linear axis overrides the > > feedrate of the angular units if a linear move is coordinated with > > it. Can someone confirm this? > > > > Also, this becomes a problem for a CAM program like Aspire when it > > has an angular move without a simultaneous linear move. I was > > wondering if anyone had run across this or if anyone had any > > thoughts. > > > > >Len > > > > -------------------------------------------------------------------- > >---------- Monitor 25 network devices or servers for free with > > OpManager! OpManager is web-based network management software that > > monitors network devices and physical & virtual servers, alerts via > > email & sms for fault. Monitor 25 devices for free with no > > restriction. Download now > > http://ad.doubleclick.net/ddm/clk/292181274;119417398;o > > _______________________________________________ > > Emc-users mailing list > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/emc-users > > ---------------------------------------------------------------------- >-------- Monitor 25 network devices or servers for free with OpManager! > OpManager is web-based network management software that monitors > network devices and physical & virtual servers, alerts via email & sms > for fault. Monitor 25 devices for free with no restriction. Download > now http://ad.doubleclick.net/ddm/clk/292181274;119417398;o > _______________________________________________ > Emc-users mailing list > [email protected] > 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> ------------------------------------------------------------------------------ Monitor 25 network devices or servers for free with OpManager! OpManager is web-based network management software that monitors network devices and physical & virtual servers, alerts via email & sms for fault. Monitor 25 devices for free with no restriction. Download now http://ad.doubleclick.net/ddm/clk/292181274;119417398;o _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
