I just finished assembling my new Lynx6 kit. I think I may have a problem with the “elbow” servo. It seems barely able to support the weight of the forearm and gripper, even with the supplemental springs. It also does not seem to be responding to the controller properly. When watching the RIOS Motions screen, the arm position does not match the simulated arm, and when running some of the sample programs, it has a tendency to want to plunge down too far (I stop it, of course, before it does go to far). Also, when running the All=1500 test, the elbow appears to be angling down 30deg instead of up. I thought maybe I had installed the servo or arm backwards, but after trying it both ways, it seems more correct this way. I suppose my question is what other troubleshooting can I try before calling in for a replacement servo?
Please go back to the beginning and follow the tutorials step by step. Tell us at what point the arm is not doing what the tutorial says it should be. You then tell us, in this tutorial, on this step, this is happening… It’s really the best way to troubleshoot problems. I think you may have missed clicking “reverse” on the setup for a channel…
I went back through all the assembly guides and general tutorials again. I also read through the user guide and performed the servo calibration (which I admit, I had neglected before) using the RIOS application. The elbow was still hitting the “bottom” (far back position) before it could get horizontal, or for the forearm to be aligned straight with the upper arm.
What I ended up doing to correct this was to remove the horn from the servo and rotate it about 45deg counter-clockwise. This gave me better range of motion for that joint, and allowed me to complete the calibration fully. When I hit the All=1500 button, it still doesn’t look like the elbow joint is quite 30deg above horizontal to my eye, but that’s probably just me. At least right now, it is not angling downward.
Thanks for the help, and next time I shall read the fine manual more carefully.
