RE: [CAD_CAM_EDM_DRO] microstep accuracy was what comprises as step

What about the controllers that accept microstes but have a real servo on
the back end? What kind of accuracy can you attain with these?


|> Accuracy may be the wrong term here, but you would get finer steps of
|> positioning, correct? So if you were using feedback, let's say
|from a DRO
|> unit, couldn't we then achieve higher accuracy?
|
|Not necessarily. A stepper guarantees it will move when issued a half
|step, under almost all circumstances. Much finer than a half step, and
|there's no guarantee of any movement at all, and it most likely will not
|move a proportionate amount. If you have X10 microstepping, and you
|slowly click in steps, the motor may only move every 3 or 4 steps,
|erratically. If you use encoder feedback, without deadband, you
|guarantee hunting will occur. it might be rather innocuous, or it could
|cause a really annoying vibration.