Thread mill? Easy to have exact thread orientation that way.
------Original Mail------ From: "Bruce Layne" <[email protected]> To: "Enhanced Machine Controller (EMC)" <[email protected]> Sent: Fri, 22 May 2015 13:27:40 -0400 Subject: Re: [Emc-users] Fanuc Spindle Motor Encoder PPR Hey Chris, Nice video! Nice LinuxCNC VMC! I noticed that your spindle is indexed randomly at the start and end of each rigid tapping cycle. This verifies Andy's assertion that LinuxCNC only uses the index pulse to initiate rigid tapping and uses the other spindle encoder signals exclusively to match the Z travel to the spindle rotation. That works great for a fixture plate, but I'll be making parts where I need the threads to be indexed relative to the part geometry. In other words, I need all of the parts to screw on to mating parts and radially align in approximately the same position each time. That's seldom the case, but it is for me. That's why I need the spindle encoder on the spindle. As long as we understand the limitations, all is well. To a large extent, that's the difference between doing a LinuxCNC conversion yourself and using a more plug-and-play solution. It's like the difference between being a programmer/hacker as opposed to someone who uses a PC to update their Facebook status. Back on topic.... If I was Rick, I'd find SOME way to put an encoder on the spindle, even a low resolution encoder, and avoid patching LinuxCNC on the software side. I like to upgrade LinuxCNC when all of the great new features are added, and I don't like spending time to patch it each time to get it running again for my specific machine. I try to keep the machine as generic as possible, but that strategy flies in the face of fun projects like home brewed tool changers and other stuff I want to do. The best I can do is TRY to keep it simple. Bruce On 05/22/2015 11:37 AM, Chris Radek wrote: > On Fri, May 22, 2015 at 01:32:23PM +0100, andy pugh wrote: >> I believe that the cycle uses the index at most once per in-out move, >> so as long as you are not peck-tapping it will still work. > On my vmc, there is an untoothed belt drive between the spindle and > motor. The spindle encoder is on the motor. The encoder does not > have index. I don't know what the belt ratio is, exactly. I scaled > it by measuring, and jumpered A to Z on the mesa's input. So, it > gets indexes everywhere. > > Tapping works great. > > https://www.youtube.com/watch?v=9HLKXeWqTF0 > > I have never wanted to peck tap by cnc. > > ------------------------------------------------------------------------------ > One dashboard for servers and applications across Physical-Virtual-Cloud > Widest out-of-the-box monitoring support with 50+ applications > Performance metrics, stats and reports that give you Actionable Insights > Deep dive visibility with transaction tracing using APM Insight. > http://ad.doubleclick.net/ddm/clk/290420510;117567292;y > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > > ------------------------------------------------------------------------------ One dashboard for servers and applications across Physical-Virtual-Cloud Widest out-of-the-box monitoring support with 50+ applications Performance metrics, stats and reports that give you Actionable Insights Deep dive visibility with transaction tracing using APM Insight. http://ad.doubleclick.net/ddm/clk/290420510;117567292;y _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ One dashboard for servers and applications across Physical-Virtual-Cloud Widest out-of-the-box monitoring support with 50+ applications Performance metrics, stats and reports that give you Actionable Insights Deep dive visibility with transaction tracing using APM Insight. http://ad.doubleclick.net/ddm/clk/290420510;117567292;y _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
