How would you expect the feedrate to change? I mean your motors have to accelerate up to the rapid feedrate, it can't just jump from feedrate A to feedrate B without accelerating up or down. Your motors would loose steps otherwise if the software will not follow your acceleration settings and acceleration takes time, it does not happen in 0 time.
cncdrive wrote:How would you expect the feedrate to change?
I'd expect a rapid/feedrate-move junction to be exact stop I'd expect a feedrate-move/rapid junction to be exact stop I'd expect a rapid/rapid junction to be exact stop.
Well a couple of rapids navigating around a fixture could end in tears but that's not really the point. IMHO there are zero advantages to blending rapids in all three cases but several disadvantages so why do it?
However, I would think that the vast majority of people are using CV settings that would prevent that much deviation from the path? Typically much less than 1mm?
Not arguing with your point, just pointing out that UCCNC typically stays much closer to the commanded position then Mach3.