Having completed the servo tuning, I have moved to the cutting and rapid profiles. The rapid profile is pretty straight forward, but in regards to the cutting one, I have a question... (probably still missing another concept) LOL
Doing some (metric) maths, I have approx 800 counts per mm of movement which obviously means 80 counts per .1mm and 8 counts for 0.01mm. For a large bed router, that is more than enough precision, so I'll be happy to keep my errors under 20 counts,
When I was checking the errors, I was doing it at about 75000 c/s and the errors were quite low, about 10 counts. I found that I could easily increase the velocity to 200000 c/s and the errors were still under 20 counts. Even at 300000 c/s the errors were relatively small. In the past, depending on the job, I typically would cut at under 140,000 c/s but with this machine I'm happy to cut faster if the results are adequate. However I'm sure there will be times when I can't cut at that speed and will be cutting much slower. Do I have just the one cutting profile, and if so, what happens when I cut slower? e.g I choose V 200000 as my cutting profile with 20 count errors. I then cut a job at 75000 c/s. (at 75000 c/s, errors are 10 counts). Am I likely to get 10 count errors? (this is theoretical, don't worry about all the other mechanical errors for this question). If that is the case, why not just set a cutting profile near to max velocity?