On May 19, 2012, at 6:55 PM, Jon Elson wrote: >> I seem to have the damping turned all the way up on my Gecko 320, but it is >> still underdamped. >> >> Is it possible to increase damping with the PID settings (I am using the >> Pico Systems USC board)? >> >> Would gearing down my drive further help with damping if I it is not >> possible to increase it any other way? >> > Are you sure it is the G320 that is underdamped, or the whole system > response, > including LinuxCNC? Some amount of additional D in the PID should damp > it further, maybe. But, maybe you just need to turn down the gain on > the G320 > and let LinuxCNC handle more of the gain.
Hi Jon, Well lets just say the only thing that I am sure about is the drive is under-damped. ;) Tuning is proving to be insanely difficult for me, I guess mostly because I don't really have much of a clue what I am doing. It is also kind of scary because if I turn a POT on the Gecko just a tad in the wrong way the drive violently rattles the whole table. When it was just the Gecko, that was something I had a grip on. But now it is a combination of the Gecko and the PID settings. It may be that I am just trying to accelerate the drive faster than the system can adequately damp it. This gantry is probably close to 200 pounds, and I just don't know how fast I can expect to be able to accelerate it. Does gearing a drive help with this? I seems in my mind it should. Gearing it down further would give me increased torque and resolution so seems like a win win. In the meantime, I will try turning the gain POT down and the D up? Best, Jeshua Lacock Founder/Engineer 3DTOPO Incorporated <http://3DTOPO.com> Phone: 208.462.4171 ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
