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In one ms? Say you only had 8 bit analog resolution (so ~127 velocity steps per direction and velocity quantization error of 1 part in 256) Its low enough cost to make it not painful if the decision was made to switch to another control setup.Actually the analog output resolution does not have a very significant effect on position resolution of the feedback loop.Ĭonsider that with LinuxCNC and a standard 1 KHz servo loop, how far can you deviate from the velocity_command*Time Its low enough cost to make it not painful if the decision was made to switch to another control setup.Ĭonclusion, Mesa 7I76E + LinuxCNC is tipping the scales at the moment. (at the moment, I haven't worked out if feedforward requires a particular mode)Ĭonclusion, Mesa 7I76E + LinuxCNC is tipping the scales at the moment. (i'm aware my terminology is a bit pants but I'm still getting my head around it all)Īs to Step/Dir, Torque, Speed modes, again, I get the feeling I probably wont see much difference. I'm guessing having the PID loop closed via the DMM drive/motor, the processing will actually be quicker, & at the motors inherent resolution, vs PID loop via controller. Re the 7I83, the output is 13 bit which may include a sign, + factoring in small errors, which will limit the potential resolution. Ok I did some more digging, and saw some informative posts by I must confess what little I do know, is more likely to be dangerous (and posts often contradict each other) but I don't think the feedback loop via the controller will be an advantage to me. The Centroid obviously works out more expensive, I've also got a number of old PCs that would run Linux fine, so no extra costs there. Out of the two, can anyone give a comparison, is one obviously stronger than the other. Can anyone summarise the advantages of having this feedback, and re using DMM servos, do they work as intended with said feedback circuit? The above Mesa combo provides analogue feedback. (I've used Linux before, wouldn't go back to using it as my main OS but perfect for something like this)
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Users do start projects creating new ones but I guess being busy people, they stay in development, or are for personal use.Ĭompared to other combinations, there isn't the same video content showing setup and usage, although there is a strong forum community. There is a modded GUI (gmoccapy) but not with the polish of the Centroid. I see others purchase the small 7I73 for a pendent but I believe the two boards do include that connectivity. The above boards probably provide, and some, all the outputs I'd need.
#Centroid cnc software software
LinuxCNC (Look ahead functionality, step/dir/velocity/torque mode)Ĭost: (7I83 + 7I76E) - $280, open source software What do they mean by digitizing, is it still purely control, or does it encroach on some of what Aspire does?
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#Centroid cnc software pro
Looks like you need the pro version if you're serious but what does the digitizing version really offer (There's additional probing support). Slick GUI, simple to setup, and reports suggest smooth running. Another vs thread, bit boring I know but useful to get opinions from the more experienced.